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

Xun Li; Tian Tan; Wei Ji; Wanling Zhou; Yuwen Bao; Xiaohong Xia; Zhangfan Zeng; Yun Gao

doi:10.1002/eem2.12624

Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (3) : 12624. DOI: 10.1002/eem2.12624

RESEARCH ARTICLE

Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self-Assembled Mulberry-Like ZnO/SnO₂ Hierarchical Structure

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Abstract

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.

Keywords

heterojunction / methane sensor / oxygen vacancy / piezoelectric polarization / ZnO/SnO₂ hierarchical structure

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Xun Li, Tian Tan, Wei Ji, Wanling Zhou, Yuwen Bao, Xiaohong Xia, Zhangfan Zeng, Yun Gao. Remarkably Enhanced Methane Sensing Performance at Room Temperature via Constructing a Self-Assembled Mulberry-Like ZnO/SnO₂ Hierarchical Structure. Energy & Environmental Materials, 2024, 7(3): 12624 https://doi.org/10.1002/eem2.12624

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