Gas-sensing performance of In2O3@MoO3 hollow core-shell nanospheres prepared by a two-step hydrothermal method

被引：38
作者：
Fu, Haitao [1 ,2 ]
Yang, Xiaohong [1 ,2 ]
Wu, Zhenxiang [2 ]
He, Peng [2 ]
Xiong, Shixian [3 ]
Han, Dezhi [4 ]
An, Xizhong [2 ]
机构：
[1] Northeastern Univ, Key Lab Ecol Met Multimetall Mineral, Minist Educ, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
[3] Jiangxi Univ Sci & Technol, Jiangxi Prov Key Lab Simulat & Modelling Particul, Nanchang 330013, Jiangxi, Peoples R China
[4] Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2022年 / 352卷
基金：
中国国家自然科学基金;
关键词：
In2O3 hollow nanospheres; In2O3@MoO3 core-shell hollow structures; Gas sensors; n-butylamine; Catalytic sensing mechanism; HIGHLY SENSITIVE ETHANOL; V2O5; MICROFLOWERS; ALPHA-MOO3; IN2O3; NANOSTRUCTURES; NANOTUBES; NANOBELTS; SENSORS; FILMS;
D O I：
10.1016/j.snb.2021.131007
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Core-shell semiconductor nanostructures can be suitable for high-performance gas sensors due to their unique structural features. In this study, In2O3@MoO3 core-shell hollow spheres were synthesized by a facile two-step solvo-thermal method, followed by post-heat treatment. The synthesis results in 20-nm thick MoO3 shells coated on In2O3 hollow spheres (200-nm diameter). The effects of the morphology and composition on gas sensing performance were systematically investigated by adjusting the molar ratio of In to Mo. The sensing tests suggest that the core-shell structure with the In to Mo molar ratio of 1:1 exhibits the highest sensing response (28.1) towards 100-ppm n-butylamine at the optimized working temperature of 300 degrees C. This response is two times higher than that of the In2O3 & MoO3 binary mixture (11.1) and five times than that of the pristine In2O3 hollow spheres (4.8). The sensing performance is a result of the unique core-shell structures including both the catalytic reaction mechanism of MoO3 and the co-catalytic properties of the In2O3 hollow spheres. This study may shed light on the design of practical, high-performance amine gas sensors in the future.
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页数：13
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