Highly selective environmental sensors based on flame-spray-made SnO₂ nanoparticles

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• 作者：C. Liewhiran^a ; ^b ; ^d ; ^{chaikarn_l@yahoo.com}  ; [Author Vitae] ; N. Tamaekong^b  ; [Author Vitae] ; A. Wisitsoraat^c  ; [Author Vitae] ; S. Phanichphant^b ; ^d  ; [Author Vitae]
• 关键词：SnO2 ; Flame spray pyrolysis ; Selectivity ; Toxic gas ; Flammable gas
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：1 March, 2012
• 卷：163
• 期：1
• 页码：51-60
• 文件大小：1617 K

摘要

Flame-spray-made SnO₂ thick films fabricated by spin coating method were studied for toxic and flammable gas-sensing applications. From physical characterization by X-ray diffraction, Brunauer-Emmett-Teller analysis, scanning and transmission electron microscopy, SnO₂ nanoparticles were found to have non-agglomerated spherical, hexagonal, rectangle (3-10 nm), and rod-like (3-5 nm in width and 5-20 nm in length) morphologies with large specific surface area of 141.6 m²/g. The sensing films were prepared by spin coating on Al₂O₃ substrate with interdigitated Au electrode. The sensing films were tested toward some important toxic (NO₂, CO, SO₂) and flammable (H₂, C₂H₂) gases. It was found that SnO₂ sensing film showed excellent response and selectivity for NO₂ at a low operating temperature of 200 掳C. In addition, the response linearly increased and the response time drastically decreased with increasing gas concentration. Therefore, the spin-coated flame-spray-prepared SnO₂ sensor is one of the most promising candidates for highly sensitive and selective detection of noxious NO₂ gas.