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      High-Energy Faceted SnO₂-Coated TiO₂ Nanobelt Heterostructure for Near-Ambient Temperature-Responsive Ethanol Sensor.

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          Abstract

          A SnO2 gas sensor was prepared by a two-step oxidation process whereby a Sn(II) precursor was partially oxidized by a hydrothermal process and the resulting Sn3O4 nanoplates were thermally oxidized to yield SnO2 nanoplates. The SnO2 sensor was selective and responsive toward ethanol at a temperature as low as 43 °C. This low sensing temperature stems from the rapid charge transport within SnO2 and from the presence of high-energy (001) facets available for oxygen chemisorption. SnO2/TiO2 nanobelt heterostructures were fabricated by a similar two-step process in which TiO2 nanobelts acted as support for the epitaxial growth of intermediate Sn3O4. At temperatures ranging from 43 to 276 °C, the response of these branched nanobelts is more than double the response of SnO2 for ethanol detection. Our observations demonstrate the potential of low-cost SnO2-based sensors with controlled morphology and reactive facets for detecting gases around room temperature.

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          Author and article information

          Journal
          ACS Appl Mater Interfaces
          ACS applied materials & interfaces
          American Chemical Society (ACS)
          1944-8252
          1944-8244
          Nov 11 2015
          : 7
          : 44
          Affiliations
          [1 ] State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
          [2 ] School of Information Science and Engineering, Shandong University , Jinan, Shandong 250100, China.
          [3 ] NanoQAM Research Center, Department of Chemistry, University of Quebec at Montreal , 2101 rue Jeanne-Mance, CP 8888, Montreal, Quebec H3C3P8, Canada.
          [4 ] Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Science , Beijing 100864, China.
          Article
          10.1021/acsami.5b08630
          26484799

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