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有机-无机杂化型比色湿度传感器可通过电学信号和颜色变化获取环境湿度, 并因其特征颜色区分度高、稳定性好、制备工艺简单等优点, 在湿度监测领域具有广阔的应用前景, 但其通常响应恢复时间长, 从而不利于湿度实时监测. 本文在聚酰亚胺(PI)-碘化镍(NiI2)有机无机杂化材料中掺杂纳米SiO2微球制备得到PI-SiO2/NiI2复合薄膜及比色湿度传感器, 对其表面形貌和湿敏特性进行了研究. 结果显示, PI-SiO2/NiI2薄膜具有蜂巢状的表面形貌, 传感器的特征颜色显著, 湿度响应时间小于1.5 s, 恢复时间小于18 s. 研究表明, 纳米SiO2微球掺杂能够较为显著地改善有机-无机杂化型比色湿度传感器的响应恢复特性, 这对于传感器性能的提升具有一定参考意义.
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关键词:
- 比色湿度传感器 /
- 有机-无机杂化 /
- PI-SiO2/NiI2 /
- 响应恢复特性
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.-
Keywords:
- colorimetric humidity sensor /
- organic-inorganic hybrid /
- PI-SiO2/NiI2 /
- response-recovery properties
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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
Fig. 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
Fig. 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
Fig. 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
Fig. 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
Fig. 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
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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
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Google Scholar
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Google Scholar
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[16] Cindro N, Tireli M, Karadeniz B, Mrla T, Užarević K 2019 ACS Sustainable Chem. Eng. 7 16301
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Google Scholar
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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
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Google Scholar
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Google Scholar
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Lü X 2008 Ph. D. Dissertation (Hangzhou: Zhejiang University) (in Chinese)
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Google Scholar
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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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