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Electronic Textiles
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Electronic textiles belong to the broader range of smart (or “intelligent”) textiles. Their “smartness” is enabled by embedded or added electronics and allows the sensing of defined parameters of their environment as well as actuating according to these sensor data. For this purpose, different sensors (e.g., temperature, strain, light sensors) and actuators (e.g., LEDs or mechanical actuators) are embedded and connected with a power supply, a data processor, and internal/external communication. 

smart textiles electronic textiles e-textiles sensors actuators conductive yarn body functions textile batteries textile circuits single-board microcontroller (SBM)
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While textiles have been used by humans since thousands of years, smart textiles have only been developed during the last decades [1]. Usually, textiles are defined as “smart” when they can respond to changes of environmental parameters, e.g., by changing their color due to UV irradiation or by measuring vital signs and sending them to a smartphone to enable the investigation of one’s fitness level. In many cases, such “smart” functionalities are based on electronic components, defining them as electronic textiles or e-textiles.
Such e-textiles usually contain sensors, actuators, internal/external communication, a power source, and finally a data processor [2]. Many of these parts were only made available during the last decades by inventions such as conductive polymers [3] or transistors, often based on one or two fine metal wires coated by an organic semiconductor [4][5][6]. Other parts, such as the data processor, cannot be transferred into textile structures, but due to steady miniaturization are more and more able to be integrated into textile structures [7]. Many other electronic parts made their way from being added to textiles by sewing, to integration on the fabric level and more recently even on the yarn or fiber level [8]. Nowadays, diverse levels of textile integration can be found in e-textiles, from wearable computers with openly visible electronics, using textiles only to make the electronics wearable [9][10], to fully integrated electronic functionalities [11][12].
With higher grades of integration of electronics into textiles, new challenges arise. On the one hand, textiles are flexible and often even stretchable, which causes strong mechanical influences on integrated electronics [13][14]; on the other hand, electronics which cannot be removed need to be washable [15]. Other challenges are related to the integration of batteries, power-packs, or solar cells which are usually either flexible or elastic or have a high capacity and maximum current, but normally do not combine both these properties [16][17][18].
Besides these technical challenges, sometimes problems occur due to high prices or due to low acceptance by the target group [19], especially when designing e-textiles measuring vital data to enable elderly people to live alone as long as possible, with the security that in case of a medical emergency the e-textile will detect the dangerous situation and call for help in time. In this situation, where an e-textile would be an ideal solution to support vulnerable people, privacy protection is of the utmost importance to increase the acceptance of the target group.
Thinking about the measurements of vital signs, such as pulse or full ECG, breathing frequency, or skin temperature, such parameters are not only important for people who may experience medical emergency situations, but also for rehabilitation and for athletes or people with physically strenuous jobs such as firefighters on duty [20][21][22].
In this entry, we concentrate on new technological approaches and give an overview of some recent applications of electronic textiles.

