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The organic-inorganic hybrid colorimetric humidity sensor which can obtain environmental humidity by electrical signals and color changes has broad application prospects in the field of humidity monitoring because of its high feature color discrimination, excellent stability, and simple preparation process. However, its long response-recovery time is generally not conducive to real-time humidity monitoring. In this paper, nanometer silica particles are doped into polyimide(PI)-nickel(II) iodide(NiI2) organic-inorganic hybrid materials to fabricate PI-SiO2/NiI2 composite films and colorimetric humidity sensors. Then their surface morphologies and humidity sensing properties are studied. It is found that PI-SiO2/NiI2 film possesses a honeycomb-like surface morphology, the humidity sensitivity of PI-SiO2/NiI2 colorimetric humidity sensor is better than that of other NiI2 based humidity sensors, its characteristic color is distinct in a range of 11%–97% RH humidity, and the humidity response time of the PI-SiO2/NiI2 colorimetric humidity sensor is less than 1.5 s, and the recovery time is less than 18 s. The research result indicates that the doping of nanometer silica particles can effectively improve response-recovery properties of the organic-inorganic hybrid colorimetric humidity sensor, which is helpful in improving the performance of the sensor.
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Keywords:
- colorimetric humidity sensor /
- organic-inorganic hybrid /
- PI-SiO2/NiI2 /
- response-recovery properties
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图 1 湿敏测试系统示意图
Figure 1. Schematic diagram of humidity sensitive test system.
图 2 PI-SiO2/NiI2粉末样品在不同气氛下的TG-DTG曲线 (a) 空气气氛; (b) 氮气气氛
Figure 2. TG/DTG curve of powdered samples of PI-SiO2/NiI2 in different atmospheres: (a) Air atmosphere; (b) N2 atmosphere.
图 3 不同薄膜的表面形貌 (a) NiI2; (b) PI-NiI2; (c) PI-SiO2/NiI2
Figure 3. The surface morphology of different films: (a) NiI2; (b) PI-NiI2; (c) PI-SiO2/NiI2.
图 4 PI-SiO2/NiI2薄膜中的Ni, I, Si元素分布情况
Figure 4. Distribution of Ni, I and Si elements in PI-SiO2/NiI2 thin films.
图 5 (a), (b) PI-SiO2/NiI2比色湿度传感器在11%和97% RH的湿度环境中的响应恢复曲线
Figure 5. (a), (b) Response recovery curve of PI-SiO2/NiI2 colorimetric humidity sensor in the humidity environment of 11% and 97% RH.
图 6 (a) PI-SiO2/NiI2比色湿度传感器的动态湿度响应曲线; (b) PI-SiO2/NiI2比色湿度传感器在11%—97% RH的湿度范围内的长期稳定性测试; (c) PI-SiO2/NiI2比色湿度传感器湿滞曲线图
Figure 6. (a) Dynamic humidity response curve of PI-SiO2/NiI2 humidity sensor under various RH; (b) long-term stability test of PI-SiO2/NiI2 humidity sensor at humidity range of 11%–97% RH; (c) hysteresis characteristics of PI-SiO2/NiI2 humidity sensor.
