References

1. Singh, J.; Dutta, T.; Kim, K.-H.; Rawat, M.; Samddar, P.; Kumar, P. ‘Green’ synthesis of metals and their oxide nanoparticles: Applications for environmental remediation. J. Nanobiotechnol. 2018, 16, 1–24.
2. El Shafey, A.M. Green synthesis of metal and metal oxide nanoparticles from plant leaf extracts and their applications: A review. Green Process. Synth. 2020, 9, 304–339.
3. Jain, S.; Mehata, M.S. Medicinal Plant Leaf Extract and Pure Flavonoid Mediated Green Synthesis of Silver Nanoparticles and their Enhanced Antibacterial Property. Sci. Rep. 2017, 7, 1–13.
4. Kumar, K.M.; Mandal, B.K.; Kumar, K.S.; Reddy, P.S.; Sreedhar, B. Biobased green method to synthesise palladium and iron nanoparticles using Terminalia chebula aqueous extract. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2013, 102, 128–133.
5. Liu, C.; Kuang, Q.; Xie, Z.; Zheng, L. The effect of noble metal (Au, Pd and Pt) nanoparticles on the gas sensing performance of SnO2-based sensors: A case study on the high-index faceted SnO2octahedra. CrystEngComm 2015, 17, 6308–6313.
6. Devatha, C.P.; Thalla, A.K. Green Synthesis of Nanomaterials. Synth. Inorg. Nanomater. 2018, 169–184.
7. Sastry, M.; Ahmad, A.; Islam Khan, M.; Kumar, R. Biosynthesis of metal nanoparticles using fungi and actinomycete. Curr. Sci. 2003, 85, 162–170.
8. Benelli, G. Green Synthesis of Nanomaterials. Synth. Inorg. Nanomater. 2019, 9, 1275.
9. Pang, Y.L.; Lim, S.; Ong, H.C.; Chong, W.T. A critical review on the recent progress of synthesizing techniques and fabrication of TiO2-based nanotubes photocatalysts. Appl. Catal. A Gen. 2014, 481, 127–142.
10. Wu, Y.; Huang, Q.; Nie, J.; Liang, J.; Joshi, N.; Hayasaka, T.; Zhao, S.; Zhang, M.; Wang, X.; Lin, L. All-Carbon Based Flexible Humidity Sensor. J. Nanosci. Nanotechnol. 2019, 19, 5310–5316.
11. Joshi, N.; Shimizu, F.M.; Awan, I.T.; M’Peko, J.-C.; Mastelaro, V.R.; Oliveira, O.N.; Da Silva, L.F. Ozone sensing properties of nickel phthalocyanine:ZnO nanorod heterostructures. In Proceedings of the 2016 IEEE SENSORS, Orlando, FL, USA, 30 October–3 November 2016; pp. 1–3.
12. Wu, Y.; Joshi, N.; Zhao, S.; Long, H.; Zhou, L.; Ma, G.; Peng, B.; Oliveira, O.N., Jr.; Zettl, A.; Lin, L. NO2 gas sensors based on CVD tungsten diselenide monolayer. Appl. Surf. Sci. 2020, 529, 147110.
13. Joshi, N.; Hayasaka, T.; Liu, Y.; Liu, H.; Oliveira, O.N.; Lin, L. A review on chemiresistive room temperature gas sensors based on metal oxide nanostructures, graphene and 2D transition metal dichalcogenides. Microchim. Acta 2018, 185, 213.
14. Gaiardo, A.; Fabbri, B.; Giberti, A.; Guidi, V.; Bellutti, P.; Malagù, C.; Valt, M.; Pepponi, G.; Gherardi, S.; Zonta, G.; et al. ZnO and Au/ZnO thin films: Room-temperature chemoresistive properties for gas sensing applications. Sens. Actuators B Chem. 2016, 237, 1085–1094.
15. Liu, H.; Chu, Y.; Liu, Y.; Hayasaka, T.; Shao, Z.; Joshi, N.; Wang, X.; You, Z.; Lin, L. Label-Free AC Sensing by a Graphene Transistor for 100-ppb Formaldehyde in Air. In Proceedings of the 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS), Seoul, Korea, 27–31 January 2019; pp. 488–491.
16. Liu, H.; Liu, Y.; Chu, Y.; Hayasaka, T.; Joshi, N.; Cui, Y.; Wang, X.; You, Z.; Lin, L. AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift. Sens. Actuators B Chem. 2018, 263, 94–102.
17. Malik, R.; Tomer, V.K.; Joshi, N.; Chaudhary, V.; Lin, L. Nanosensors for Monitoring Indoor Pollution in Smart Cities; Elsevier: Amsterdam, The Netherlands, 2020; pp. 251–266.
18. Materon, E.M.; Ibáñez-Redín, G.; Joshi, N.; Gonçalves, D.; Oliveira, O.N.; Faria, R.C. Analytical Detection of Pesticides, Pollutants, and Pharmaceutical Waste in the Environment. In Nanosensors for Environment, Food and Agriculture Volume 1; Springer Science and Business Media LLC: Berlin/Heidelberg, Germany, 2020; pp. 87–129.
19. Joshi, N.; da Silva, L.F.; Jadhav, H.S.; Shimizu, F.M.; Suman, P.H.; M’Peko, J.-C.; Orlandi, M.O.; Gil Seo, J.; Mastelaro, V.R.; Oliveira, O.N. Yolk-shelled ZnCo2O4 microspheres: Surface properties and gas sensing application. Sens. Actuators B Chem. 2018, 257, 906–915.
20. Joshi, N.; Tomer, V.K.; Malik, R.; Nie, J. Recent Advances on UV-Enhanced Oxide Nanostructures Gas Sensors. Nanomater. Photocatal. Chem. 2020, 143–159.
21. Metzler, J.B. (Ed.) Functional Nanomaterials. In Nanomaterials and Photocatalysis in Chemistry; Springer Nature: Singapore, 2020.
22. Joshi, N.; Braunger, M.L.; Shimizu, F.M.; Riul, A.; Oliveira, O.N. Two-Dimensional Transition Metal Dichalcogenides for Gas Sensing Applications. Nanosens. Environ. Food Agric. 2020, 1, 131–155.