References

  1. Koncar, V. Introduction to smart textiles and their application. In Smart Textiles and Their Application, 1st ed.; Koncar, V., Ed.; Woodhead Publishing: Cambridge, UK, 2016; pp. 1–8.
  2. Schwarz, A.; van Langenhove, L.; Guermonprez, P.; Deguillemont, D. A roadmap on smart textiles. Text. Prog. 2010, 42, 99–180.
  3. Shirakawa, H.; Louis, E.J.; MacDiarmid, A.G.; Chiang, C.K.; Heeger, A.J. Synthesis of electrically conducting organic polymers: Halogen derivatives of polyacetylene,(CH)x. J. Chem. Soc. Chem. Commun. 1977, 16, 578–580.
  4. Münzenrieder, N.; Vogt, C.; Petti, L.; Salvatore, G.A.; Cantarella, G.; Büthe, L.; Tröster, G. Oxide thin-film transistors on fibers for smart textiles. Technologies 2017, 5, 31.
  5. Owyeung, R.E.; Terse-Thakoor, T.; Nejad, H.R.; Panzer, M.J.; Sonkusale, S.R. Highly flexible transistor threads for all-thread based integrated circuits and multiplexed diagnostics. ACS Appl. Mater. Interfaces 2019, 11, 31096–91104.
  6. Kim, S.J.; Kim, H.J.; Ahn, J.T.; Hwang, D.K.; Ju, H.S.; Park, M.-C.; Yang, H.C.; Kim, S.H.; Jang, H.W.; Lim, J.A. A new architecture for fibrous organic transistors based on a double-stranded assembly of electrode microfibers for electronic textile applications. Adv. Mater. 2019, 31, 1900564.
  7. Ehrmann, G.; Ehrmann, A. Suitability of common single circuit boards for sensing and actuating in smart textiles. Commun. Dev. Assem. Text. Prod. 2020, 1, 170–179.
  8. Hughes-Riley, T.; Dias, T.; Cork, C. A historical review of the development of electronic textiles. Fibers 2018, 6, 34.
  9. Park, S.; Mackenzie, K.; Jayaraman, S. The Wearable Motherboard: A Framework for Personalized Mobile Information Processing (PMIP). In Proceedings of the 39th Annual Design Automation Conference (DAC 02), New Orleans, LA, USA, 10–14 June 2002; pp. 170–174.
  10. Marculescu, D.; Marculescu, R.; Zamora, N.H.; Stanley-Marbell, P.; Khosla, P.K.; Park, S.; Jayaraman, S.; Jung, S.; Lauterbach, C.; Weber, W.; et al. Electronic textiles: A platform for pervasive computing. Proc. IEEE 2003, 91, 1995–2018.
  11. Wagner, S.; Bonderover, E.; Jordan, W.B.; Sturm, J.C. Electrotextiles: Concepts and challenges. Int. J. High Speed Electron. Syst. 2002, 12, 391–399.
  12. Hamedi, M.; Forchheimer, R.; Inganäs, O. Towards woven logic from organic electronic fibers. Nat. Mater. 2007, 6, 357–362.
  13. Cherenack, K.H.; Zysset, C.; Kinkeldei, T.; Münzenrieder, N.; Tröster, G. Woven electronic fibers with sensing and display functions for smart textiles. Adv. Mater. 2010, 22, 5178–5182.
  14. Schwarz-Pfeiffer, A.; Obermann, M.; Weber, M.O.; Ehrmann, A. Smarten up garments through knitting. IOP Conf. Ser. Mater. Sci. Eng. 2016, 141, 012008.
  15. Trummer, S.; Ehrmann, A.; Büsgen, A. Development of underwear with integrated 12 channel ECG for men and women. AUTEX Res. J. 2017, 17, 344–349.
  16. Suga, T.; Konishi, H.; Nishide, H. Photocrosslinked nitroxide polymer cathode-active materials for application in an organic-based paper battery. Chem. Commun. 2007, 17, 1730–1732.
  17. Resuli, R.; Turhan, I.; Ehrmann, A.; Blachowicz, T. Textile-based batteries with nanofiber interlayer. AIMS Energy 2018, 6, 261–268.
  18. Kohn, S.; Wehlage, D.; Junger, I.J.; Ehrmann, A. Electrospinning a dye-sensitized solar cell. Catalysts 2019, 9, 975.
  19. Cherenack, K.; van Pieterson, L. Smart textiles: Challenges and opportunities. J. Appl. Phys. 2012, 112, 091301.
  20. Paiva, A.; Ferreira, F.; Catarino, A.; Carvalho, M.; Carvalho, H. Design of smart garments for sports and rehabilitation. IOP Conf. Ser. Mater. Sci. Eng. 2018, 459, 012083.
  21. Scataglini, S.; Moorhead, A.P.; Feletti, F. A systematic review of smart clothing in sports: Possible applications to extreme sports. Muscles Ligaments Tendons J. 2020, 10, 333–342.
  22. Khundaqji, H.; Hing, W.; Furness, J.; Climstein, M. Smart shirts for monitoring physiological parameters: Scoping review. JMIR Mhealth Uhealth 2020, 8, e18092.
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    Ehrmann, G.; Ehrmann, A. Electronic Textiles. Encyclopedia. Available online: https://encyclopedia.pub/entry/6597 (accessed on 04 October 2022).
    Ehrmann G, Ehrmann A. Electronic Textiles. Encyclopedia. Available at: https://encyclopedia.pub/entry/6597. Accessed October 04, 2022.
    Ehrmann, Guido, Andrea Ehrmann. "Electronic Textiles," Encyclopedia, https://encyclopedia.pub/entry/6597 (accessed October 04, 2022).
    Ehrmann, G., & Ehrmann, A. (2021, January 20). Electronic Textiles. In Encyclopedia. https://encyclopedia.pub/entry/6597
    Ehrmann, Guido and Andrea Ehrmann. ''Electronic Textiles.'' Encyclopedia. Web. 20 January, 2021.
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