Synthesis and gas sensing properties of palladium-doped indium oxide microstructures for enhanced hydrogen detection
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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).
- 10.X. Yin, C. Xu, S. Li, J. Lu, Q. Wang, Sensing properties of Au-loaded SnO2 sensor for H2 and CO detection. J. Mater. Sci. Mater. Electron. doi: 10.1007/s10854-015-3718-4
- 17.Y. Gui, J. Zhao, H. Wang, J. Tian, H. Zhang, Microwave-assisted gas–liquid interfacial synthesis of WO3 precursor and nano-WO3 for gas-sensing application. J. Mater. Sci. Mater. Electron. doi 10.1007/s10854-016-4584-4
- 20.L. Xu, H. Song, B. Dong, Y. Wang, J. Chen, X. Bai, Preparation and bifunctional gas sensing properties of porous In2O3–CeO2 binary oxide nanotubes. lnorg. Chem. 49, 10590–10597 (2010)Google Scholar
- 23.L. Liu, S. Li, X. Guo, L. Wang, L. Liu, X. Wang, The fabrication of In2O3 nanowire and nanotube by single nozzle electrospinning and their gas sensing property. J. Mater. Sci.: Mater. Electron. 27, 5153–5157 (2016)Google Scholar
- 24.L. Xu, B. Dong, Y. Wang, X. Bai, J. Chen, Q. Liu, H. Song, Porous In2O3: RE (RE) Gd, Tb, Dy, Ho, Er, Tm, Yb) nanotubes: electrospinning preparation and room gas-sensing properties. J. Phys. Chem. C 114, 9089–9095 (2010)Google Scholar