Synthesis and characterization of porous WO3–SnO2 nanomaterials: An infrared study of adsorbed pyridine and dimethyl methylphosphonate |
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| Institution: | 1. Department of Electrical and Computer Engineering, University of Tehran, Tehran, Iran;2. Department of chemistry, Iran University of Science and Technology, Tehran, Iran;3. Delft Institute of Microsystems and Nanoelectronics (DIMES), Delft University of Technology, Delft, The Netherlands;1. Faculty of Chemistry, University of Opole, Oleska 48, 45-052 Opole, Poland;2. Institute of Chemistry, Siedlce University of Natural Sciences and Humanities, 3 Maja 54, 08-110 Siedlce, Poland;3. Department of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland;1. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia;2. Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;3. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2500, Australia;4. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;5. Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan;6. Guangdong Technion-Israel Institute of Technology, Shantou 515063, PR China |
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| Abstract: | High surface area porous W/Sn oxide nanomaterials were prepared via water/oil based (W/O) emulsion. Tungstic acid solution was generated by cation exchange of sodium tungstate in acidic Dowex resin. The acid was then mixed with a clear homogeneous aqueous N-cetyl trimethyl ammonium bromide (CTAB) solution followed by a slow addition of 0.2 M SnCl4 solution. The mixture was stirred for 24 h and then subjected to slow calcination at 500 °C. The prepared materials were characterized using SEM-EDX, BET surface area, and sorption of nitrogen and water. Fourier transform infrared spectroscopy (FTIR) was used to characterize the surface acidic properties using pyridine vapor as a probe. The materials were then tested toward the Dimethyl methylphosphonate (DMMP) adsorption at various temperatures using infrared spectroscopy. At elevated temperatures, the desorption of DMMP from WO3 and SnO2 surfaces results in forming methyl phosphonate that strongly bounds on the metal oxide surfaces. In contrast, the FTIR spectra showed that the adsorbed dimethyl methylphosphonate (DMMP) on the mixed W/Sn oxide powders can be molecularly desorbed without any decomposition. |
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| Keywords: | Tungsten oxide Tin oxide Mixed oxides Sensors DMMP FTIR Adsorption |
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