Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (05): 38-45.doi: 10.13475/j.fzxb.20200804308

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of flexible and anisotropic strain sensor based on electrospinning

ZHANG Lin1, LI Zhicheng1, ZHENG Qinyuan1, DONG Jun2, ZHANG Yin3,4()   

  1. 1. Chien-Shiung WU College, Southeast University, Nanjing, Jiangsu 211189, China
    2. Department of Urology, Children's Hospital of Nanjing Medical University, Nanjing, Jiangsu 210008, China
    3. School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, China
    4. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu 211189, China
  • Received:2020-08-10 Revised:2021-01-15 Online:2021-05-15 Published:2021-05-20
  • Contact: ZHANG Yin E-mail:zhang@seu.edu.cn

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Abstract:

In order to detect the strain in a specific direction, aligned polyvinylidene fluoride (PVDF) nanofiber mats were fabricated via magnetic electrospinning and packaged in soft materials to prepare flexible and anisotropic strain sensors. The effects of electrospinning parameters on the morphology of nanofibers were studied. Raman spectroscopy was used to characterize the crystal form in PVDF nanofibers. The performances of flexible strain sensors and the feasibility of applying the sensor in monitoring ureteral peristalsis were tested. The experimental results show that PVDF nanofibers fabricated by an 11.5 kV voltage under 10 cm eletrospinning distance and 5 mL/h injection rate present uniform morphology and best alignment. The β phase is in the predominant crystal form in the PVDF nanofiber. Bending test shows that the sensor generates an obvious response signal for the bending perpendicular to the PVDF nanofiber, while the sensor is insensitive for the bending in parallel to the PVDF nanofiber. The work shows that the sensor performs good anisotropic detection sensitivity to strain.

Key words: polyvinylidene fluoride, flexible sensor, electrospinning, anisotropy, nanofiber, detection of ureteral peristalsis

CLC Number: 

  • TQ340.64

Fig.1

Schematic of electrospinning setup"

Fig.2

Schematic and physical pictures of flexible sensor structure. (a)Traditional flexible sensor;(b)Flexible anisotropic sensor;(c)Picture of sensor"

Fig.3

Disordered(a)and parallel(b) distributed PVDF nanofibers (×1 000)"

Fig.4

Optical microscope images of PVDF nanofibers with different voltages (×1 000)"

Fig.5

Optical microscope images of nanofibers with different eletrospinning distances (×1 000)"

Fig.6

Optical microscope images of PVDF nanofibers with different injection rates (×1 000)"

Fig.7

Strain response result of traditional flexible sensor. (a) Bending flexible sensor; (b) Corresponding voltage response"

Fig.8

Strain response of flexible and anisotropic strain sensor. (a) Bending flexible sensor; (b) Corresponding voltage response"

Fig.9

Schematic diagram of detection system(a)and picture of nephrostomy tube integrated with flexible sensor(b)"

Fig.10

Performance of nephrostomy tube integrated with flexible sensor. (a) Nephrostomy tube; (b) Corresponding voltage response"

Fig.11

Raman spectra of PVDF powder, disorderly PVDF nanofibers and parallel PVDF nanofibers"

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