Abstract
The α-Fe2O3/ZnO core-shell nanowires (NWs) on micro-electro-mechanical system structure were prepared for hydrogen sulfide (H2S) gas sensing. Core α-Fe2O3 NWs were prepared by thermal oxidation and the ZnO shell layer was coated by atomic layer deposition, respectively. The diameter of the obtained α-Fe2O3/ZnO core-shell NWs increases uniformly with the increase of ZnO shell thickness. When the operating temperature is 250 °C, the maximum response of the α-Fe2O3/ZnO core-shell NWs gas sensor to 5 ppm H2S is 5.98, which is about five times of pure α-Fe2O3 NWs gas sensor (∼1.1). Moreover, α-Fe2O3/ZnO core-shell NWs-based gas sensors showed good selectivity, response, and recovery properties to H2S. The improvement of gas response of core-shell NWs is due to the slender α-Fe2O3/ZnO core-shell NWs and the appropriate energy band structure between ZnO and α-Fe2O3. Thus, the proposed α-Fe2O3/ZnO core-shell NWs will be one of ideal sensitive materials for H2S high-performance sensor.
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