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[1] Mergu N, Kim H, Ryu J, Son Y 2020 Sens. Actuators. B 311 127906
Google Scholar
[2] Dai J X, Zhang T, Zhao H R, Fei T 2017 Sens. Actuators. B 242 1108
Google Scholar
[3] Wei Z Q, Zhou Z K, Li Q Y, Xue J C, Falco A D, Yang Z J, Zhou J H 2017 Small 13 7
[4] Hu X, Mu H, Miao J, Wang X W, Meng X S, Wang Z, Yan J L 2020 Polym. Chem. 11 4172
Google Scholar
[5] Alrammouz R, Podlecki J, Abboud P, Sorli B, Habchi R 2018 Sens. Actuators. A 284 209
Google Scholar
[6] You M H, Yan X, Zhang J, Wang X X, He X X, Yu M, Ning X, Long Y Z 2017 Nanoscale Res. Lett. 12 20
Google Scholar
[7] 盛熙淳 2020 硕士学位论文 (湘潭: 湘潭大学)
Sheng X C 2020 M. S. Thesis (Xiangtan: Xiangtan University) (in Chinese)
[8] Shinbo K, Otuki S, Kanbayashi Y, Ohdaira Y, Baba A, Kato K, Kaneko F, Miyadera N 2009 Thin Solid Films 518 629
Google Scholar
[9] Konstantaki M, Pissadakis S, Pispas S, Madamopoulos N, Vainos N A 2006 Appl. Opt. 45 4567
Google Scholar
[10] Zhang Y, Ren J X, Wu Y W, Zhong X L, Luo T, Cao J X, Yin M Q, Huang M P, Zhang Z Y 2020 Sens. Actuators, B 309 1
[11] Wang Z H, Zhang Y H, Wang W J, An Q, Tong W S 2019 Chem. Phys. Lett. 727 90
Google Scholar
[12] Hosokawa H, Mochida T 2015 Langmuir 31 13048
Google Scholar
[13] Liaw D J, Wang K L, Huang Y C, Lee K R, Lai J W, Ha C S 2012 Prog. Polym. Sci. 37 907
Google Scholar
[14] Agag T, Koga T, Takeichi T 2001 Polymer 42 3399
Google Scholar
[15] Gouzman I, Grossman E, Verker R, Atar N, Bolker A, Eliaz N 2019 Adv. Mater. 31 1807738
Google Scholar
[16] Cindro N, Tireli M, Karadeniz B, Mrla T, Užarević K 2019 ACS Sustainable Chem. Eng. 7 16301
Google Scholar
[17] Zhu K M, Tang Y, Zhong X L, Xiong L, Zhang Yong, Tan C B, Song H J, Wang J B 2020 Adv. Electron. Mater. 6 1901330
Google Scholar
[18] 李应龙, 饶元元, 王维, 谈发堂, 陈建国, 乔学亮 2014 高分子学报 4 970
Google Scholar
Li Y L, Rao Y Y, Wang W, Tan F T, Chen J G, Qiao X L 2014 Acta Polym. Sin. 4 970
Google Scholar
[19] 段翠佳, 曹义鸣, 介兴明, 王丽娜, 袁权 2014 高等学校化学学报 35 1584
Google Scholar
Duan C J, Cao Y M, Jie X M, Wang L N, Yuan Q 2014 Chem. J. Chin. Univ. 35 1584
Google Scholar
[20] Yu L, Xu H L, Monro T M, Lancaster D G, Xie Y, Zeng H B, Chen G Y, Liu X K 2017 Mater. Horiz. 4 72
Google Scholar
[21] Yu Y, Zhang X M, Ma J P, Liu Q K, Wang P, Dong Y B 2014 Chem. Commun. 50 1444
Google Scholar
[22] 吕鑫 2008 博士学位论文 (杭州: 浙江大学)
Lü X 2008 Ph. D. Dissertation (Hangzhou: Zhejiang University) (in Chinese)
[23] 王兴磊, 何宽新, 张校刚, 米红宇, 罗建民 2007 无机化学学报 4 1533
Google Scholar
Wang X L, He K X, Zhang X G, Mi H Y, Luo J M 2007 Chin. J. Inorg. Chem. 4 1533
Google Scholar
[24] 康卫民, 范兰兰, 邓南平, 何宏升, 鞠敬鸽, 程博闻 2017 纺织学报 38 168
Kang W M, Fan L L, Deng N P, He H S, Ju J G, Cheng B W 2017 J. Text. Res. 38 168
[25] Feng L, Zhang Y, Xi J M, et al. 2008 Langmuir 24 4114
Google Scholar
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