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제125회 대한화학회 학술발표회 및 총회 3D Printing of Carbon-nanotube/Polydimethylsiloxane Composites for Moldless Flexible Pressure Sensor

2020년 1월 29일 10시 36분 37초
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Polymer Chemistry
저자 및
Daeyeon Cho, Nayoon Pyun, Kwanwoo Shin*
Department of Chemistry, Sogang University, Korea
Highly elastic nanocomposite piezoresistive pressure sensor have recently received considerable attention in many areas due to its broad applications in fields, such as robotics, wearable flexible electronics, electronic skin (E-skin) and medical devices. For these purposes, piezoresistive pressure sensor should have the advantages of high sensitivity, a simple manufacturing process, good flexibility and stability. Here, we demonstrate the 3D printing of hydrophobic CNT/PDMS composites within a hydrophilic carbomer gel support via freeform reversible embedding (FRE) to make mold-less flexible pressure sensors. Because only few researchers reported about 3D structure piezoresistive CNT/PDMS sensor, we tried to develop various 3D structural piezoresistive pressure sensor. Next, to print our sensor, we used FRE printing process, the carbomer support act as a Bingham plastic that yields and fluidizes when the syringe tip of the 3D printer moves through it, but act as a solid for the PDMS extrude within it. After we print out CNT/PDMS pressure sensor, we test their mechanical properties, such as conductivity, sensitivity and use it as a transducer, and receive the signal using LabVIEW. Finally, we found that the structure can affect to their resistivity and sensitivity. Our spiral structure composites have more high resistivity and sensitivity than pyramid structure composites.