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      • Theses - Graduate Program in Materials Science and Nanotechnology
      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Graduate Program in Materials Science and Nanotechnology
      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      High performance multimaterial fibers and devices

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      Embargo Lift Date: 2018-06-30
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      Author
      Say, Mehmet Girayhan
      Advisor
      Bayındır, Mehmet
      Date
      2016-06
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Fabricating low energy requiring and self-powered flexible electronic devices can decrease world energy need since energy demand seems to be one of the most fundamental problems in the near future. An excellent solution to overcome this drawback is fabricating functional and energy efficient materials. Fabricating high piezoelectric coefficient materials that are compatible with mass production, easy to produce, low cost and non-toxic is highly demanded in order to design highly sensitive sensors and self-powered devices. This thesis introduces piezoelectric polymer (PVDF-TrFE) based several sensor types, energy harvesting devices such as; prosthetic hand, cardiac sensors, electronic skin, which represent promising device architectures for flexible electronics. Semiconductor, metal, composite, piezoelectric materials or polymers can be drawn by thermal fiber drawing and by applying iterative size reduction technique, the geometry, size and length of fabricated structures can be controlled, which also enables us to design novel in fiber, fiber-array devices at nanoscale. First, to enhance PVDF-TrFE fiber performance, crystallinity of fibers was improved by introducing new designs and phase transition mechanism was investigated in fabricated films and fibers. Finally, conductive composite material for flexible interconnects and electrodes was developed. As a whole, a variety of novel piezoelectric and conductive composite fibers were fabricated by using novel size reduction technique and fiber devices were designed for flexible electronics applications.
      Keywords
      Piezoelectricity
      PVDF-TrFE
      Polymer fiber drawing
      E-skin
      Conductive composites
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      http://hdl.handle.net/11693/30167
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      • Graduate Program in Materials Science and Nanotechnology - Master's degree 142
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