Optimal construction and gas sensing properties of SnO2@TiO2 heterostructured nanorods

被引：29
作者：
Li, Ang [1 ]
Zhao, Sikai [1 ]
Bai, Jinzhou [1 ]
Gao, Shuling [1 ]
Wei, Dezhou [1 ]
Shen, Yanbai [1 ]
Yuan, Zhenyu [2 ]
Meng, Fanli [2 ]
机构：
[1] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Sch Informat Sci & Engn, Shenyang 110819, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2022年 / 355卷
基金：
中国国家自然科学基金;
关键词：
TiO2; nanorods; SnO2; nanoparticles; Heterojunction; H-2; Gas sensor; TIO2; SENSOR; H-2; CORE; PD; NANOCOMPOSITES; SENSITIZATION; NANOFIBERS; NANOWIRES; ELEMENTS;
D O I：
10.1016/j.snb.2021.131261
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Network-structured TiO2 nanorods were synthesized via a facile hydrothermal method and decorated with SnO2 nanoparticles by a solution-coating method to form SnO2@TiO2 nanorods (STNRs). The structural characterization indicated that SnO2 loading amount has a great effect on the microstructure and morphology of TiO2 backbone. The diameter of TiO2 nanorods increased from about 160 nm to 190 nm after decoration by SnO2 nanoparticles with approximately 7 nm in diameter. The static gas sensing tests revealed that the highest response of 15.4 was achieved for the 1.0 STNRs sample to 500 ppm H-2 at 100 degrees C, and the response time and recovery time were 11 s and 132 s, respectively. Gas sensors based on SnO2@TiO2 heterostructured nanorods also showed excellent reproducibility and selectivity to H-2. The enhanced sensing mechanism of STNRs to H-2 is discussed in relation to the modulation of conduction channel, potential barrier, and chemical/electron sensitization.
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页数：10
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