Construction of rGO-SnO2 heterojunction for enhanced hydrogen detection

被引：40

作者：

Li, Guodong ^{[1
]}

Shen, Yanbai ^{[1
]}

Zhao, Sikai ^{[1
]}

Bai, Jinzhou ^{[1
]}

Gao, Shuling ^{[1
]}

Liu, Wenbao ^{[1
]}

Wei, Dezhou ^{[1
]}

Meng, Dan ^{[2
]}

San, Xiaoguang ^{[2
]}

机构：

[1] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China

[2] Shenyang Univ Chem Technol, Coll Chem Engn, Shenyang 110142, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2022年 / 585卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

rGO; SnO2; Nanocomposites; H-2; Gas sensing; SENSING PROPERTIES; SNO2; NANOWIRES; NANOPARTICLES; NANOCOMPOSITES;

D O I：

10.1016/j.apsusc.2022.152623

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sandwich-structured rGO-SnO2 nanocomposites comprising of reduced graphene oxide (rGO) nanosheets and SnO2 nanoparticles were prepared by a simple refluxing reaction, and its hydrogen sensing performance was investigated. The structural characterization confirmed that the ultra-fine cylindrical SnO2 nanoparticles with length of -15 nm and diameter of -5 nm were loaded on the surface of rGO nanosheets. BET surface area of rGO-SnO2 nanocomposite enhanced as the amount of GO increased. Additionally, the increase in the amount of GO effectively inhibited the disproportionation reaction of Sn2+ during the annealing process. When the mass ratio of GO to SnO2 was higher than 1.0 wt%, the disproportionation reaction of Sn2+ was completely suppressed and all Sn-related products were changed into SnO2 phases. The 1.0 wt% rGO-SnO2 nanocomposites based gas sensor showed the highest response of 11.88 to 500 ppm H-2 at 225 ?, with fast response/recovery times of 2 s/ 19 s and a detection limit of lower than 5 ppm. Especially, the sensor showed good reproducibility, selectivity, moisture resistance, and long-term stability. H-2 sensing mechanisms of rGO-SnO2 nanocomposites were discussed based on the experimental data and gas-sensing reaction theory.

引用

页数：10

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