Journal
ENERGY & ENVIRONMENTAL MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1002/eem2.12624
Keywords
heterojunction; methane sensor; oxygen vacancy; piezoelectric polarization; ZnO/SnO2 hierarchical structure
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A self-assembled mulberry-like ZnO/SnO2 hierarchical structure is constructed using a two-step hydrothermal method for the development of metal oxide semiconductors-based methane sensors. The resulting sensor exhibits excellent response of approximately 56.1% to 2000 ppm CH4 at room temperature and low power consumption. It is found that the strain induced at the ZnO/SnO2 interface greatly enhances the piezoelectric polarization on the ZnO surface, leading to significant improvement in the sensing performance of the methane gas sensor at room temperature.
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 selfassembled 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 similar to 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 O similar to 2 ions close to the interface, leading to significant improvement in the sensing performance of the methane gas sensor at room temperature.
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