Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (05): 79-83.doi: 10.13475/j.fzxb.20200902105

• Textile Engineering • Previous Articles     Next Articles

Preparation of flexible sensor with composite dielectric layer of cotton fabric/polydimethylsiloxane

XIAO Yuan1,2(), LI Hongying1, LI Qian1, ZHANG Wei1, YANG Pengcheng1   

  1. 1. College of Mechanical and Electrical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Xi'an Key Laboratory of Modern Intelligent Textile Equipment, Xi'an, Shaanxi 710048, China
  • Received:2020-09-09 Revised:2021-02-08 Online:2021-05-15 Published:2021-05-20

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Abstract:

In order to solve the existing problems such as complex process and high cost in the preparation of fabric-based flexible pressure sensors, a new method was proposed for preparing a fabric-based capacitive flexible pressure sensor by affixing equal width interdigital copper foil on both sides of the plain woven cotton fabric and encapsulating the assembly using polydimethylsiloxane (PDMS). The microscopic morphology of the cross-section of the sensor array unit was observed, and the sensor performances were tested. Experiment results show that it has a special microstructure composite dielectric layer formed by PDMS coated fabric fibers, and its sensitivities are about 8.66×10-3, 0.94×10-3 and 0.43×10-3 kPa-1 under pressures of 0-0.75, 0.75-125 and 125-580 kPa respectively. The maximum detectable limit of the sensor can reach 580 kPa, whose maximum hysteresis is about 5.5%, and the sensor demonstrates good repeatability and stability. The flexibility and tactile testing show that it can clearly recognize and feedback the process of bending with different angles and intermittent finger pressing.

Key words: smart textiles, fabric-based capacitive sensor, flexible sensor, polydimethylsiloxane, dielectric layer of composite microstructure

CLC Number: 

  • TP212

Fig.1

Schematic diagram of working principle of sensor"

Fig.2

Flowchart of sensor preparation process"

Fig.3

Microstructure of sensor cross-section of fabric/PDMS composite structure. (a) Sensor cross-sectional; (b) Partial enlarged view of dielectric layer"

Fig.4

Sensor sensitivity test"

Fig.5

Sensor hysteresis"

Fig.6

Sensor repeatability"

Fig.7

Sensor stability. (a) 100 cycles test; (b) Partial enlarged view of loop test"

Fig.8

Application test result of sensor. (a) Bending; (b) Touch pressure"

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