In2O3/g-C3N4/Au ternary heterojunction-integrated surface plasmonic and charge-separated effects for room-temperature ultrasensitive NO2 detection

被引：34

作者：

Han, Chaohan ^{[1
]}

Li, Xiaowei ^{[1
]}

Liu, Jie ^{[1
]}

Dong, Haipeng ^{[1
]}

Cheng, Wanying ^{[1
]}

Liu, Yu ^{[1
]}

Xin, Jiayu ^{[1
]}

Li, Xinghua ^{[1
]}

Shao, Changlu ^{[1
]}

Liu, Yichun ^{[1
]}

机构：

[1] Northeast Normal Univ, Key Lab UV Emitting Mat & Technol, Minist Educ, 5268 Renmin St, Changchun 130024, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2022年 / 371卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Visible-light activated; In2O3; g-C3N4; Au; LSPR; Room-temperature; NO2; PHOTOCATALYTIC ACTIVITY; IN2O3; NANOPARTICLES; FABRICATION; NANOFIBERS; SENSORS; UV; HETEROSTRUCTURES; MICROSPHERES;

D O I：

10.1016/j.snb.2022.132448

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Light-activated gas sensors based on semiconducting metal oxides (SMOs) hold great promise for next-generation gas sensing application, due to their unique superiority including room-temperature operation, intrinsic safety, and simple device structure. However, poor visible-light absorption and fast carrier recombination of SMOs sensing film are two main barriers that seriously restrict their sensing performance of light-activated gas sensors. Herein, a visible-light activated gas sensor based on Au nanoparticles modified In2O3/g-C3N4 heterojunction nanofibers is developed. Excellent sensing response (Rg/Ra = 17.2 to 1 ppm NO2, where Ra and Rg represent the resistance of sensors when exposed to air or target gas) and fast response/recovery kinetics at room temperature are obtained, which is markedly better than the sensors based on pristine In2O3 nanofibers and In2O3/g-C3N4 nanofibers. Through the discussion and estimation of experimental results, the improved gas sensing properties of In2O3/g-C3N4/Au-based sensors are speculated to be related to the enhanced visible light utilization benefiting from localized surface plasmon resonance (LSPR) effect of Au nanoparticles, and the efficient separation of photo-generated carriers enabled by heterojunctions between In2O3, Au, and g-C3N4 components. The current work will provide a universal strategy to develop high-performance light-activated gas sensor and a deep understanding about the sensing principle of this novel type of gas sensor.

引用

页数：9

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