120th General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code POLY.P-34
Subject 3D printing of moldless flexible pressure sensor using bingham plastic
Authors SOOMIN JO, Kwanwoo Shin*
Department of Chemistry, Sogang University, Korea
Abstract Devices made from stretchable electronic materials are under huge interest as future application for wearable device in means for clothing or directly attached sensor. Such materials have typically been prepared by engineering elastomeric materials such as silicon.[1] Here we studied 3D printed flexible and moldless fabricated pressure sensor. Stretchable 3D structures were commonly fabricated by mold which are made through complicated process. But by 3D printing the viscoplastic elastomer inside the bingham plastic without mold the structure maintain itself without collapsing. We used CNT/PDMS as piezoresistive nanocomposite to print out pressure sensor structure. The structure is uniformly aligned with independently arrayed deformable pyramidal tips that works as a piezoresistive sensor. The easily deformable pressure sensing tips determines the contact interface, which effects the compressibility in response to external pressure.[2] The counter electrode was easily printed through commercial office printer using silver nanoparticle ink. When the external pressure is introduced, a potential difference with respect to piezoresistive electrode can induce electric current flow through the contact area bridging two terminals. The sensor could sense the continuous and discontinuous finger tapping. Further study through LABVIEW color analysis of pressure distribution with independently arrayed electrodes was also possible. [1] Yamada, T. et al. A stretchable carbon nanotube strain sensor for human-motion detection. Nature Nanotechnology. 6, 296-301 (2011) [2] Chwee-Lin, C. et al. Highly stretchable resistive pressure sensors using a conductive elastomeric composite on a micropyramid array. Advanced Material. 26, 3451-3458 (2014)
E-mail wfy92@naver.com