Highly Sensitive Tactile Shear Sensor Using Spatially Digitized Contact Electrodes

Author:

Choi EunsukORCID,Hwang Soonhyung,Yoon Yousang,Seo Hojun,Lee Jusin,Yeom Seongoh,Ryu Gunwoo,Yang Heewon,Kim Sunjin,Sul Onejae,Lee Seung-Beck

Abstract

In this article, we report on a highly sensitive tactile shear sensor that was able to detect minute levels of shear and surface slip. The sensor consists of a suspended elastomer diaphragm with a top ridge structure, a graphene layer underneath, and a bottom substrate with multiple spatially digitized contact electrodes. When shear is applied to the top ridge structure, it creates torque and deflects the elastomer downwards. Then, the graphene electrode makes contact with the bottom spatially digitized electrodes completing a circuit producing output currents depending on the number of electrodes making contact. The tactile shear sensor was able to detect shear forces as small as 6 μN, detect shear direction, and also distinguish surface friction and roughness differences of shearing objects. We also succeeded in detecting the contact slip motion of a single thread demonstrating possible applications in future robotic fingers and remote surgical tools.

Funder

the Nano Material Technology Development Program through NRF funded by the Ministry of Education.

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

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