Increasing sensitivity of ZnO nanoparticles by hydrogenation and sensing reaction mechanism
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Sensing reaction mechanism is decisive for improvement of the sensing property of metal oxide sensing materials. Herein, we demonstrated a conceptually different approach to improving sensing property of ZnO nanoparticles by increasing quantity of the surface unsaturated 3-coordinated Zn atoms through hydrogenation. The surface 3-coordinated Zn atoms play a pivotal role in sensing reaction. They can produce electrons, adsorb O2 and catalyze the gas sensing reaction between the adsorbed oxygen and test gas. A sensing mechanism of the unsaturated Zn atom serving as a sensing reactive site is presented for the first time. The mechanism provides a deep understanding for sensing and catalytic reaction mechanisms. In addition, the sensing performance of other sensing materials and reactive activity of catalysts may be enhanced by increasing concentration of surface unsaturated metal atom through hydrogenation.
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51872178, 51702204 and 201501116), the National Key Research Program of China (Grant No. 2016YFA0202403), DNL Cooperation Fund CAS (Grant No. DNL180311), China Postdoctoral Science Foundation (Grant No. 2017M613051), and the 111 Project (Grant No. B14041).
- 7.X.T. Yin, W.D. Zhou, J. Li, P. Lv, Q. Wang, D. Wang, F.Y. Wu, D. Dastan, H. Garmestani, Z.C. Shi, Ş. Ţălu, Tin dioxide nanoparticles with high sensitivity and selectivity for gas sensors at sub-ppm level of hydrogen gas detection. J. Mater. Sci.: Mater. Electron. 30, 14687–14694 (2019)Google Scholar
- 25.Q. Zhao, Q. Shen, F. Yang, H. Zhao, B. Liu, Q. Liang, A.H. Wei, H.Q. Yang, S.Z. Liu, Direct growth of ZnO nanodisk networks with an exposed (0001) facet on Au comb-shaped interdigitating electrodes and the enhanced gas-sensing property of polar 0001 surfaces. Sens. Actuators B 195, 71–79 (2014)CrossRefGoogle Scholar
- 36.D. Dastan, N. Chaure, M. Kartha, Surfactants assisted solvothermal derived titania nanoparticles: synthesis and simulation. J. Mater. Sci.: Mater. Electron. 28, 7784–7796 (2017)Google Scholar
- 37.D. Dastan, S.L. Panahi, N.B. Chaure, Characterization of titania thin films grown by dip-coating technique. J. Mater. Sci.: Mater. Electron. 27, 12291–12296 (2016)Google Scholar