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SCIENCE CHINA Materials, Volume 62, Issue 4: 555-565(2019) https://doi.org/10.1007/s40843-018-9348-8

Stretchable and multifunctional strain sensors based on 3D graphene foams for active and adaptive tactile imaging

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  • ReceivedJun 23, 2018
  • AcceptedSep 1, 2018
  • PublishedSep 25, 2018

Abstract

The highly developed flexible electronics puts forward higher requirements for the stretchable strain sensors with excellent multiple performances. Herein, a simple and economical fabrication strategy is adopted to obtain a new strain sensor based on Ecoflex rubbers, three-dimensional (3D) graphene foams (GrF) and modified silicone rubber (MSR). The device possesses high stretchability (tolerable strain up to 100%) with a variety of capabilities, such as pressure and strain sensing, strain visualization and strain-controlled heating. The GrF with excellent electrical property and MSR with ideal mechanical property endow the sensor with a wide sensing range (up to 100% strain and 66 kPa stress), high sensitivity (gauge factor of 584.2 within the strain range of 80%–100% and sensitivity of 0.183 kPa−1 in 5–10 kPa) and long cycle life (more than 10,000 cycles) for pressure/strain sensing. In addition, the temperature of the device can be increased 35°C in 5 min under 5 V. Based on this, the deformation is visible to the naked eyes by the color conversion of thermochromic MSR. The soft and reversible strain sensor can be served as the electronic skin (e-skin) for real-time and high accuracy detecting of electrophysiological stimuli, a wearable heater for thermotherapy or body warming and even intelligent visual-touch panel.


Funded by

the National Natural Science Foundation of China(51572025)

the National Foundation of China(41422050303)

the Program of Introducing Talents of Discipline to Universities(B14003)

Beijing Municipal Science & Technology Commission and the Fundamental Research Funds for Central Universities.


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51572025), the National Foundation of China (41422050303), the Program of Introducing Talents of Discipline to Universities (B14003), Beijing Municipal Science &Technology Commission and the Fundamental Research Funds for Central Universities.


Interest statement

The authors declare no conflict of interest.


Contributions statement

The manuscript was written by Xu M with support from all authors. All authors have given approval to the final version of the manuscript.


Author information

Minxuan Xu received her PhD degree from the Department of Materials Science, University of Science & Technology Beijing in 2018. She joined the School of Materials and Environmental Engineering at Hangzhou Dianzi University, China as a lecturer in 2018. Her current research focuses on materials and devices for flexible and smart electronics.


Junjie Qi is a full Professor of the University of Science & Technology Beijing, China. She received her PhD degree from the Department of Materials Science at University of Science & Technology Beijing in 2002. She has published more than 100 peer review papers. Her current research interest includes the semiconductor nanomaterials, electronic/opto-electronics and the devices of low-dimensional materials.


Supplement

Supplementary information

Experimental details and supplementary data are available in the online version of the paper.


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  • Figure 1

    Preparation and characterization of the stretchable strain sensor based on MSR/GrF/Ecoflex composite. (a) Schematic illustration of the strain sensor. (b) Photograph of a torsional strain sensor. (c) Raman shift of pure Ecoflex, pure GrF before and after etching, and the composite of the two. (d) Optical image of the cross-section of the strain sensor. (e) SEM image of the GrF after etching. (f) SEM image of the upper MSR layer.

  • Figure 2

    Application of the multifunctional device as compressive stress detection. (a) Current-voltage of the strain sensor under different applied pressure. (b) Sensitivities of strain sensor during the pressure from 0 to 40 kPa. (c) Multiple-cycle tests of change in resistance with different applied pressure. (d) Real-time fast response and release of the strain sensor upon 9 kPa pressure. (e) Cycling stability test of strain sensor under repeated applied pressure of 9 kPa for 10,000 cycles (1.2 s for each cycle).

  • Figure 3

    Application of the multifunctional device as tensile strain detection. (a) Typical relative resistance-strain curve of a strain sensor within 100% strain; the inset shows the curve within 60% strain. (b) The time-resistance curves for repeated step-by-step stretching at different rates. (c) Variation of the resistance of the MSR/GrF/Ecoflex composite with the strain of 10% under different strain rates from 180% min−1 to 450% min−1. (d) Reliability test of the sensor under repeated cycles of stretching and releasing at different values with partial enlarged details in insets. (e) Recognition of three songs (60 dB) played by mobile phone for the strain sensor (the green curves in the background panels are the sound wave profiles). (f) Zoomed signals of the sensor corresponding to the same vibration audio at different decibels (60, 80, and 100 dB).

  • Figure 4

    Application of the multifunctional device in human motion detection. (a) Real-time and in situ AWPs measurement with the skin-attachable strain sensor attached on the wrist. The inset shows the zoomed waveform. (b) Measurement of JVPs with strain sensors attached on the neck. The inset is the zoomed waveform. (c) Relative resistance changes versus time for the strain sensor during breathing. (d) Relative resistance changes versus time for the strain sensor during saliva swallowing.

  • Figure 5

    Application of the multifunctional device in strain-controlled heater. (a) Schematic of measurement setup. (b) Relative electrical resistance of the strain sensor and temperature curve with time. (c) Heating behavior of the MSR/GrF/Ecoflex composite under various working voltages (the inset is the photographs). (d) Temperature-time curves of the MSR/GrF/Ecoflex composite under various strain states.

  • Figure 6

    Application of the multifunctional device in strain visualization. (a) Real-time temperature changes corresponding to various applied strains, each maintained for 5 min. (b) The strain distribution for “Loading” and “Unloading” compress applied of balls with different position. (c) Relative resistance changes for the stretchable panel in writing process of “USTB”. (d) Relative resistance changes for the stretchable panel in writing process of “NANO”. The insets are the photographs, respectively.

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