Gd3+掺杂ZnO的制备及其性能

doi:10.11944/j.issn.1000-0518.2020.03.190175

摘要/Abstract

摘要：

为提高ZnO的光催化性和稳定性,扩展对光的吸收范围,以乙二胺四乙酸(H₄EDTA)为配体形成配位前驱体,通过低温热分解配位前驱体法制备了Gd³⁺掺杂ZnO复合物Zn_1-_xGd_xO₂(x=0~0.1)纳米颗粒。采用X射线粉末衍射(XRD)、红外光谱法(FT-IR)、扫描电子显微镜(SEM)、荧光光谱法(FL)、紫外可见漫反射光谱法(UV-Vis DRS)、交流阻抗(EIS)以及动态光电流响应(i-t)等多种手段研究掺杂比例对氧化锌物相、表面形貌、光学性以及光电响应性等的影响。结果表明,Gd³⁺掺杂摩尔分数低于3%时,产物为单相纤锌矿ZnO,提高掺杂比例(>3%)不仅使ZnO晶格萎缩,同时还出现少量Gd₂O₃第二相,且晶粒随掺杂摩尔分数的增加而降低。 Gd³⁺掺杂使ZnO能带结构发生改变,其价带、导带和带隙等各值都随着掺杂摩尔分数的增加而降低。 I-t结果表明,适量掺杂可提高ZnO的光电响应能力,其中掺杂摩尔分数1%所得ZnO的光电流密度最大(10 mA/m²)。甲基橙(MO)的光降解结果显示,Gd³⁺掺杂能提高ZnO的催光化性,其中1%掺杂对ZnO的催化性提高最大。最后还对ZnO的催化选择性和耐酸碱性进行了简单研究。

关键词: 氧化锌, 光催化剂, Gd³⁺, 掺杂, 光电响应

Abstract:

In order to improve photocatalytic activity and acid-resistant alkalinity of ZnO and expand the absorption range of light, nanosized ZnO particles doped with Gd³⁺ (Zn_1-_xGd_xO₂(x=0~0.1)) were synthesized by thermal decomposition of the coordinated precursor, in which ethylenediamine tetraacetic acid(H₄EDTA) is the ligand. Effects of the doping amount of Gd³⁺ on the structure, phase, morphology, optical properties and photo-electrical behaviors of ZnO were studied by X-ray diffraction (XRD) spectrometry, ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS), Fourier transform infrared (FT-IR) spectroscopy, flurescence spectroscopy (FL), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), dynamic photoelectrical current curve (i-t), etc. XRD results show that when the amount of Gd³⁺ is below 3%, there is a single phase of ZnO with hexagonal wurtzite structure. With the increase of Gd³⁺ doping(>3%), a little bit of second phase of Gd₂O₃ shows up and the grain size of ZnO is reduced. From i-t results, Gd³⁺ doping amount of 1% exhibits the biggest current density of 10 mA/m². With the increase of Gd³⁺ doping, the band structure of ZnO is changed, the value of conduction band (CB), valence band (VB) and band-gap value (E_g) of ZnO are all reduced. At the same time, photo-degradation results of methyl orange (MO) reveal that Gd³⁺ doping can enhance the photocatalytic activity of ZnO, and the suitable amount is 1%. The catalytic selectivity and acid-resistant alkalinity of ZnO and Gd-doped ZnO were also studied simply.

Key words: ZnO, photo-catalysis, Gd³⁺, doping, photoelectric response

张媛, 徐嘉鑫, 邓洪权, 蒋琪英. Gd³⁺掺杂ZnO的制备及其性能[J]. 应用化学, 2020, 37(3): 340-349.

ZHANG Yuan, XU Jiaxin, DENG Hongquan, JIANG Qiying. Preparation and Performance of Gd³⁺-Doped ZnO[J]. Chinese Journal of Applied Chemistry, 2020, 37(3): 340-349.

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Gd³⁺掺杂ZnO的制备及其性能

Preparation and Performance of Gd³⁺-Doped ZnO

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