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

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.

Journal

Journal ID (iso-abbrev): ACS Appl Mater Interfaces

Title: ACS applied materials & interfaces

Publisher: American Chemical Society (ACS)

ISSN (Electronic): 1944-8252

ISSN (Print): 1944-8244

Publication date (Electronic): Nov 11 2015

Volume: 7

Issue: 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

DOI: 10.1021/acsami.5b08630

PubMed ID: 26484799