Increasing sensitivity of ZnO nanoparticles by hydrogenation and sensing reaction mechanism

Increasing sensitivity of ZnO nanoparticles by hydrogenation and sensing reaction mechanism
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通过氢化和传感反应机制提高 ZnO 纳米粒子的灵敏度

DOI:
10.1007/s10854-019-02117-y
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发表时间:
2019-10
期刊:
Journal of Materials Science: Materials in Electronics
影响因子:
--
通讯作者:
Heqing Yang
Heqing Yang
中科院分区:
其他
文献类型:
--
作者:
Cuijin Pei;Bin Liu;Junfang Liu;Yukun Yuan;Miao Wang;Ye Wang;Hua Zhao;Heqing Yang

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敏感反应机理是提高金属氧化物敏感材料敏感性能的决定性因素。在此,我们展示了一种概念上不同的方法来提高ZnO纳米颗粒的传感性能,通过氢化增加表面不饱和的3-配位Zn原子的数量。表面3配位的Zn原子在传感反应中起着关键作用。它们能产生电子、吸附O2并催化被吸附的氧与被测气体之间的气敏反应。首次提出了不饱和Zn原子作为传感反应位点的传感机理。该机制为传感和催化反应机制提供了深入的理解。此外,通过加氢提高表面不饱和金属原子的浓度,可以提高其它敏感材料的敏感性能和催化剂的反应活性。
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 O2and 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.
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