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Research Article

Graphene aerogel-based vibration sensor with high sensitivity and wide frequency response range

Zibo Wang1,2Zhuojian Xiao1,2Jie Mei1,2Yanchun Wang1,4Xiao Zhang1,2,3,4Xiaojun Wei1,2,3,4Huaping Liu1,2,3,4Sishen Xie1,2,3,4Weiya Zhou1,2,3,4( )
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences and College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Songshan Lake Materials Laboratory, Dongguan 523808, China
Beijing Key Laboratory for Advanced Functional Materials and Structure Research, Beijing 100190, China
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Graphical Abstract

The graphene aerogel-based accelerometer is capable of detecting not only static pressure, but also vibrations in a wide frequency range of 2 Hz−10 kHz. With no hysteresis, excellent repeatability, high cycle stability and marked linearity, it is expected to meet the broader functional requirements of related fields in practical applications.

Abstract

Compared with piezoresistive sensors, pressure sensors based on the contact resistance effect are proven to have higher sensitivity and the ability to detect ultra-low pressure, thus attracting extensive research interest in wearable devices and artificial intelligence systems. However, most studies focus on static or low-frequency pressure detection, and there are few reports on high-frequency dynamic pressure detection. Limited by the viscoelasticity of polymers (necessary materials for traditional vibration sensors), the development of vibration sensors with high frequency response remains a great challenge. Here, we report a graphene aerogel-based vibration sensor with higher sensitivity and wider frequency response range (2 Hz–10 kHz) than both conventional piezoresistive and similar sensors. By modulating the microscopic morphology and mechanical properties, the super-elastic graphene aerogels suitable for vibration sensing have been prepared successfully. Meanwhile, the mechanism of the effect of density on the vibration sensor’s sensitivity is studied in detail. On this basis, the sensitivity, signal fidelity and signal-to-noise ratio of the sensor are further improved by optimizing the structure configuration. The developed sensor exhibits remarkable repeatability, excellent stability, high resolution (0.0039 g) and good linearity (non-linearity error < 0.8%) without hysteresis. As demos, the sensor can not only monitor low-frequency physiological signals and motion of the human body, but also respond to the high-frequency vibrations of rotating machines. In addition, the sensor can also detect static pressure. We expect the vibration sensor to meet a wider range of functional needs in wearable devices, smart robots, and industrial equipment.

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Nano Research
Pages 11342-11349
Cite this article:
Wang Z, Xiao Z, Mei J, et al. Graphene aerogel-based vibration sensor with high sensitivity and wide frequency response range. Nano Research, 2023, 16(8): 11342-11349. https://doi.org/10.1007/s12274-023-5802-z
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Received: 11 April 2023
Revised: 29 April 2023
Accepted: 02 May 2023
Published: 14 June 2023
© Tsinghua University Press 2023
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