23. Malik, R.; Tomer, V.K.; Joshi, N.; Dankwort, T.; Lin, L.; Kienle, L. Au–TiO2-Loaded Cubic g-C3N4 Nanohybrids for Photocatalytic and Volatile Organic Amine Sensing Applications. ACS Appl. Mater. Interfaces 2018, 10, 34087–34097.
24. Kumar, A.; Joshi, N. Self-Powered Environmental Monitoring Gas Sensors: Piezoelectric and Triboelectric Approaches; Elsevier: Amsterdam, The Netherlands, 2021; pp. 463–489.
25. Materón, E.M.; Lima, R.S.; Joshi, N.; Shimizu, F.M.; Oliveira, O.N. Graphene-Containing Microfluidic and Chip-Based Sensor Devices for Biomolecules. In Graphene-Based Electrochemical Sensors for Biomolecules; Elsevier: Amsterdam, The Netherlands, 2019; pp. 321–336.
26. Joshi, N.; Da Silva, L.F.; Jadhav, H.; M’Peko, J.-C.; Torres, B.B.M.; Aguir, K.; Mastelaro, V.R.; Oliveira, O.N. One-step approach for preparing ozone gas sensors based on hierarchical NiCo2O4 structures. RSC Adv. 2016, 6, 92655–92662.
27. Joshi, N.; Da Silva, L.F.; Shimizu, F.M.; Mastelaro, V.R.; M’Peko, J.-C.; Lin, L.; Oliveira, O.N. UV-assisted chemiresistors made with gold-modified ZnO nanorods to detect ozone gas at room temperature. Microchim. Acta 2019, 186, 418.
28. Cagnani, G.R.; Joshi, N.; Shimizu, F.M. Carbon Nanotubes-Based Nanocomposite as Photoanode. Interfac. Eng. Funct. Mater. Dye-Sensitized Sol. Cells 2019, 213–229.
29. Ong, C.B.; Ng, L.Y.; Mohammad, A.W. A review of ZnO nanoparticles as solar photocatalysts: Synthesis, mechanisms and applications. Renew. Sustain. Energy Rev. 2018, 81, 536–551.
30. Pal, G.; Rai, P.; Pandey, A. Green synthesis of nanoparticles: A greener approach for a cleaner future. Green Synth. Charact. Appl. Nanopart. 2019, 1–26.
31. Silva, L.P.; Reis, I.G.; Bonatto, C.C. Green Synthesis of Metal Nanoparticles by Plants: Current Trends and Challenges. Green Process. Nanotechnol. 2015, 259–275.
32. Joshi, N.J.; Grewal, G.S.; Shrinet, V.; Govindan, T.P.; Pratap, A. Synthesis and dielectric behavior of nano-scale barium titanate. IEEE Trans. Dielectr. Electr. Insul. 2012, 19, 83–90.
33. Flory, P.J. Introductory lecture. Faraday Discuss. Chem. Soc. 1974, 57, 7–18.
34. Kakihana, M. Invited review ?sol-gel? preparation of high temperature superconducting oxides. J. Sol-Gel Sci. Technol. 1996, 6, 7–55.
35. Danks, A.; Hall, S.R.; Schnepp, Z. The evolution of ‘sol–gel’ chemistry as a technique for materials synthesis. Mater. Horiz. 2016, 3, 91–112.
36. Thi, T.U.D.; Nguyen, T.T.; Thi, Y.D.; Thi, K.H.T.; Phan, B.T.; Pham, K.N. Green synthesis of ZnO nanoparticles using orange fruit peel extract for antibacterial activities. RSC Adv. 2020, 10, 23899–23907.
37. Sasirekha, C.; Arumugam, S.; Muralidharan, G. Green synthesis of ZnO/carbon (ZnO/C) as an electrode material for symmetric supercapacitor devices. Appl. Surf. Sci. 2018, 449, 521–527.
38. Soares, V.; Xavier, M.; Rodrigues, E.; de Oliveira, C.; Farias, P.; Stingl, A.; Ferreira, N.; Silva, M. Green synthesis of ZnO nanoparticles using whey as an effective chelating agent. Mater. Lett. 2020, 259, 126853.
39. Palai, P.; Muduli, S.; Priyadarshini, B.; Sahoo, T.R. A facile green synthesis of ZnO nanoparticles and its adsorptive removal of Congo red dye from aqueous solution. Mater. Today Proc. 2021, 38, 2445–2451.
40. Barhoum, A.; Van Assche, G.; Rahier, H.; Fleisch, M.; Bals, S.; Delplancked, M.-P.; Leroux, F.; Bahnemann, D. Sol-gel hot injection synthesis of ZnO nanoparticles into a porous silica matrix and reaction mechanism. Mater. Des. 2017, 119, 270–276.
41. Darroudi, M.; Sabouri, Z.; Oskuee, R.K.; Zak, A.K.; Kargar, H.; Hamid, M.H.N.A. Sol–gel synthesis, characterization, and neurotoxicity effect of zinc oxide nanoparticles using gum tragacanth. Ceram. Int. 2013, 39, 9195–9199.
42. Araujo, F.P.; Trigueiro, P.P.; Honório, L.M.C.; Furtini, M.B.; Oliveira, D.M.; Almeida, L.C.; Garcia, R.R.P.; Viana, B.C.; Filho, E.C.D.S.; Osajima, J.A. A novel green approach based on ZnO nanoparticles and polysaccharides for photocatalytic performance. Dalton Trans. 2020, 49, 16394–16403.
43. Thema, F.; Manikandan, E.; Dhlamini, M.; Maaza, M. Green synthesis of ZnO nanoparticles via Agathosma betulina natural extract. Mater. Lett. 2015, 161, 124–127.
44. Stan, M.; Popa, A.; Toloman, D.; Dehelean, A.; Lung, I.; Katona, G. Enhanced photocatalytic degradation properties of zinc oxide nanoparticles synthesized by using plant extracts. Mater. Sci. Semicond. Process. 2015, 39, 23–29.
