TiO2/KNbO3 nanocomposite for enhanced humidity sensing performance

被引：7

作者：

Wang, Jingsong ^{[1
]}

Zhao, Bing ^{[2
]}

Wang, Chunchang ^{[1
]}

机构：

[1] Anhui Univ, Sch Phys & Mat Sci, Lab Dielectr Funct Mat, Hefei 230601, Peoples R China

[2] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 2023年 / 349卷

基金：

中国国家自然科学基金;

关键词：

Humidity sensor; Impedance; Hydrothermal method; Nanocomposite; TiO2; KNbO3; HIGH-SENSITIVITY; SENSOR; TIO2; POLYELECTROLYTE; NANOSHEETS; TEMPERATURE; FABRICATION; FILM;

D O I：

10.1016/j.sna.2022.114057

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

TiO2/KNbO3 nanocomposite was prepared by a two-step hydrothermal method. Impedance-type sensors based on TiO2/KNbO3, TiO2, and KNbO3, were fabricated by aerosol deposition method. The humidity sensing prop-erties were investigated in a relative humidity range of 11-95%. Our results reveal that the TiO2/KNbO3-based sensor shows a large impedance change over 5 orders of magnitude, which is 1-2 orders of magnitude larger than that of TiO2- and KNbO3-based sensors. A fast response time of 3 s and a relatively long recovery time of 163 s were obtained for the TiO2/KNbO3-based sensor. The boosted humidity sensing performance of the TiO2/KNbO3 nanocomposite is believed to be due to the combined effect of the heterojunction at the TiO2/KNbO3 interface and the Grotthuss mechanism. This work underscores that the two-step hydrothermal method would be a powerful method for fabricating high-purity nanocomposites with excellent humidity sensing performance.

引用

页数：8

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