Ultra-sensitive and highly selective H₂ sensors based on FSP-made Rh-substituted SnO₂ sensing films

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• 作者：K. Inyawilert^aAuthor Vitae ; A. Wisitsoraat^bAuthor Vitae ; A. Tuantranont^bAuthor Vitae ; S. Phanichphant^cAuthor Vitae ; C. Liewhiran^a ; ^c ; ^{chaikarn_l@yahoo.com}Author Vitae
• 关键词：Flame spray pyrolysis ; SnO2 ; Rh ; H2 ; Sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：1141-1152
• 全文大小：5023 K
• 卷排序：240

文摘

Polycrystalline 0–2 wt% Rh-doped SnO2 nanoparticles were produced by flame spray pyrolysis. Structural characterizations indicated that Rh atoms were substitutional dopants with Rh3+ oxidation state. H2-sensing performances were greatly improved at a low optimal Rh-doping content of 0.2 wt%. The optimal sensor displayed an ultra-high response of 22,170 with a short response time of 6 s to 30,000 ppm of H2 at 300 °C. Rh-doped SnO2 sensors exhibited high H2 selectivity against NO2, SO2, C2H4, C3H6O, CH4, H2S and CO.