45. Sangeetha, G.; Rajeshwari, S.; Venckatesh, R. Green synthesis of zinc oxide nanoparticles by aloe barbadensis miller leaf extract: Structure and optical properties. Mater. Res. Bull. 2011, 46, 2560–2566.
46. Ali, K.; Dwivedi, S.; Azam, A.; Saquib, Q.; Al-Said, M.S.; Alkhedhairy, A.A.; Musarrat, J. Aloe vera extract functionalized zinc oxide nanoparticles as nanoantibiotics against multi-drug resistant clinical bacterial isolates. J. Colloid Interface Sci. 2016, 472, 145–156.
47. Gunalan, S.; Sivaraj, R.; Rajendran, V. Green synthesized ZnO nanoparticles against bacterial and fungal pathogens. Prog. Nat. Sci. 2012, 22, 693–700.
48. Azizi, S.; Mohamad, R.; Bahadoran, A.; Bayat, S.; Rahim, R.A.; Ariff, A.; Saad, W.Z. Effect of annealing temperature on antimicrobial and structural properties of bio-synthesized zinc oxide nanoparticles using flower extract of Anchusa italica. J. Photochem. Photobiol. B Biol. 2016, 161, 441–449.
49. Anbuvannan, M.; Ramesh, M.; Viruthagiri, G.; Shanmugam, N.; Kannadasan, N. Anisochilus carnosus leaf extract mediated synthesis of zinc oxide nanoparticles for antibacterial and photocatalytic activities. Mater. Sci. Semicond. Process. 2015, 39, 621–628.
50. Suresh, D.; Shobharani, R.; Nethravathi, P.; Kumar, M.P.; Nagabhushana, H.; Sharma, S. Artocarpus gomezianus aided green synthesis of ZnO nanoparticles: Luminescence, photocatalytic and antioxidant properties. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2015, 141, 128–134.
51. Diallo, A.; Ngom, B.; Park, E.; Maaza, M. Green synthesis of ZnO nanoparticles by Aspalathus linearis: Structural & optical properties. J. Alloys Compd. 2015, 646, 425–430.
52. Elumalai, K.; Velmurugan, S. Green synthesis, characterization and antimicrobial activities of zinc oxide nanoparticles from the leaf extract of Azadirachta indica (L.). Appl. Surf. Sci. 2015, 345, 329–336.
53. Madan, H.; Sharma, S.; Udayabhanu; Suresh, D.; Vidya, Y.; Nagabhushana, H.; Rajanaik, H.; Anantharaju, K.; Prashantha, S.; Maiya, P.S. Facile green fabrication of nanostructure ZnO plates, bullets, flower, prismatic tip, closed pine cone: Their antibacterial, antioxidant, photoluminescent and photocatalytic properties. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2016, 152, 404–416.
54. Hassan, S.S.; Abdel-Shafy, H.I.; Mansour, M.S. Removal of pharmaceutical compounds from urine via chemical coagulation by green synthesized ZnO-nanoparticles followed by microfiltration for safe reuse. Arab. J. Chem. 2019, 12, 4074–4083.
55. Supraja, N.; Prasad, T.N.V.K.V.; Krishna, T.G.; David, E. Synthesis, characterization, and evaluation of the antimicrobial efficacy of Boswellia ovalifoliolata stem bark-extract-mediated zinc oxide nanoparticles. Appl. Nanosci. 2016, 6, 581–590.
56. Singh, R.P. Biological Approach of Zinc Oxide Nanoparticles Formation and Its Characterization. Adv. Mater. Lett. 2011, 2, 313–317.
57. Mishra, P.; Singh, Y.; Nagaswarupa, H.; Sharma, S.; Vidya, Y.; Prashantha, S.; Nagabhushana, H.; Anantharaju, K.; Renuka, L. Caralluma fimbriata extract induced green synthesis, structural, optical and photocatalytic properties of ZnO nanostructure modified with Gd. J. Alloys Compd. 2016, 685, 656–669.
58. Sharma, S. ZnO nano-flowers from Carica papaya milk: Degradation of Alizarin Red-S dye and antibacterial activity against Pseudomonas aeruginosa and Staphylococcus aureus. Optik 2016, 127, 6498–6512.
59. Saikia, I.; Hazarika, M.; Tamuly, C. Synthesis, characterization of bio-derived ZnO nanoparticles and its catalytic activity. Mater. Lett. 2015, 161, 29–32.
60. Fowsiya, J.; Madhumitha, G.; Al-Dhabi, N.A.; Arasu, M.V. Photocatalytic degradation of Congo red using Carissa edulis extract capped zinc oxide nanoparticles. J. Photochem. Photobiol. B Biol. 2016, 162, 395–401.
61. Suresh, D.; Nethravathi, P.; Udayabhanu; Rajanaika, H.; Nagabhushana, H.; Sharma, S. Green synthesis of multifunctional zinc oxide (ZnO) nanoparticles using Cassia fistula plant extract and their photodegradative, antioxidant and antibacterial activities. Mater. Sci. Semicond. Process. 2015, 31, 446–454.
62. Samat, N.A.; Nor, R.M. Sol–gel synthesis of zinc oxide nanoparticles using Citrus aurantifolia extracts. Ceram. Int. 2013, 39, S545–S548.
63. Çolak, H.; Karaköse, E. Green synthesis and characterization of nanostructured ZnO thin films using Citrus aurantifolia (lemon) peel extract by spin-coating method. J. Alloys Compd. 2017, 690, 658–662.
64. Fatimah, I.; Pradita, R.Y.; Nurfalinda, A. Plant Extract Mediated of ZnO Nanoparticles by Using Ethanol Extract of Mimosa Pudica Leaves and Coffee Powder. Procedia Eng. 2016, 148, 43–48.
65. Zheng, Y.; Fu, L.; Han, F.; Wang, A.; Cai, W.; Yu, J.; Yang, J.; Peng, F. Green biosynthesis and characterization of zinc oxide nanoparticles usingCorymbia citriodoraleaf extract and their photocatalytic activity. Green Chem. Lett. Rev. 2015, 8, 59–63.
