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

详细信息    查看全文

• 作者：Guohui Chen ; Shaozheng Ji ; Haidong Li ; Xueliang Kang ; Sujie Chang ; Yana Wang ; Guangwei Yu ; Jianren Lu ; Jerome Claverie ; Yuanhua Sang ; Hong Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：7
• 期：44
• 页码：24950-24956
• 全文大小：513K
• ISSN：1944-8252

文摘

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 掳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 掳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.