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Study and Fabrication of Flexible and Stretchable Electronic Circuits

Valinejad, Amir Ali | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51264 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sarvari, Reza; Kolahdouz Esfahani, Mohammad Reza
  7. Abstract:
  8. In recent years, flexible electronics have started to attract a tremendeos amount of attention, partly on its remarkable growth in new technologies like IoT, wearable electronics, personal and health care devices. This emerging field offers many advantages compared to its traditional rigid counterparts, such as bendability, stretchablity, recyclability and biocompatibility. Inkjet printing is one of the most promising method for realizing flexible electronics due to its low-investment cost, fully additive nature, low material westage, relatively low temperature process and non-contact patterning.A printed circuit board (PCB), is undoubtedly a vital part of any electronics systems. So, optimizing the process of printing conductive tracks on different substrates, plays a key role in achieving our goals. We modified a commercial desktop ink-jet printer to let us print on various flexible and rigid substrates. Novacentrix Metalon Nanosilver ink was selected as the reference ink in this investigation. We reached sheet resistance around of 0.2Ω/square on regular glossy photo paper on repeatable line width of around 40μm. To check the process on stretchable substrates, thin sheets of PDMS and TPU were prepared to print conductive tracks on them. Printed patterns suffered from poor ink adhesion to the polymeric surfaces. Different physical, optical and combinational solutions were applied to activate the substrate surface and inhance ink adhesion. We have finally been in substantially improving the surface energy and creating tracks with sheet resistance of less than 2Ω/square on stretchable substrates. Lastly, in order to investigate the effect of high frequency signals, we have created multiple rigid and flexible antennas using endeavors in printing flexible and stretchable circuits and creating smart devices
  9. Keywords:
  10. Printed Electronics ; Printed Circuits ; Flexible Electronics ; Stretchable Electronics ; Printed Electronics ; Wearable Electronics

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