3D-printing-assisted flexible pressure sensor with a concentric circle pattern and high sensitivity for health monitoring  

作　　者：Jihun Lee Hongyun So 

机构地区：[1]Department of Mechanical Engineering,Hanyang University,Seoul 04763,South Korea [2]institute of Nano Science and Technology,Hanyang University,Seoul 04763,South Korea

出　　处：《Microsystems & Nanoengineering》2023年第2期321-332,共12页微系统与纳米工程（英文）

基　　金：supported by the National Research Foundation of Korea(NRF),funded by the Ministry of Science and ICT of the Republic of Korea(No.NRF-2021R1C1C1010836).

摘　　要：In this study,a flexible pressure sensor is fabricated using polydimethylsiloxane(PDMS)with a concentric circle pattern(CCP)obtained through a fused deposition modeling(FDM)-type three-dimensional(3D)printer and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)as the active layer.Through layer-by-layer additive manufacturing,the CCP surface is generated from a thin cone model with a rough surface by the FDM-type 3D printer.A novel compression method is employed to convert the cone shape into a planar microstructure above the glass transition temperature of a polylactic acid(PLA)flament.To endow the CCP surface with conductivity,PDMS is used to replicate the compressed PLA,and PEDOT:PSS is coated by drop-casting.The size of the CCP is controlled by changing the printing layer height(PLH),which is one of the 3D printing parameters.The sensitivity increases as the PLH increases,and the pressure sensor with a 0.16 mm PLH exhibits outstanding sensitivity(160 kPa^(-1)),corresponding to a linear pressure range of 0-0.577 kPa with a good linearity of R^(2)=0.978,compared to other PLHs.This pressure sensor exhibits stable and repeatable operation under various pressures and durability under 6.56 kPa for 4000 cycles.Finally,monitoring of various health signals such as those for the wrist pulse,swallowing,and pronunciation of words is demonstrated as an application.These results support the simple fabrication of a highly sensitive,flexible pressure sensor for human health monitoring.

关 键 词：PRINTING PATTERN PDMS 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]