☆ 4.7 Article

Nanoplates of α-SnWO4 and SnW3O9 prepared via a facile hydrothermal method and their gas-sensing property

SENSORS AND ACTUATORS B-CHEMICAL (2009)

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SENSORS AND ACTUATORS B-CHEMICAL
卷 140, 期 2, 页码 623-628

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.05.010

关键词

SnWO4; SnW3O9; Nanoplate; Hydrothermal; Gas-sensing

类别

Chemistry, Analytical Electrochemistry Instruments & Instrumentation

资金

  1. National Natural Science Foundation of China [20537010, 20677009]
  2. National Basic Research Program of China [2007CB613306, 2007CB616907]
  3. Fujian Province [E0710009]
  4. Program for Changjiang Scholars and Innovative Research Team in University [PCSIRT0818]
  5. New Century Excellent Talents in University [NCET-05-0572]
  6. State Education Ministry of P.R. China

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Nanoplates of alpha-SnWO4 and SnW3O9 were selectively synthesized in large scale via a facile hydrothermal reaction method. The final products obtained were dependent on the reaction pH and the molar ratio of W6+ to Sn2+ in the precursors. The as-prepared nanoplates of alpha-SnWO4 and SnW3O9 were characterized by X-ray powder diffraction (XRD), N-2-sorption BET surface area, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and X-ray photorelectron spectroscopy (XPS). The XPS results showed that Sn exists in divalent form (Sn2+) in SnW3O9 as well as in alpha-SnWO4 . The gas-sensing performances of the as-prepared alpha-SnWO4 and SnW3O9 toward H2S and H-2 were investigated. The hydrothermal prepared alpha-SnWO4 showed higher response toward H-2 than that prepared via a solid-state reaction due to the high specific surface area. The gas-sensing property toward H2S as well as H-2 over SnW3O9 was for the first time reported. As compared to alpha-SnWO4, SnW3O9 exhibits higher response toward H2S and its higher response can be well explained by the existence of the multivalent W(W6+/W4+) in SnW3O9. (C) 2009 Elsevier B.V. All rights reserved.

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