Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (07): 62-68.doi: 10.13475/j.fzxb.20200807708

• Fiber Materials • Previous Articles     Next Articles

Strain sensing performance for thin and aligned carbon nanofiber membrane

YAN Tao1,2, PAN Zhijuan1,2()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215021, China
    2. National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
  • Received:2020-08-18 Revised:2021-03-30 Online:2021-07-15 Published:2021-07-22
  • Contact: PAN Zhijuan E-mail:zhjpan@suda.edu.cn

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Abstract:

Aiming for the monitoring of human body movement and physiological information, a thin and aligned carbon nanofiber membrane (CNFM) was prepared by using the electrospinning method, and a flexible strain sensor was developed. The structures and performances of nanofiber membranes were analyzed, and the influence of thickness and width of CNFM and the alignment of carbon nanofiber (CNF) on sensing performance was discussed. The results exhibit that the aligned degree of polyacrylonitrile/graphene composite nanofibers and the transmittance of CNFM could reach 61.3% and 48%, respectively. When the stretching direction was parallel to the aligned direction of CNF, the strain range of the sensor firstly decreases and then increases with the increase of the alignment of CNF, and gradually increases with the increase of the thickness and width of CNFM. When the stretching direction was perpendicular to the CNF orientation direction, the strain range of the sensor is significantly increased, but sensitivity is decreased. The ultra-thin transparent flexible strain sensor can be attached to the skin surface to detect the motion information caused by human joint movement, and physiological information such as pulse and vocal-cord vibration. It can also be applied in the fields of smart clothing and subtle deformation monitoring.

Key words: electrospinning, carbon nanofiber membrane, flexible strain sensor, sensing performance, smart wearable device

CLC Number: 

  • TP212.1

Fig.1

Physical image of sensor"

Fig.2

SEM images of PAN/graphene composite nanofiber membranes under different rotational speeds"

Fig.3

Diameter and alignment of PAN/grapheme composite nanofibers under different rotational speeds"

Fig.4

Transmittance of CNFM under different electrospun times"

Fig.5

Sensing performance of strain sensor. (a) Cyclic stress-strain curve; (b) Curve of strain and relative change in resistance; (c) Cyclic curves of strain and relative change in resistance under strain of 10%"

Fig.6

Curves of strain and relative change in resistance under different conditions. (a) Different electrospun times;(b) Different rotational speeds; (c) Different width of CNFM"

Fig.7

Strain and relative resistance curves of sensor when orientation direction of CNF is perpendicular to drawing direction"

Fig.8

Structural change of CNFM during stretching at different stress. (a) Orientation direction of CNF is parallel to stretching direction; (b) Orientation direction of CNF is perpendicular to stretching direction"

Fig.9

Practical application performance of sensor. (a) Pulse before and after exercise;(b) Bending of index finger; (c) Sound waves with different frequency"

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