Meso- to Macro-Porous Oxides as Semiconductor Gas Sensors |
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| Authors: | Yasuhiro Shimizu Takeo Hyodo Makoto Egashira |
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| Affiliation: | (1) Department of Chemical Engineering, Institute of Nirma University, Ahmedabad, Gujarat, 382481, India;(2) Department of Chemistry, Krantiguru Shyamji Krishna Verma Kachchh University, Mundra Road, Bhuj, Gujarat, 370 001, India; |
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| Abstract: | The present article reviews our latest studies directed to improving gas sensing properties of semiconductor metal oxides, SnO2 and TiO2, by controlling their porous structure in the range of nano- to micro-meter size. Thermally stable mesoporous oxide powders and submicron-size porous thick films were fabricated by a templating method employing supramolecular surfactants or polymethylmethacrylate microspheres and also by a sol–gel process in a polyethylene glycol matrix. Advantages of these methods in improving the sensing properties are overviewed and then remaining problems are discussed. |
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| Keywords: | nano-crystallite ordered mesopore tin dioxide titanium dioxide semiconductor gas sensors |
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