66. Thatoi, P.; Kerry, R.G.; Gouda, S.; Das, G.; Pramanik, K.; Thatoi, H.; Patra, J.K. Photo-mediated green synthesis of silver and zinc oxide nanoparticles using aqueous extracts of two mangrove plant species, Heritiera fomes and Sonneratia apetala and investigation of their biomedical applications. J. Photochem. Photobiol. B Biol. 2016, 163, 311–318.
67. Sharma, D.; Sabela, M.I.; Kanchi, S.; Mdluli, P.S.; Singh, G.; Stenström, T.A.; Bisetty, K. Biosynthesis of ZnO nanoparticles using Jacaranda mimosifolia flowers extract: Synergistic antibacterial activity and molecular simulated facet specific adsorption studies. J. Photochem. Photobiol. B Biol. 2016, 162, 199–207.
68. Banumathi, B.; Malaikozhundan, B.; Vaseeharan, B. Invitro acaricidal activity of ethnoveterinary plants and green synthesis of zinc oxide nanoparticles against Rhipicephalus (Boophilus) microplus. Vet. Parasitol. 2016, 216, 93–100.
69. Patil, B.N.; Taranath, T.C. Limonia acidissima L. leaf mediated synthesis of zinc oxide nanoparticles: A potent tool against Mycobacterium tuberculosis. Int. J. Mycobacteriol. 2016, 5, 197–204.
70. Yuvakkumar, R.; Suresh, J.; Nathanael, A.J.; Sundrarajan, M.; Hong, S. Novel green synthetic strategy to prepare ZnO nanocrystals using rambutan (Nephelium lappaceum L.) peel extract and its antibacterial applications. Mater. Sci. Eng. C 2014, 41, 17–27.
71. Karnan, T.; Selvakumar, S.A.S. Biosynthesis of ZnO nanoparticles using rambutan (Nephelium lappaceumL.) peel extract and their photocatalytic activity on methyl orange dye. J. Mol. Struct. 2016, 1125, 358–365.
72. Salam, H.A.; Sivaraj, R.; Venckatesh, R. Green synthesis and characterization of zinc oxide nanoparticles from Ocimum basilicum L. var. purpurascens Benth.-Lamiaceae leaf extract. Mater. Lett. 2014, 131, 16–18.
73. Sindhura, K.S.; Prasad, T.N.V.K.V.; Selvam, P.P.; Hussain, O.M. Synthesis, characterization and evaluation of effect of phytogenic zinc nanoparticles on soil exo-enzymes. Appl. Nanosci. 2013, 4, 819–827.
74. Rajiv, P.; Rajeshwari, S.; Venckatesh, R. Bio-Fabrication of zinc oxide nanoparticles using leaf extract of Parthenium hysterophorus L. and its size-dependent antifungal activity against plant fungal pathogens. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2013, 112, 384–387.
75. Anbuvannan, M.; Ramesh, M.; Viruthagiri, G.; Shanmugam, N.; Kannadasan, N. Synthesis, characterization and photocatalytic activity of ZnO nanoparticles prepared by biological method. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2015, 143, 304–308.
76. Qu, J.; Yuan, X.; Wang, X.; Shao, P. Zinc accumulation and synthesis of ZnO nanoparticles using Physalis alkekengi L. Environ. Pollut. 2011, 159, 1783–1788.
77. Vijayakumar, S.; Vinoj, G.; Malaikozhundan, B.; Shanthi, S.; Vaseeharan, B. Plectranthus amboinicus leaf extract mediated synthesis of zinc oxide nanoparticles and its control of methicillin resistant Staphylococcus aureus biofilm and blood sucking mosquito larvae. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2015, 137, 886–891.
78. Fu, L.; Fu, Z. Plectranthus amboinicus leaf extract–assisted biosynthesis of ZnO nanoparticles and their photocatalytic activity. Ceram. Int. 2015, 41, 2492–2496.
79. Nagajyothi, P.; Cha, S.J.; Yang, I.J.; Sreekanth, T.; Kim, K.J.; Shin, H.M. Antioxidant and anti-inflammatory activities of zinc oxide nanoparticles synthesized using Polygala tenuifolia root extract. J. Photochem. Photobiol. B Biol. 2015, 146, 10–17.
80. Sundrarajan, M.; Ambika, S.; Bharathi, K. Plant-extract mediated synthesis of ZnO nanoparticles using Pongamia pinnata and their activity against pathogenic bacteria. Adv. Powder Technol. 2015, 26, 1294–1299.
81. Jafarirad, S.; Mehrabi, M.; Divband, B.; Kosari-Nasab, M. Biofabrication of zinc oxide nanoparticles using fruit extract of Rosa canina and their toxic potential against bacteria: A mechanistic approach. Mater. Sci. Eng. C 2016, 59, 296–302.
82. Wang, D.; Liu, H.; Ma, Y.; Qu, J.; Guan, J.; Lu, N.; Lu, Y.; Yuan, X. Recycling of hyper-accumulator: Synthesis of ZnO nanoparticles and photocatalytic degradation for dichlorophenol. J. Alloys Compd. 2016, 680, 500–505.
83. Ramesh, M.; Anbuvannan, M.; Viruthagiri, G. Green synthesis of ZnO nanoparticles using Solanum nigrum leaf extract and their antibacterial activity. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2015, 136, 864–870.
84. Rana, N.; Chand, S.; Gathania, A.K. Green synthesis of zinc oxide nano-sized spherical particles using Terminalia chebula fruits extract for their photocatalytic applications. Int. Nano Lett. 2016, 6, 91–98.
85. Zhao, Z.-Y.; Wang, M.-H.; Liu, T.-T. Tribulus terrestris leaf extract assisted green synthesis and gas sensing properties of Ag-coated ZnO nanoparticles. Mater. Lett. 2015, 158, 274–277.
86. Dobrucka, R.; Długaszewska, J. Biosynthesis and antibacterial activity of ZnO nanoparticles using Trifolium pratense flower extract. Saudi J. Biol. Sci. 2016, 23, 517–523.
87. Ambika, S.; Sundrarajan, M. Antibacterial behaviour of Vitex negundo extract assisted ZnO nanoparticles against pathogenic bacteria. J. Photochem. Photobiol. B Biol. 2015, 146, 52–57.
