Ultrasensitive, Highly Stable, and Stretchable Strain Sensor Using Gated Liquid Metal Channel

Author:

Yao Bin1ORCID,Lü Xiaozhou1ORCID,Wang Yanwei1,Bai Nini1,Chen Congyi1,Wang Shaowei2,Su Haijun3ORCID,Zhang Yunke4

Affiliation:

1. School of Aerospace Science and Technology Xidian University Xi'an 710071 China

2. State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China

3. State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

4. Sino‐German College of Intelligent Manufacturing Shenzhen Technology University Shenzhen 518118 China

Abstract

AbstractDeveloping stretchable strain sensors with high sensitivity and stability is crucial for various applications such as prosthetic hands, human health monitoring, and human‐machine interactions. However, achieving these qualities simultaneously remains challenging. Here, an inherently stretchable strain sensor is presented that integrates ultrahigh sensitivity and robust stability, enabling stretch, press, or bend sensing capabilities. This sensor employs a softer elastomeric channel filled with liquid metal (LM) as the conductive path. A stiffer elastomer convex integrated into the channel serves as a strain‐manipulated gate, controlling opening gap of electrical current flow path. During deformation, the softer elastomer undergoes cross sectional reduction due to the Poisson effect, while the stiffer convex gate retains its geometry. This heterogeneous deformation behavior leads to significant contraction or closure of the LM channel, resulting in increased resistance and a remarkable enhancement in sensitivity by more than two orders of magnitude. The all‐soft design maintains exceptional stability even under extended or repetitive substantial deformations. With the ability to monitor subtle and large human body movements, detect grip actions of soft grippers reliably, and monitor the gradual and extended growth process of plants, this sensor holds significant potential for advancements in flexible electronics.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

State Key Laboratory of Solidification Processing

Basic and Applied Basic Research Foundation of Guangdong Province

Publisher

Wiley

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1. What Exactly Can Bionic Strategies Achieve for Flexible Sensors?;ACS Applied Materials & Interfaces;2024-07-20

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