Multiscale Hierarchical Design of a Flexible Piezoresistive Pressure Sensor with High Sensitivity and Wide Linearity Range

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Jidong ShiYing Fang

Abstract

Flexible piezoresistive pressure sensors have been attracting wide attention for applications in health monitoring and human-machine interfaces because of their simple device structure and easy-readout signals. For practical applications, flexible pressure sensors with both high sensitivity and wide linearity range are highly desirable. Herein, a simple and low-cost method for the fabrication of a flexible piezoresistive pressure sensor with a hierarchical structure over large areas is presented. The piezoresistive pressure sensor consists of arrays of microscale papillae with nanoscale roughness produced by replicating the lotus leaf's surface and spray-coating of graphene ink. Finite element analysis (FEA) shows that the hierarchical structure governs the deformation behavior and pressure distribution at the contact interface, leading to a quick and steady increase in contact area with loads. As a result, the piezoresistive pressure sensor demonstrates a high sensitivity of 1.2 kPa-1 and a wide linearity range from 0 to 25 kPa. The flexible pressure sensor is applied for sensitive monitoring of small vibrations, including wrist pulse and acoustic waves. Moreover, a piezoresistive pressure sensor array is fabricated for mappin...Continue Reading

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Citations

Jun 28, 2019·Frontiers in Chemistry·Haizhou HuangLitao Sun
Apr 2, 2020·Nanoscale Research Letters·Yunlu LianHefei Zhang
Feb 20, 2021·ACS Applied Materials & Interfaces·Yi Ming YinGuang Zhu
Mar 9, 2021·ACS Applied Materials & Interfaces·Kyubin BaeJongbaeg Kim
Jun 15, 2021·ACS Applied Materials & Interfaces·Haihang WangXiangqiong Zeng
Jul 31, 2021·ACS Applied Materials & Interfaces·Takuya TsudaAndreas Fery
Mar 7, 2020·ACS Applied Materials & Interfaces·Xue-Feng ZhaoHong-Liang Lu
Mar 18, 2020·ACS Applied Materials & Interfaces·Han Byul ChoiSteve Park
Jan 29, 2019·Chemical Reviews·Tyler R RayJohn A Rogers
Feb 20, 2019·ACS Applied Materials & Interfaces·Ting-Hsiang ChangPo-Yen Chen
Jul 11, 2019·ACS Applied Materials & Interfaces·Tingting ZhaoJianhua Zhang
Aug 28, 2021·Micromachines·Daekwang JungDonghee Son
Aug 27, 2021·Science and Technology of Advanced Materials·Chi Cuong Vu, Jooyong Kim
Sep 25, 2020·ACS Applied Materials & Interfaces·Hao GuanXiaoqing Wang
May 30, 2021·Advanced Healthcare Materials·Hong Pan, Tae-Woo Lee
Nov 3, 2020·Journal of Advanced Research·Ming ChengLi-Ya Zhu

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