期刊
RSC ADVANCES
卷 4, 期 31, 页码 16067-16074出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra01364f
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资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2013R1A2A1A01006545]
- NRF - MEST [2012R1A2A2A02046367]
SnO2 yolk-shell spheres uniformly loaded with Ag nanoparticles were prepared by a facile one-pot ultrasonic spray pyrolysis of the source solution and the H2S sensing characteristics were investigated. The Ag-loaded SnO2 yolk-shell spheres showed ultrahigh and reversible response (Ra/Rg -1 = 613.9, where R-a is the resistance in air and Rg is the resistance in gas) to 5 ppm H2S with negligible cross-responses (0.6-17.3) to eight other interference gases at 350 degrees C. In contrast, pure SnO2 spheres with dense inner structures and yolk-shell morphologies did not exhibit a high response/selectivity to H2S nor reversible H2S sensing. The highly sensitive, selective, and reversible H2S sensing characteristics were explained in terms of the gas-accessible yolk-shell morphology and uniform loading of catalytic Ag nanoparticles. Namely, the gas-accessible yolk-shell morphology facilitated the rapid and effective diffusion of the analyte/oxygen gases and the uniform loading of Ag nanoparticles promoted the H2S sensing reaction.
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