Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 27-33.doi: 10.13475/j.fzxb.20200202407

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of colorimetric humidity sensor using polyacrylonitrile/CoCl2 nanofibers

SUN Qian1, KAN Yan1, LI Xiaoqiang1,2(), GAO Dekang2   

  1. 1. College of Textile Science and Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China
    2. Bosideng International Holding Co., Ltd., Changshu, Jiangsu 215532, China
  • Received:2020-02-13 Revised:2020-08-08 Online:2020-11-15 Published:2020-11-26
  • Contact: LI Xiaoqiang E-mail:lixiaoqiang@jiangnan.edu.cn

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Abstract:

Polyacrylonitrile(PAN)/CoCl2 composite nanofibers were prepared by electrospinning for colorimetric detection of ambient humidity. Scanning electron microscopy, Fourier infrared spectrometer and energy dispersive X-ray spectrometer were used to characterize and analyze the microstructure and surface morphology of the PAN/CoCl2 nanofibers. Ultraviolet-visible spectrophotometer was used to analyze the reflection spectra of the fiber under different humidity and saturated vapor atmosphere with different organic solvents, and the electrochemical workstation was used to test the response and recovery capacity of the sensor under different humidity environment. The results show that PAN/CoCl2 nanofibers are able to maintain their structural stability in strong acid and strong base solutions. The nanofibers change their color from blue to pink, when relative humidity changes from 11% to 98%. Furthermore, the color change process is reversible and the response and recovery speed is fast. Under the humidity environment of 11%-75%, electric current reaches 1 023 nA within 12 s. When the humidity is decreased to 11%, the electric current drops from 2 187 nA to 10 nA within 2 s, which has the ability of rapid response and recovery.

Key words: colorimetric humidity sensor, nanofiber, cobalt chloride, polyacrylonitrile, reflection spectrum

CLC Number: 

  • TS159

Fig.1

Preparation diagram of PAN/CoCl2 nanofiber colorimetric humidity sensor"

Fig.2

SEM images of PAN (a) and PAN/CoCl2 (b)nanofiber membranes(×10 000)"

Fig.3

EDS spectrua (a) and element distribution (b)of PAN/CoCl2 nanofiber membrane"

Fig.4

FT-IR spectra of PAN/CoCl2 nanofiber membranes in 11% and 98% relative humidity states"

Fig.5

Photograph (a) and ultraviolet-visible absorption spectra (b) of CoCl2/DMF and CoCl2/distilled water solution"

Fig.6

Reflectivity spectra of PAN/CoCl2 nanofiber membranes in different relative humidity"

Fig.7

(x, y) value of PAN/CoCl2 nanofiber membranes in different relative humidity"

Fig.8

Photographs of patterns based on PAN/CoCl2 nanofiber membranes at 11% and 98% relative humidity"

Fig.9

RGB distance variation of PAN/CoCl2 nanofiber membranes. (a) RGB distance change curve under different relative humidity; (b) RGB distance thermal stability curve"

Tab.1

(x,y) of PAN/CoCl2 nanofibers membrane under VOCs and relative humidity of 98%"

环境条件 (x,y) 环境条件 (x,y)
乙酸 (0.285 0,0.323 4) 乙醇 (0.281 8,0.324 2)
丙酮 (0.285 7,0.325 1) 甲苯 (0.282 5,0.324 5)
苯 (0.287 0,0.324 9) 二甲基亚砜 (0.284 9,0.324 1)
三氯甲烷 (0.283 1,0.322 1) 甲醛 (0.285 5,0.324 6)
N,N-二甲基
甲酰胺		 (0.285 3,0.324 4) 相对湿度
为98%环境		 (0.318 6,0.333 2)

Fig.10

Color images of PAN/CoCl2 nanofibers exposure to various VOCs and humidity of 98%. (a) Acetic acid;(b) Ethanol; (c) Acetone; (d) Methylbenzene;(e) Benzene; (f) DMSO;(g) Chloroform;(h) Methanol; (i) DMF; (j) RH 98%"

Fig.11

Dynamic response and recovery curves under different relative humidity(a)and humidity from 11% to 75% (b)"

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