The thermal desorption of surface hydroxyls on tin(IV) oxide.

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概要

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• The structure of the adsorbed layer of water on SnO<SUB>2</SUB> was investigated by means of thermal desorption, water physisorption, and electron diffraction, using four kinds of SnO<SUB>2</SUB> samples which differ in method of preparation. Two distinct peaks appear around 513 and 573 K in the thermal-desorption spectra. The peak around 513 K is due to the condensation dehydration of hydroxyls on the (100) plane of SnO<SUB>2</SUB>, on which the two-dimensional condensation of water occurs. The peak around 573 K is associated with that on the (101) plane, on which the physisorption of water is strong and the two-dimensional condensation of water does not occur. The portion of the (100) plane occupied by water molecules is relatively small, and the 1 : 4 ratio (H<SUB>2</SUB>O : OH) holds also on the surfaces on which the two-dimensional condensation of water does not occur. In conclusion, the fully hydroxylated surfaces of SnO<SUB>2</SUB> are hydrophobic in the sense that they sparsely adsorb water molecules.

• 公益社団法人 日本化学会の論文

著者

• Morimoto Tetsuo

  Department Of Biomechanical Systems Ehime University

• Kittaka Shigeharu

  Department Of Chemistry Faculty Of Science Okayama University Of Science

• Morishige Kunimistu

  Department of Chemistry, Faculty of Science, Okayama College of Science

• MORIMOTO Tetsuo

  Department of Bio-mechanical Systems, Faculty of Agriculture, Ehime University

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