Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (06): 51-56.doi: 10.13475/j.fzxb.20200805806

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of resistive flexible humidity sensors using electrospun carbon nanotubes

DAI Yang1,2(), YANG Nannan1, XIAO Yuan1,2   

  1. 1. College of Mechanical and Electrical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Xi'an Key Laboratory of Modern Intelligent Textile Equipment, Xi'an, Shaanxi 710048, China
  • Received:2020-08-12 Revised:2021-01-29 Online:2021-06-15 Published:2021-06-25

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Abstract:

In order to prepare a flexible humidity sensor with high sensitivity and more suitable for wearable use scenes, polyethylene terephthalate (PET) was used as a flexible substrate for making interdigital electrodes, and polyvinylpyrrolidone (PVP) and multi-walled carbon nanotubes (MWCNTs) were employed as the raw materials to prepare the spinning solution, and MWCNTs/PVP was deposited on a flexible PET substrate by electrospinning technology to make a flexible humidity sensor. The microstructure of the membrane was characterized and analyzed via the use of scanning electron microscopy, and the linearity, response/recovery time, repeatability and stability of the sensor were evaluated using the designed experimental devices. The results show that the output resistance of the flexible humidity sensor has a good linear relationship with the relative humidity, and the correlation coefficient is 0.97. The detectable relative humidity range is 40%-90%, the response time is 20 s, and the recovery time is 5 s. After 40 repeated measurements under 75% relative humidity, the sensor shows good repeatability and stability.

Key words: electrospinning, carbon nanotube, flexible wearable, humidity sensor, flexible substrate

CLC Number: 

  • TB32

Fig.1

PET substrate with interdigital electrodes"

Fig.2

Flexible humidity sensor"

Fig.3

Schematic diagram of a flexible humidity sensor"

Fig.4

Schematic diagram of humidity test system"

Fig.5

Schematic diagram of MWCNT adsorption mechanism based on PET substrate"

Fig.6

Simplified equivalent circuit diagram of MWCNTs"

Fig.7

SEM images of cross section and surface of flexible humidity sensor.(a) Cross section image (×1 000); (b) Surface image (×50 000)"

Fig.8

Relationship between resistance and relative humidity"

Fig.9

Sensing response curves of sodium chloride saturated salt solution(a), potassium chloride saturated salt solution (b)and clear water solution(c)"

Fig.10

Electrical signal response in environment of sodium chloride saturated salt solution"

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