Synthesis and gas sensing properties of palladium-doped indium oxide microstructures for enhanced hydrogen detection
In this paper, the pure In2O3 and Pd-doped In2O3 (0.5, 1.0, 2.0 and 4.0 mol%) flower-like spherical microstructures have been synthesized by a hydrothermal method. The crystal structure and surface morphology of as-prepared samples were characterized by X-ray diffraction and scanning electron microscopy. The gas sensing experiments were carried out on all the as-prepared gas sensors to hydrogen gas, and the measured results demonstrated that the Pd-doped In2O3 gas sensors exhibit enhanced gas sensing performance under the optimal working temperature of 210 °C. Especially, the 1.0 mol% Pd-doped In2O3 sensor shows the highest response to 100 ppm hydrogen gas at 210 °C, which was almost two times higher than that of pure one. Furthermore, the 1.0 mol% Pd-doped In2O3 gas sensor also shows fast response/recovery time about 4 and 7 s, respectively. Finally, the gas sensing mechanism was also discussed on the pure and Pd-doped In2O3 gas sensors.
KeywordsIn2O3 Ethyl Cellulose Indium Oxide Optimum Operating Temperature Facile Hydrothermal Method
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51205274), Shanxi Scholarship Council of China (Grant No. 2013-035), Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (95), Shanxi Province Science Foundation for Youths (Grant No. 2013021017-2).
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