Morphology and Gas-Sensing Properties of Tin Oxide Foams with Dual Pore Structure
作者： Kyungju Nam , Hyeong-Gwan Kim , Hyelim Choi , Hyeji Park , Jin Soo Kang
DOI: 10.1007/S11664-016-5242-6
关键词: Metallurgy 、 Morphology (linguistics) 、 Chemical engineering 、 Solid-state physics 、 Indium tin oxide 、 Semiconductor 、 Sintering 、 Tin oxide 、 Materials science 、 Scanning electron microscope 、 Catalysis
摘要: Tin oxide is a commonly used gas-sensing material, which can be applied as an n- or p-type gas sensor. To improve the performance of tin oxide, we successfully synthesized foam via ice-templating freeze-casting method. The samples showed different morphological features depending on major processing parameters, include sintering temperature, time, and amount added powder. Based scanning electron microscopy images, could identify dual pore structure containing ‘wall’ pores ranging from 5.3 μm to 10.7 μm, well smaller secondary (a few micrometers in size) wall surfaces. Gas-sensing tests for foams reveal sensitivity 13.1, response time 192 s, recovery 160 s at ethanol concentration 60 ppm 300°C. This remarkable result given that it semiconductor behavior was without addition any catalyst.
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