Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 47-54.doi: 10.13475/j.fzxb.20210403408

• Textile Engineering • Previous Articles     Next Articles

Preparation of cotton/Ti3C2 conductive yarn and performance of pressure capacitance sensor

ZHAO Boyu, LI Luhong, CONG Honglian()   

  1. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2021-04-12 Revised:2022-04-13 Online:2022-07-15 Published:2022-07-29
  • Contact: CONG Honglian E-mail:cong-wkrc@163.com

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Abstract:

The paper aims to explore the combination effect of two-dimensional transition metal carbide/nitride(MXene) and natural fibers so as to devise capacitive flexible sensing fabric with a simplified preparation process by knitting. In the experiment, a new two-dimensional transition metal carbide Ti3C2 was used as the conductive material, and cotton yarn as matrix fiber to achieve the continuous preparation of conductive yarns. A cross structure capacitive pressure sensor was designed with a flat-knitting spacer fabric as dielectric layer and conductive yarns as electrodes. The effects of treatment time on the micro morphology, bonding effect and electrical conductivity of the yarns were studied, and the mechanical properties and capacitance characteristics of the pressure sensor were analyzed. The experimental results show that the conductivity of the composite yarn of Ti3C2 material and cotton yarn reach 0.872 S/cm. The prepared sensor has good compression recovery, and remarkable capacitance characteristics. The highest sensitivity is 0.028 kPa-1, the response time is less than 150 ms, demonstrating durability and stability of the sensor after 200 compression cycles.

Key words: two-dimensional transition metal carbide, conductive yarn, flat-knitted spacer fabric, capacitive sensor, flexible sensor

CLC Number: 

  • TS184.1

Fig.1

Preparation process of composite conductive yarn"

Fig.2

Knitting diagram of spacing structure"

Fig.3

Image of cross capacitor structure"

Fig.4

Compression test principle diagram of capacitive sensor"

Fig.5

SEM images of cotton and conductive yarns (×1 000). (a) Untreated cotton yarn;(b) Yarn treated for 1 min; (c) Yarn treated for 5 min;(d) Yarn treated for 10 min; (e) Yarn treated for 20 min;(f) Yarn treated for 30 min"

Fig.6

Effect of treatment time on weight gain rate of composite conductive yarn"

Fig.7

FT-IR spectra of Ti3C2, cotton and Ti3C2-CY yarns"

Fig.8

XRD patterns of Ti3C2, cotton and Ti3C2-CY yarns"

Fig.9

Effect of treatment time on resistance of conductive yarn"

Fig.10

Effect of treatment time on retention rate of electrical conductivity of conductive yarn"

Fig.11

Compression-recovery properties of fabric under different pressures"

Fig.12

Compression-recovery properties of fabric at 200 cycles strain"

Fig.13

Stress-capacitance variation characteristics of pressure capacitance sensor"

Fig.14

Response time of pressure capacitance sensors"

Fig.15

Capacitance behavior of sensor for loading and unloading of various pressures"

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