Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (04): 146-153.doi: 10.13475/j.fzxb.20240406501

• Dyeing and Finishing Engineering • Previous Articles     Next Articles

Preparation and application of chitosan-modified conductive fabrics in human posture monitoring

DONG Zijing1,2(), WU Xinyuan1,2, WANG Ruixia1,2, ZHAO Huaxiang3, QIAN Lijiang3, YING Chengwei3, SUN Runjun1,2   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Key Laboratory of Functional Textile Material and Product (Xi'an Polytechnic University), Ministry of Education, Xi'an, Shaanxi 710048, China
    3. Zhejiang Shaoxing Yongli Printing and Dyeing Co., Ltd., Shaoxing, Zhejiang 312073, China
  • Received:2024-04-25 Revised:2024-08-14 Online:2025-04-15 Published:2025-06-11

Abstract:

Objective In the actual application process, it is found that the carbon material is easy to agitate on the surface of the fabrics, resulting in the uneven coating of the material on the surface of the fabrics, affecting the sensing performance of the flexible sensor, and greatly limiting the application of such materials. The purpose of this study is to improve the uniformity of carbon conductive filling material on fabrics, improve the sensitivity of strain sensor and develop a sensor for detecting human movement.

Method Carbon black(CB) conductive knitted fabrics modified by chitosan was prepared by an impregnation method using pure cotton knitted fabrics as matrix material. The surface morphology and structure of the samples were analyzed by a scanning electron microscope and Fourier infrared spectroscopy. The tensile strain sensitivity and stability of the samples were measured by a ZH-T0 8-channel resistance measurement module combined with fabrics strength machine.

Results By Fourier infrared spectroscopy and scanning electron microscopy testing of the prepared conductive fabric, it can be observed that CB has been deposited on the fabric, and the CS modified material is uniformly deposited. According to the stress-strain curves of the fabric and the conductive fabric during the tensile process, it can be seen that the sample PCKF/CS/CB-4.0 has good mechanical properties. According to the strain-resistance curve of the fabric, the resistance change of the sample PCKF/CS/CB-4.0 can reach 332.37%, and the sensitivity can reach 5.5. Through the stability test of the fabric, it has good resilience and good repeatability. Finally, the application test can meet the needs of human motion monitoring.

Conclusion On the basis of chitosan modified pure cotton knitted fabric, chitosan modified carbon black conductive knitted fabric was prepared. When the modified carbon black content is 4.0%, the maximum resistance change rate of the sample can reach 332.37%, and the sensitivity is 5.5, which is 183.3% and 175% higher than that of the unmodified carbon black at the same concentration. The resistance and resistance change rate of PCKF/CS/CB-4.0 at different temperatures are tested, and the results show that PCKF/CS/CB-4.0 can be used stably over a wide temperature range. Through the stability test of PCKF/CS/CB-4.0, it can be concluded that the conductive fabric not only has good sensitivity, but also has good repeatability and stability. The prepared chitosan modified carbon black pure cotton knitted fabric can be used as a sensor to monitor human motion.

Key words: carbon black, chitosan, conductive fabric, tensile strain property, human posture monitoring, fabric sensor

CLC Number: 

  • TS111.8

Tab.1

Samples and partial experimental parameters"

样品编号 是否经过壳
聚糖(CS)
改性
是否经过
炭黑(CB)
整理
炭黑(CB)分
散液质
量分数/%
PCKF
PCKF/CS
PCKF/CB
PCKF/CB-1.0 1.0
PCKF/CB-2.0 2.0
PCKF/CB-3.0 3.0
PCKF/CB-4.0 4.0
PCKF/CS/CB
PCKF/CS/CB-0.5 0.5
PCKF/CS/CB-1.0 1.0
PCKF/CS/CB-2.0 2.0
PCKF/CS/CB-3.0 3.0
PCKF/CS/CB-4.0 4.0

Fig.1

Infrared spectra of PCKF and PCKF/CS/CB-4.0"

Fig.2

SEM images of PCKF/CS/CB-4.0 and PCKF/CB-4.0"

Fig.3

Stress-strain curve and cyclic tensile stress-strain curve of fabric. (a) Stress-strain curve of pure cotton fabric base; (b) Stress-strain curve of PCKF/CB-4.0; (c) Stress-strain curve of PCKF/CS/CB-4.0; (d) Cyclic tensile stress-strain curve of PCKF/CS/CB-4.0"

Fig.4

Strain-resistance curve of sample"

Fig.5

Diagram of crack generation"

Fig.6

Resistance and resistance change rate at different temperatures(a) and test diagram (b) of PCKF/CS/CB-4.0"

Fig.7

Fast response time and response time of PCKF/CS/CB-4.0"

Fig.8

PCKF/CS/CB-4.0 cyclic tensile test result at different frequencies"

Fig.9

PCKF/CS/CB-4.0 cyclic tensile test result at different tensile percentage"

Fig.10

PCKF/CS/CB-4.0 resistance change rate at 1 000 cycles"

Fig.11

Resistance change rate of strain sensor under bending of finger (a) and knee (b)"

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