MWCNT/Nafion/MWCNT复合材料的湿度传感性能研究

doi:10.11896/cldb.21060183

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Abstract The development of new humidity sensors is of great importance to meet the industrial and agricultural humidity detection. As a key component of a humidity sensor, the humidity-sensitive material directly affects the performance of the sensor.Ionic polymer-metal-composite (IPMC) can be used as a new type of flexible sensor. The movable ions inside the ionomer will undergo directional migration to form a potential difference under the action of external dynamic humidity, thereby generating an electrical signal. Because of excellent humidity-sensing properties, IPMC sensors have attracted increasing attention in the field of precision monitoring of ambient humidity. However, the electrode layer of the existing IPMC sensors is dense, which makes it difficult for quickly exchange humidity with the external environment. In addition, the weak adhesion between the electrode layer and the ionomer membrane causes the electrode to fall off easily. In order to solve the problem that the electrode layer is too dense, multi-walled carbon nanotubes (MWCNT), polyvinylidene fluoride (PVDF-HFP) and ionic liquids (ILs) have been used to cast the composite electrode layer with microporous structure for quickly exchange humidity with the external environment. Meanwhile, a binder with ion transport ability has been used between the electrode layer and ionomer membrane to enhance the bonding strength of the electrode during the thermoforming process.
This work developed a new kind of ionic polymer (MWCNT/Nafion/MWCNT) composite for humidity sensitive film. Firstly, the multiwalled carbon nanotubes/polyvinylidene fluoride/ionic liquid (MWCNT/PVDF-HFP/ILs) electrode layer and perfluorinated sulfonic acid-polytetrafluoroethy-lene/ionic liquid (Nafion/ILs) electrolyte layer were prepared via solution casting method. The MWCNT/Nafion/MWCNT composite film with humidity sensitive properties was assembled by hot-pressing a Nafion/ILs electrolyte layer between two MWCNT/PVDF-HFP/ILs electrode films. Subsequently, the microstructure and electrochemical characteristics of the composite film were characterized by using scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance (EIS), respectively. And the humidity-voltage responses, the humidity sensitivity characteristics and mechanism of the composite film under various humidity conditions were tested systematically. The results show that as the relative humidity ranges from 0%RH and 100%RH, the fastest response time and fastest recovery time of the humidity sensing film are 17 s and 58 s, respectively. The sensitivity of electrical response is 0.14 mV/%RH, and the response rate is up to 0.277 mV/s. Finally, the potential applications of the humidity sensing film in respiration detection, dam seepage detection and other scenarios were investigated and demonstrated.

Key words： humidity sensing multiwalled carbon nanotubes Nafion ionic liquid

Published: Online: 2022-10-26

CLC number:

TB332

Fund:National Key R & D Plan ‘Intelligent Robot’ Key Project (2020YFB1312900), the National Natural Science Foundation of China (51975184), Central University Business Fee Project(B210202124, B200202179), National Postdoctoral Natural Science Foundation of China (2019M661706), and Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX21_0466).

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	WANG Yanjie
	ZHAO Shijie
	SHENG Junjie
	RU Jie
	ZHAO Chun
	LI Shuyong

Cite this article:

WANG Yanjie,ZHAO Shijie,SHENG Junjie, et al. Humidity Sensing Performance of MWCNT/Nafion/MWCNT Composites[J]. Materials Reports, 2022, 36(20): 21060183-9.

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http://www.mater-rep.com/EN/10.11896/cldb.21060183 OR http://www.mater-rep.com/EN/Y2022/V36/I20/21060183

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