High-Energy Faceted SnO₂-Coated TiO₂ Nanobelt Heterostructure for Near-Ambient Temperature-Responsive Ethanol Sensor.
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.
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Guohui
G
Chen
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Shaozheng
S
Ji
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Haidong
H
Li
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Xueliang
X
Kang
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Sujie
S
Chang
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Yana
Y
Wang
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Guangwei
G
Yu
School of Information Science and Engineering, Shandong University , Jinan, Shandong 250100, China.
Jianren
J
Lu
NanoQAM Research Center, Department of Chemistry, University of Quebec at Montreal , 2101 rue Jeanne-Mance, CP 8888, Montreal, Quebec H3C3P8, Canada.
Jerome
J
Claverie
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.
Yuanhua
Y
Sang
State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250100, China.|Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Science , Beijing 100864, China.
Hong
H
Liu
SnO2 nanoplates; TiO2 nanobelts; ethanol; heterostructure; high energy facet; room temperature sensor