Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self-Assembled Mulberry-Like ZnO/SnO2 Hierarchical Structure
Xun Li , Tian Tan , Wei Ji , Wanling Zhou , Yuwen Bao , Xiaohong Xia , Zhangfan Zeng , Yun Gao
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (3) : 12624
Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self-Assembled Mulberry-Like ZnO/SnO2 Hierarchical Structure
Development of metal oxide semiconductors-based methane sensors with good response and low power consumption is one of the major challenges to realize the real-time monitoring of methane leakage. In this work, a self-assembled mulberry-like ZnO/SnO2 hierarchical structure is constructed by a two-step hydrothermal method. The resultant sensor works at room temperature with excellent response of ~56.1% to 2000 ppm CH4 at 55% relative humidity. It is found that the strain induced at the ZnO/SnO2 interface greatly enhances the piezoelectric polarization on the ZnO surface and that the band bending results in the accumulation of chemically adsorbed O2- ions close to the interface, leading to significant improvement in the sensing performance of the methane gas sensor at room temperature.
heterojunction / methane sensor / oxygen vacancy / piezoelectric polarization / ZnO/SnO 2 hierarchical structure
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2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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