Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self‐Assembled Mulberry‐Like ZnO / SnO 2 Hierarchical Structure

作者：Xun Li, Tian Tan, Wei Ji, Wanling Zhou, Yuwen Bao, Xiaohong Xia, Zhangfan Zeng, Yun Gao · 发表于：Energy & environment materials · 年份：2023 · DOI：10.1002/eem2.12624 · 被引用次数：30 · 研究领域：Gas Sensing Nanomaterials and Sensors、Analytical Chemistry and Sensors、Advanced Chemical Sensor Technologies

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/SnO 2 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 CH 4 at 55% relative humidity. It is found that the strain induced at the ZnO/SnO 2 interface greatly enhances the piezoelectric polarization on the ZnO surface and that the band bending results in the accumulation of chemically adsorbed ions close to the interface, leading to significant improvement in the sensing performance of the methane gas sensor at room temperature.