A method for effectively regulating the green emissions of ZnO through NiS@NiO/rGO
A method for effectively regulating the green emissions of ZnO through NiS@NiO/rGO
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一种通过NiS@NiO/rGO有效调控ZnO绿色排放的方法
DOI：
10.1016/j.apsusc.2021.149805
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发表时间：
2021-08
影响因子：
6.7
通讯作者：
Jin Li
中科院分区：
文献类型：
--
作者：
Xiangjia Liu;Jin Li
本研究采用x射线衍射（XRD）、高分辨率透射电镜（HRTEM）和扫描电镜（SEM）对ZnO/NiS@NiO/rGO （ZNNG）复合材料进行了表征。与简单ZnO相比，ZNNG表现出更强的绿色发射，但没有观察到紫外（UV）发射峰。通过对ZnO及其复合材料的紫外-可见吸收光谱、Mott Schottky （MS）图、电子顺磁共振（EPR）谱和x射线光电子能谱（XPS）结果的综合分析，证明ZnO及其复合材料的稳定绿色发射源于Zn间隙（Zni）和表面氧缺陷之间的电子猝灭。NiS@NiO的引入使ZnO的导带（CB）和价带（VB）转变为较低的能态，有效地增加了ZnO在可见光下的吸收强度，同时在ZnO表面引入了许多与氧相关的缺陷。进一步添加还原氧化石墨烯有效地促进了电子从CB向费米能（Ef）的迁移。这些效应有效地增加了ZnO的绿色发光，降低了紫外发光。最后，提出了近似于零带隙NiS@NiO/rGO能显著增强ZnO绿色发光的合适机制。
In this study, a ZnO/NiS@NiO/rGO (ZNNG) composite was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Compared with simple ZnO, ZNNG exhibited stronger green emissions, but no ultraviolet (UV) emission peak was observed. Through a comprehensive analysis of ultraviolet–visible (UV–vis) absorption spectra, Mott Schottky (MS) plots, electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS) results, it was proved that the stable green emissions of ZnO and its composites originated from the quenching of electrons between Zn interstitial (Zni) and surface oxygen defects. The introduction of NiS@NiO caused the conduction band (CB) and valence band (VB) of ZnO to change to lower energy states, effectively increasing the absorption intensities of ZnO in the visible light, while introducing numerous oxygen-related defects on the surface of ZnO. Further addition of rGO effectively promoted the migration of electrons from the CB to the Fermi energy (Ef). These effects effectively increased the green emission of ZnO and reduced the UV emission. Finally, a proper mechanism for the near-zero band gap NiS@NiO/rGO that can significantly enhance the green emission of ZnO was proposed.
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影响因子：
9.9
作者：
Bing Xue;Yingquan Zou
通讯作者：
Bing Xue;Yingquan Zou
DOI：
10.1021/acs.jpcc.0c01078
发表时间：
2020-05
期刊：
The Journal of Physical Chemistry C
影响因子：
--
作者：
Miao Zhang;F. Averseng;J. Krafft;P. Borghetti;G. Costentin;S. Stankic
通讯作者：
Miao Zhang;F. Averseng;J. Krafft;P. Borghetti;G. Costentin;S. Stankic
影响因子：
3.1
作者：
Liu, Wei Meng;Li, Jin;Zhang, Hong Yan
通讯作者：
Zhang, Hong Yan
影响因子：
6.7
作者：
Bing Xue;Yingquan Zou
通讯作者：
Bing Xue;Yingquan Zou
影响因子：
6.7
作者：
Won-Kyu Han;S. G. Kang;T. W. Kim;Dongwan Kim;W. Cho
通讯作者：
Won-Kyu Han;S. G. Kang;T. W. Kim;Dongwan Kim;W. Cho