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Carbon fibre (CF) embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain gauge. To further improve the sensitivity of CF/PDMS composite strain sensor, the relatively low temperature prepared TiO2 nanowire via hydrothermal route was employed herein to functionalize CF. The results showed a significant increase in the sensitivity of the TiO2@CF/PDMS composite strain sensors which was reflected by the calculated gauge factor. As the prepared TiO2 nanowire vertically embraced the surroundings of the CF, the introduced TiO2 nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain sensors. Moreover, the significant strain rate dependent behavior of TiO2@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain rate. Therefore, introducing TiO2 nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.


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Significant strain-rate dependence of sensing behavior in TiO2@carbon fibre/PDMS composites for flexible strain sensors

Show Author's information Fan ZHANGaHailong HUb,c( )Simin HUbJianling YUEb
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
School of Aeronautics & Astronautics, Central South University, Changsha 410083, China
Research Center in Intelligent Thermal Structures for Aerospace, Central South University, Changsha 410083, China

Abstract

Carbon fibre (CF) embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain gauge. To further improve the sensitivity of CF/PDMS composite strain sensor, the relatively low temperature prepared TiO2 nanowire via hydrothermal route was employed herein to functionalize CF. The results showed a significant increase in the sensitivity of the TiO2@CF/PDMS composite strain sensors which was reflected by the calculated gauge factor. As the prepared TiO2 nanowire vertically embraced the surroundings of the CF, the introduced TiO2 nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain sensors. Moreover, the significant strain rate dependent behavior of TiO2@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain rate. Therefore, introducing TiO2 nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.

Keywords:

composites, dependence of strain rate, sensitivity, flexible strain sensors
Received: 15 February 2021 Revised: 03 June 2021 Accepted: 24 June 2021 Published: 27 September 2021 Issue date: December 2021
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Publication history
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Acknowledgements
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Publication history

Received: 15 February 2021
Revised: 03 June 2021
Accepted: 24 June 2021
Published: 27 September 2021
Issue date: December 2021

Copyright

© The Author(s) 2021

Acknowledgements

The research was supported by the Start-Up Funds for Outstanding Talents in Central South University through Project Nos. 202045007 and 202044017. Moreover, the authors would like to appreciate the assistance from Dr. Yin Yao for the help of SEM characterisation.

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