4.8 Article

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

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 44, Pages 24950-24956

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b08630

Keywords

high energy facet; SnO2 nanoplates; room temperature sensor; ethanol; TiO2 nanobelts; heterostructure

Funding

  1. National Natural Science Foundation of China [51402172, 51372142, 50802055]
  2. Innovation Research Group [IRG: 51321091]
  3. Fundamental Research Funds of Shandong University [2015JC017, 2014QY003]

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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 degrees 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 degrees 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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