88. Elumalai, K.; Velmurugan, S.; Ravi, S.; Kathiravan, V.; Raj, G.A. Bio-approach: Plant mediated synthesis of ZnO nanoparticles and their catalytic reduction of methylene blue and antimicrobial activity. Adv. Powder Technol. 2015, 26, 1639–1651.
89. Yang, L.; Li, X.; Wang, Z.; Shen, Y.; Liu, M. Natural fiber templated TiO2 microtubes via a double soaking sol-gel route and their photocatalytic performance. Appl. Surf. Sci. 2017, 420, 346–354.
90. Kalyanasundaram, S.; Prakash, M.J. Biosynthesis and Characterization of Titanium Dioxide Nanoparticles Using Pithecellobium Dulce and Lagenaria Siceraria Aqueous Leaf Extract and Screening their Free Radical Scavenging and Antibacterial Properties. Int. Lett. Chem. Phys. Astron. 2015, 50, 80–95.
91. Ganesan, S.; Babu, I.G.; Mahendran, D.; Arulselvi, P.I.; Elangovan, N.; Geetha, N.; Venkatachalam, P. Green engineering of titanium dioxide nanoparticles using Ageratina altissima (L.) King & H.E. Robines. medicinal plant aqueous leaf extracts for enhanced photocatalytic activity. Ann. Phytomed. Int. J. 2016, 5, 69–75.
92. Kaur, H.; Kaur, S.; Kumar, S.; Singh, J.; Rawat, M. Eco-friendly Approach: Synthesis of Novel Green TiO2 Nanoparticles for Degradation of Reactive Green 19 Dye and Replacement of Chemical Synthesized TiO2. J. Clust. Sci. 2020, 1–14.
93. Goutam, S.P.; Saxena, G.; Singh, V.; Yadav, A.K.; Bharagava, R.N.; Thapa, K.B. Green synthesis of TiO2 nanoparticles using leaf extract of Jatropha curcas L. for photocatalytic degradation of tannery wastewater. Chem. Eng. J. 2018, 336, 386–396.
94. Madadi, Z.; Bagheri Lotfabad, T. Aqueous Extract of Acanthophyllum laxiusculum Roots as a Renewable Resource for Green synthesis of nano-sized titanium dioxide using Sol-gel Method. Adv. Ceram. Prog. 2016, 2, 26–31.
95. Shreya, M.K.; Indhumathi, C.; Rajarajeswari, G.R.; AshokKumar, V.; Preethi, T. Facile green route sol–gel synthesis of nano-titania using bio-waste materials as templates. Clean Technol. Environ. Policy 2021, 23, 163–171.
96. Saikumari, N.; Preethi, T.; Abarna, B.; Rajarajeswari, G.R. Ecofriendly, green tea extract directed sol–gel synthesis of nano titania for photocatalytic application. J. Mater. Sci. Mater. Electron. 2019, 30, 6820–6831.
97. Hariharan, D.; Thangamuniyandi, P.; Selvakumar, P.; Devan, U.; Pugazhendhi, A.; Vasantharaja, R.; Nehru, L. Green approach synthesis of 2 nanoparticles: Characterization, visible light active picric acid degradation and anticancer activity. Process. Biochem. 2019, 87, 83–88.
98. Rostami-Vartooni, A.; Nasrollahzadeh, M.; Salavati-Niasari, M.; Atarod, M. Photocatalytic degradation of azo dyes by titanium dioxide supported silver nanoparticles prepared by a green method using Carpobrotus acinaciformis extract. J. Alloys Compd. 2016, 689, 15–20.
99. Gupta, S.; Tripathi, M. A review on the synthesis of TiO2 nanoparticles by solution route. Open Chem. 2012, 10, 279–294.
100. Jeyachitra, R.; Kalpana, S.; Senthil, T.S.; Kang, M. Electrical behavior and enhanced photocatalytic activity of (Ag, Ni) co-doped ZnO nanoparticles synthesized from co-precipitation technique. Water Sci. Technol. 2020, 81, 1296–1307.
101. Gurusamy, S.; Kulanthaisamy, M.R.; Hari, D.G.; Veleeswaran, A.; Thulasinathan, B.; Muthuramalingam, J.B.; Balasubramani, R.; Chang, S.W.; Arasu, M.V.; Al-Dhabi, N.A.; et al. Environmental friendly synthesis of TiO2-ZnO nanocomposite catalyst and silver nanomaterials for the enhanced production of biodiesel from Ulva lactuca seaweed and potential antimicrobial properties against the microbial pathogens. J. Photochem. Photobiol. B Biol. 2019, 193, 118–130.
102. Mbonyiryivuze, A.; Zongo, S.; Diallo, A.; Bertrand, S.; Minani, E.; Yadav, L.L.; Mwakikunga, B.; Dhlamini, S.M.; Maaza, M. Titanium Dioxide Nanoparticles Biosynthesis for Dye Sensitized Solar Cells application: Review. Phys. Mater. Chem. 2015, 3, 12–17.
103. Singh, A.; Goyal, V.; Singh, J.; Rawat, M. Structural, morphological, optical and photocatalytic properties of green synthesized TiO2 NPs. Curr. Res. Green Sustain. Chem. 2020, 3, 100033.
104. Kaur, H.; Goyal, V.; Singh, J.; Kumar, S.; Rawat, M. Biomolecules encapsulated TiO2 nano-cubes using Tinospora cordifolia for photodegradation of a textile dye. Micro Nano Lett. 2019, 14, 1229–1232.
105. Neha, N.; Thakur, A.; Rana, N.S. Epidemiology and Transmission of Infectious Diseases. In Epidemiology and Transmission of Infectious Diseases; Kumar, R., Sharma, A., Hajam, Y.A., Eds.; Career Point University: Hamirpur, India, 2020; pp. 105–119.
106. Senthilkumar, S.; Rajendran, A. Biosynthesis of TiO2 nanoparticles using Justicia gendarussa leaves for photocatalytic and toxicity studies. Res. Chem. Intermed. 2018, 44, 5923–5940.
