Dual Mode Strain–Temperature Sensor with High Stimuli Discriminability and Resolution for Smart Wearables

Author:

Xiao Huiyun123,Li Shengbin123,He Zidong123,Wu Yuanzhao123,Gao Zhiyi123,Hu Chao2,Hu Siqi2,Wang Shengding123,Liu Chao24,Shang Jie123,Liao Meiyong5,Makarov Denys6,Liu Yiwei123ORCID,Li Run‐Wei123

Affiliation:

1. CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China

2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China

3. University of Chinese Academy of Sciences Beijing 100049 P. R. China

4. School of Material Chemistry Ningbo University Ningbo Zhejiang 315201 P. R. China

5. National Institute for Materials Science 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

6. Helmholtz‐Zentrum Dresden‐Rossendorf e.V Institute of Ion Beam Physics and Materials Research Bautzner Landstrasse 400 01328 Dresden Germany

Abstract

AbstractStrain and temperature are important physiological parameters for health monitoring, providing access to the respiration state, movement of joints, and inflammation processes. The challenge for smart wearables is to unambiguously discriminate strain and temperature using a single sensor element assuring a high degree of sensor integration. Here, a dual‐mode sensor with two electrodes and tubular mechanically heterogeneous structure enabling simultaneous sensing of strain and temperature without cross‐talk is reported. The sensor structure consists of a thermocouple coiled around an elastic strain‐to‐magnetic induction conversion unit, revealing a giant magnetoelastic effect, and accommodating a magnetic amorphous wire. The thermocouple provides access to temperature and its coil structure allows to measure impedance changes caused by the applied strain. The dual‐mode sensor also exhibits interference‐free temperature sensing performance with high coefficient of 54.49 µV °C−1, low strain and temperature detection limits of 0.05% and 0.1 °C, respectively. The use of these sensors in smart textiles to monitor continuously breathing, body movement, body temperature, and ambient temperature is demonstrated. The developed multifunctional wearable sensor is needed for applications in early disease prevention, health monitoring, and interactive electronics as well as for smart prosthetics and intelligent soft robotics.

Funder

National Natural Science Foundation of China

K. C. Wong Education Foundation

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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