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Piezoelectric Polyacrylonitrile Nanofiber Film-Based Dual-Function Self-Powered Flexible Sensor

Gengrui Zhao, Xiaodi Zhang, Xin Cui, Shu Wang, Zhirong Liu, Lin Deng, Anhui Qi, Xiran Qiao, Lijie Li Orcid Logo, Caofeng Pan, Yan Zhang, Linlin Li

ACS Applied Materials & Interfaces, Volume: 10, Issue: 18, Pages: 15855 - 15863

Swansea University Author: Lijie Li Orcid Logo

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DOI (Published version): 10.1021/acsami.8b02564

Abstract

To meet the growing demands in flexible and wearable electronics, various sensors have been designed for detecting and monitoring the physical quantity changes. However, most of these sensors can only detect one certain kind of physical quantity based on a single mechanism. In this paper, we have fa...

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Published in: ACS Applied Materials & Interfaces
ISSN: 1944-8244 1944-8252
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa39434
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Abstract: To meet the growing demands in flexible and wearable electronics, various sensors have been designed for detecting and monitoring the physical quantity changes. However, most of these sensors can only detect one certain kind of physical quantity based on a single mechanism. In this paper, we have fabricated a multifunctional sensor made from carbonized electrospun polyacrylonitrile/barium titanate (PAN-C/BTO) nanofiber film. It can detect two physical quantities (pressure and curvature), independently and simultaneously, by integrating piezoresistive, piezoelectric, and triboelectric effects. For flex sensing with the impedance change of PAN-C/BTO nanofiber films during bending, it had a sensitivity of 1.12 deg–1 from 58.9° to 120.2° and a working range of 28°–150°. For self-powered force sensing, it had a gauge factor of 1.44 V·N–1 within the range of 0.15–25 N. The sensor had a long stability over 60 000 cycles at both sensing modes. The inclusion of barium titanate nanoparticles (BTO NPs) into the nanofiber film had an over 2.4 times enhancement of sensitivity for pressure sensing because of the synergy of piezoelectric and triboelectric effects. On the basis of multifunction and modularity, a series of potential applications of the sensor were demonstrated, including sensing human’s swallowing, walking gaits, finger flexure, and finger-tapping. The self-powered flexible dual-mode sensor has great application potential in human-computer interactive and smart wearable sensing systems.
Keywords: electrospinning; flexible sensor; piezoelectric effect; self-powered; triboelectric nanogenerator
College: Faculty of Science and Engineering
Issue: 18
Start Page: 15855
End Page: 15863

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