3D Multiple Triangular Prisms for Highly Sensitive Non-Contact Mode Triboelectric Bending Sensors

Nanomaterials (Basel). 2022 Apr 28;12(9):1499. doi: 10.3390/nano12091499.

Abstract

Here, a highly sensitive triboelectric bending sensor in non-contact mode operation, less sensitive to strain, is demonstrated by designing multiple triangular prisms at both sides of the polydimethylsiloxane film. The sensor can detect bending in a strained condition (up to 20%) as well as bending direction with quite high linear sensitivity (~0.12/degree) up to 120°, due to the electrostatic induction effect between Al and poly (glycerol sebacate) methacrylate. Further increase of the bending angle to 135° significantly increases the sensitivity to 0.16/degree, due to the contact electrification between them. The sensors are attached on the top and bottom side of the proximal interphalangeal and wrist, demonstrating a directional bending sensor with an enhanced sensitivity.

Keywords: bidirectional bending sensor; less sensitive to strain; non-contact mode; self-powered sensor; triboelectric.

Grants and funding

This work was supported by the Samsung Research Funding Center of Samsung Electronics under Project Number SRFCTA1403–51, Republic of Korea.