Abstract
ZnO semiconductor hybrids with high response and selectivity to various gases have received enormous attention for practical applications. In this work, Au/ZnO nanoparticles were synthesized via a facile solution combustion method, using chlorauric acid and zinc nitrate as the raw materials. X-ray diffraction and field-emission scanning microscopy revealed that the Au/ZnO nanoparticles, with diameters of 50–300 nm, were mainly composed of the ZnO wurtzite phase and Au metal phase with a face-centered structure. The gas-sensing results indicated that the Au (4 at. %)/ZnO-based sensor exhibited the highest response and selectivity among all the as-obtained Au/ZnO products; moreover, its response to acetone was approximately 3 times greater than that of the pure ZnO, and the response (173) of the sensor to acetone was 2.4, 9.8, 17, and 22 times higher than that to C2H5OH, H2, CO, and CH4 at 300°C, respectively.
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