107. Senthilkumar, S.; Ashok, M.; Kashinath, L.; Sanjeeviraja, C.; Rajendran, A. Phytosynthesis and Characterization of TiO2 Nanoparticles using Diospyros ebenum Leaf Extract and their Antibacterial and Photocatalytic Degradation of Crystal Violet. Smart Sci. 2017, 6, 1–9.
108. Sethy, N.K.; Arif, Z.; Mishra, P.K.; Kumar, P. Green synthesis of TiO2 nanoparticles from Syzygium cumini extract for photo-catalytic removal of lead (Pb) in explosive industrial wastewater. Green Process. Synth. 2020, 9, 171–181.
109. Subhapriya, S.; Gomathipriya, P. Green synthesis of titanium dioxide (TiO2) nanoparticles by Trigonella foenum-graecum extract and its antimicrobial properties. Microb. Pathog. 2018, 116, 215–220.
110. Muniandy, S.S.; Kaus, N.H.M.; Jiang, Z.-T.; Altarawneh, M.; Lee, H.L. Green synthesis of mesoporous anatase TiO2 nanoparticles and their photocatalytic activities. RSC Adv. 2017, 7, 48083–48094.
111. Bhuyan, T.; Mishra, K.; Khanuja, M.; Prasad, R.; Varma, A. Biosynthesis of zinc oxide nanoparticles from Azadirachta indica for antibacterial and photocatalytic applications. Mater. Sci. Semicond. Process. 2015, 32, 55–61.
112. Vijayakumar, S.; Vaseeharan, B.; Malaikozhundan, B.; Shobiya, M. Laurus nobilis leaf extract mediated green synthesis of ZnO nanoparticles: Characterization and biomedical applications. Biomed. Pharmacother. 2016, 84, 1213–1222.
113. Raja, A.; Ashokkumar, S.; Marthandam, R.P.; Jayachandiran, J.; Khatiwada, C.P.; Kaviyarasu, K.; Raman, R.G.; Swaminathan, M. Eco-friendly preparation of zinc oxide nanoparticles using Tabernaemontana divaricata and its photocatalytic and antimicrobial activity. J. Photochem. Photobiol. B Biol. 2018, 181, 53–58.
114. Rathnasamy, R.; Thangasamy, P.; Thangamuthu, R.; Sampath, S.; Alagan, V. Green synthesis of ZnO nanoparticles using Carica papaya leaf extracts for photocatalytic and photovoltaic applications. J. Mater. Sci. Mater. Electron. 2017, 28, 10374–10381.
115. Kumar, B.P.; Arthanareeswari, M.; Devikala, S.; Sridharan, M.; Selvi, J.A.; Malini, T.P. Green synthesis of zinc oxide nanoparticles using Typha latifolia L. leaf extract for photocatalytic applications. Mater. Today Proc. 2019, 14, 332–337.
116. Lu, J.; Batjikh, I.; Hurh, J.; Han, Y.; Ali, H.; Mathiyalagan, R.; Ling, C.; Ahn, J.C.; Yang, D.C. Photocatalytic degradation of methylene blue using biosynthesized zinc oxide nanoparticles from bark extract of Kalopanax septemlobus. Optik 2019, 182, 980–985.
117. Shanavas, S.; Duraimurugan, J.; Kumar, G.S.; Ramesh, R.; Acevedo, R.; Anbarasan, P.; Maadeswaran, P. Ecofriendly green synthesis of ZnO nanostructures using Artabotrys Hexapetalu and Bambusa Vulgaris plant extract and investigation on their photocatalytic and antibacterial activity. Mater. Res. Express 2019, 6, 105098.
118. Quek, J.-A.; Sin, J.-C.; Lam, S.-M.; Mohamed, A.R.; Zeng, H. Bioinspired green synthesis of ZnO structures with enhanced visible light photocatalytic activity. J. Mater. Sci. Mater. Electron. 2019, 31, 1144–1158.
119. Varadavenkatesan, T.; Lyubchik, E.; Pai, S.; Pugazhendhi, A.; Vinayagam, R.; Selvaraj, R. Photocatalytic degradation of Rhodamine B by zinc oxide nanoparticles synthesized using the leaf extract of Cyanometra ramiflora. J. Photochem. Photobiol. B Biol. 2019, 199, 111621.
120. Osuntokun, J.; Onwudiwe, D.C.; Ebenso, E.E. Green synthesis of ZnO nanoparticles using aqueous Brassica oleracea L. var. italica and the photocatalytic activity. Green Chem. Lett. Rev. 2019, 12, 444–457.
121. Singh, S.; Joshi, M.; Panthari, P.; Malhotra, B.; Kharkwal, A.; Kharkwal, H. Citrulline rich structurally stable zinc oxide nanostructures for superior photo catalytic and optoelectronic applications: A green synthesis approach. Nano-Struct. Nano-Obj. 2017, 11, 1–6.
122. Liu, Y.C.; Li, J.; Ahn, J.; Pu, J.; Rupa, E.J.; Huo, Y.; Yang, D.C. Biosynthesis of zinc oxide nanoparticles by one-pot green synthesis using fruit extract of Amomum longiligulare and its activity as a photocatalyst. Optik 2020, 218, 165245.
123. Kavitha, S.; Dhamodaran, M.; Prasad, R.; Ganesan, M. Synthesis and characterisation of zinc oxide nanoparticles using terpenoid fractions of Andrographis paniculata leaves. Int. Nano Lett. 2017, 7, 141–147.
124. Rupa, E.J.; Anandapadmanaban, G.; Mathiyalagan, R.; Yang, D.-C. Synthesis of zinc oxide nanoparticles from immature fruits of Rubus coreanus and its catalytic activity for degradation of industrial dye. Optik 2018, 172, 1179–1186.
125. Akir, S.; Barras, A.; Coffinier, Y.; Bououdina, M.; Boukherroub, R.; Omrani, A.D. Eco-friendly synthesis of ZnO nanoparticles with different morphologies and their visible light photocatalytic performance for the degradation of Rhodamine B. Ceram. Int. 2016, 42, 10259–10265.
126. Charoenthai, N.; Yomma, N. Effect of Annealing Temperature and Solvent on the Physical Properties and Photocatalytic activity of Zinc Oxide Powder Prepared by Green Synthesis Method. Mater. Today Proc. 2019, 17, 1386–1395.
127. Hayashi, H.; Hakuta, Y. Hydrothermal Synthesis of Metal Oxide Nanoparticles in Supercritical Water. Materials 2010, 3, 3794–3817.
128. Byrappa, K.; Adschiri, T. Hydrothermal technology for nanotechnology. Prog. Cryst. Growth Charact. Mater. 2007, 53, 117–166.
129. Chang, T.-H.; Lu, Y.-C.; Yang, M.-J.; Huang, J.-W.; Chang, P.-F.L.; Hsueh, H.-Y. Multibranched flower-like ZnO particles from eco-friendly hydrothermal synthesis as green antimicrobials in agriculture. J. Clean. Prod. 2020, 262, 121342.
130. Guo, T.H.; Liu, Y.; Zhang, Y.C.; Zhang, M. Green hydrothermal synthesis and optical absorption properties of ZnO2 nanocrystals and ZnO nanorods. Mater. Lett. 2011, 65, 639–641.
131. Liu, S.Z.; Zhang, Y.C.; Wang, T.X.; Yang, F.X. Green synthesis of hollow-nanostructured ZnO2 and ZnO. Mater. Lett. 2012, 71, 154–156.
132. Wang, C.; Wang, H.; Chen, Q.; Ren, B.; Duan, R.; Guan, R. Synchronous regulation of morphology and crystal phase of TiO2 via a facile green hydrothermal approach and their photocatalytic activity. Mater. Res. Bull. 2019, 109, 90–97.
133. Spada, E.R.; Pereira, E.A.; Montanhera, M.A.; Morais, L.H.; Freitas, R.G.; Costa, R.G.F.; Soares, G.B.; Ribeiro, C.; De Paula, F.R. Preparation, characterization and application of phase-pure anatase and rutile TiO2 nanoparticles by new green route. J. Mater. Sci. Mater. Electron. 2017, 28, 16932–16938.
134. Hariharan, D.; Christy, A.J.; Mayandi, J.; Nehru, L.; Jeyanthinath, M. Visible light active photocatalyst: Hydrothermal green synthesized TiO2 NPs for degradation of picric acid. Mater. Lett. 2018, 222, 45–49.
135. Hariharan, D.; Thangamuniyandi, P.; Christy, A.J.; Vasantharaja, R.; Selvakumar, P.; Sagadevan, S.; Pugazhendhi, A.; Nehru, L. Enhanced photocatalysis and anticancer activity of green hydrothermal synthesized 2 nanoparticles. J. Photochem. Photobiol. B Biol. 2020, 202, 111636.
136. Reddy, M.P.; Mohamed, A. One-pot solvothermal synthesis and performance of mesoporous magnetic ferrite MFe2O4 nanospheres. Microporous Mesoporous Mater. 2015, 215, 37–45.
137. Zhang, W.; Quan, B.; Lee, C.; Park, S.-K.; Li, X.; Choi, E.; Diao, G.; Piao, Y. One-Step Facile Solvothermal Synthesis of Copper Ferrite–Graphene Composite as a High-Performance Supercapacitor Material. ACS Appl. Mater. Interfaces 2015, 7, 2404–2414.
138. Muthukumar, K.; Lakshmi, D.S.; Acharya, S.D.; Natarajan, S.; Mukherjee, A.; Bajaj, H.; Natarjan, S.; Mukerjee, A. Solvothermal synthesis of magnetic copper ferrite nano sheet and its antimicrobial studies. Mater. Chem. Phys. 2018, 209, 172–179.
139. Xiao, B.; Wang, F.; Zhai, C.; Wang, P.; Xiao, C.; Zhang, M. Facile synthesis of In2O3 nanoparticles for sensing properties at low detection temperature. Sens. Actuators B Chem. 2016, 235, 251–257.
140. Zhai, X.; Chen, Y.; Ma, Y.; Liu, Y.; Liu, J. Fabrication of monodisperse ITO submicro-spheres using l-Histidine-assisted one-step solvothermal method. Ceram. Int. 2019, 45, 17562–17566.
141. Wu, C. Solvothermal synthesis of N-doped CeO2 microspheres with visible light-driven photocatalytic activity. Mater. Lett. 2015, 139, 382–384.
142. Kaviyarasu, K.; Manikandan, E.; Nuru, Z.; Maaza, M. Investigation on the structural properties of CeO2 nanofibers via CTAB surfactant. Mater. Lett. 2015, 160, 61–63.
143. Bai, X.; Li, L.; Liu, H.; Tan, L.; Liu, T.; Meng, X. Solvothermal Synthesis of ZnO Nanoparticles and Anti-Infection Application in Vivo. ACS Appl. Mater. Interfaces 2015, 7, 1308–1317.
144. Zare, M.; Namratha, K.; Byrappa, K.; Surendra, D.; Yallappa, S.; Hungund, B. Surfactant assisted solvothermal synthesis of ZnO nanoparticles and study of their antimicrobial and antioxidant properties. J. Mater. Sci. Technol. 2018, 34, 1035–1043.
145. Razali, R.; Zak, A.K.; Majid, W.A.; Darroudi, M. Solvothermal synthesis of microsphere ZnO nanostructures in DEA media. Ceram. Int. 2011, 37, 3657–3663.
146. Wojnarowicz, J.; Chudoba, T.; Gierlotka, S.; Sobczak, K.; Lojkowski, W. Size Control of Cobalt-Doped ZnO Nanoparticles Obtained in Microwave Solvothermal Synthesis. Crystals 2018, 8, 179.
147. Šarić, A.; Štefanić, G.; Dražić, G.; Gotić, M. Solvothermal synthesis of zinc oxide microspheres. J. Alloys Compd. 2015, 652, 91–99.
148. Pachfule, P.; Das, R.; Poddar, P.; Banerjee, R. Solvothermal Synthesis, Structure, and Properties of Metal Organic Framework Isomers Derived from a Partially Fluorinated Link. Cryst. Growth Des. 2011, 11, 1215–1222.
149. Liang, W.; D’Alessandro, D.M. Microwave-assisted solvothermal synthesis of zirconium oxide based metal–organic frameworks. Chem. Commun. 2013, 49, 3706–3708.
150. McKinstry, C.; Cathcart, R.J.; Cussen, E.J.; Fletcher, A.J.; Patwardhan, S.V.; Sefcik, J. Scalable continuous solvothermal synthesis of metal organic framework (MOF-5) crystals. Chem. Eng. J. 2016, 285, 718–725.
151. Zhang, C.; Ai, L.; Jiang, J. Solvothermal synthesis of MIL–53(Fe) hybrid magnetic composites for photoelectrochemical water oxidation and organic pollutant photodegradation under visible light. J. Mater. Chem. A 2014, 3, 3074–3081.
152. Liu, X.; Fu, W.; Bouwman, E. One-step growth of lanthanoid metal–organic framework (MOF) films under solvothermal conditions for temperature sensing. Chem. Commun. 2016, 52, 6926–6929.
153. Li, Z.-Q.; Mo, L.-E.; Chen, W.-C.; Shi, X.-Q.; Wang, N.; Hu, L.-H.; Hayat, T.; Alsaedi, A.; Dai, S.-Y. Solvothermal Synthesis of Hierarchical TiO2 Microstructures with High Crystallinity and Superior Light Scattering for High-Performance Dye-Sensitized Solar Cells. ACS Appl. Mater. Interfaces 2017, 9, 32026–32033.
154. Mamaghani, A.H.; Haghighat, F.; Lee, C.-S. Hydrothermal/solvothermal synthesis and treatment of TiO2 for photocatalytic degradation of air pollutants: Preparation, characterization, properties, and performance. Chemosphere 2019, 219, 804–825.
155. Yadav, H.M.; Kim, J.-S. Solvothermal synthesis of anatase TiO2-graphene oxide nanocomposites and their photocatalytic performance. J. Alloys Compd. 2016, 688, 123–129.
156. Ramakrishnan, V.M.; Natarajan, M.; Santhanam, A.; Asokan, V.; Velauthapillai, D. Size controlled synthesis of TiO2 nanoparticles by modified solvothermal method towards effective photo catalytic and photovoltaic applications. Mater. Res. Bull. 2018, 97, 351–360.
157. Cao, Y.; Zong, L.; Li, Q.; Li, C.; Li, J.; Yang, J. Solvothermal synthesis of TiO2 nanocrystals with facets using titanic acid nanobelts for superior photocatalytic activity. Appl. Surf. Sci. 2017, 391, 311–317.
158. Emadzadeh, D.; Ghanbari, M.; Lau, W.J.; Rahbari-Sisakht, M.; Matsuura, T.; Ismail, A.F.; Kruczek, B. Solvothermal synthesis of nanoporous TiO2: The impact on thin-film composite membranes for engineered osmosis application. Nanotechnology 2016, 27, 345702.
159. Zhang, X.; Dong, S.; Zhou, X.; Yan, L.; Chen, G.; Dong, S.; Zhou, D. A facile one-pot synthesis of Er–Al co-doped ZnO nanoparticles with enhanced photocatalytic performance under visible light. Mater. Lett. 2015, 143, 312–314.
160. Šutka, A.; Timusk, M.; Döbelin, N.; Pärna, R.; Visnapuu, M.; Joost, U.; Käämbre, T.; Kisand, V.; Saal, K.; Knite, M. A straightforward and “green” solvothermal synthesis of Al doped zinc oxide plasmonic nanocrystals and piezoresistive elastomer nanocomposite. RSC Adv. 2015, 5, 63846–63852.
161. Liu, J.; Zeng, M.; Yu, R. Surfactant-free synthesis of octahedral ZnO/ZnFe2O4 heterostructure with ultrahigh and selective adsorption capacity of malachite green. Sci. Rep. 2016, 6, 25074.
162. Mahlaule-Glory, L.M.; Mbita, Z.; Ntsendwana, B.; Mathipa, M.M.; Mketo, N.; Hintsho-Mbita, N.C. ZnO nanoparticles via Sutherlandia frutescens plant extract: Physical and biological properties. Mater. Res. Express 2019, 6, 085006.
163. Chu, L.; Zhang, J.; Liu, W.; Zhang, R.; Yang, J.; Hu, R.; Li, X.; Huang, W. A Facile and Green Approach to Synthesize Mesoporous Anatase TiO2 Nanomaterials for Efficient Dye-Sensitized and Hole-Conductor-Free Perovskite Solar Cells. ACS Sustain. Chem. Eng. 2018, 6, 5588–5597.
164. Wang, P.; Xie, T.; Wang, D.; Dong, S. Facile synthesis of TiO2(B) crystallites/nanopores structure: A highly efficient photocatalyst. J. Colloid Interface Sci. 2010, 350, 417–420.
165. Pan, J.H.; Han, G.; Zhou, R.; Zhao, X.S. Hierarchical N-doped TiO2 hollow microspheres consisting of nanothorns with exposed anatase facets. Chem. Commun. 2011, 47, 6942–6944.
166. Chen, Q.; Ren, B.; Zhao, Y.; Xu, X.; Ge, H.; Guan, R.; Zhao, J. Template-Free Synthesis of Core-Shell TiO2 Microspheres Covered with High-Energy -Facet-Exposed N-Doped Nanosheets and Enhanced Photocatalytic Activity under Visible Light. Chem. A Eur. J. 2014, 20, 17039–17046.
167. Zhao, J.; Ge, S.; Pan, D.; Shao, Q.; Lin, J.; Wang, Z.; Hu, Z.; Wu, T.; Guo, Z. Solvothermal synthesis, characterization and photocatalytic property of zirconium dioxide doped titanium dioxide spinous hollow microspheres with sunflower pollen as bio-templates. J. Colloid Interface Sci. 2018, 529, 111–121.
168. Zhou, Y.; Wang, X.; Wang, H.; Song, Y.; Fang, L.; Ye, N.; Wang, L. Enhanced dye-sensitized solar cells performance using anatase TiO2 mesocrystals with the Wulff construction of nearly 100% exposed facets as effective light scattering layer. Dalton Trans. 2014, 43, 4711–4719.