Unraveling Oxygen Vacancies Effect on Chemical Composition, Electronic Structure and Optical Properties of Eu Doped SnO2.

IF 4.4 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Nanomaterials Pub Date : 2024-10-18 DOI:10.3390/nano14201675
Maxim A Mashkovtsev, Anastasiya S Kosykh, Alexey V Ishchenko, Andrey V Chukin, Andrey I Kukharenko, Pavel A Troshin, Ivan S Zhidkov
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引用次数: 0

Abstract

The influence of Eu doping (0.5, 1 and 2 mol.%) and annealing in an oxygen-deficient atmosphere on the structure and optical properties of SnO2 nanoparticles were investigated in relation to electronic structure. The X-ray diffraction (XRD) patterns revealed single-phase tetragonal rutile structure for both synthesized and annealed Eu-doped SnO2 samples, except for the annealed sample with 2 mol.% Eu. The results of X-ray photoelectron spectroscopy (XPS) emphasized that europium incorporated into the SnO2 host lattice with an oxidation state of 3+, which was accompanied by the formation of oxygen vacancies under cation substitution of tetravalent Sn. Moreover, XPS spectra showed the O/Sn ratio, which has been reduced under annealing for creating additional oxygen vacancies. The pulse cathodoluminescence (PCL) demonstrated the concentration dependence of Eu site symmetry. Combination of XRD, XPS and PCL revealed that Eu doping and following annealing induce strongly disordering of the SnO2 crystal lattice. Our findings provide new insight into the interaction of rare-earth metals (Eu) with host SnO2 matrix and new evidence for the importance of oxygen vacancies for optical and electronic structure formation.

揭示氧空位对掺杂 Eu 的二氧化锡的化学组成、电子结构和光学特性的影响。
研究了掺杂 Eu(0.5、1 和 2 mol.%)以及在缺氧气氛中退火对二氧化锡纳米粒子的结构和光学特性的影响,并将其与电子结构联系起来。X 射线衍射(XRD)图显示,合成和退火的 Eu 掺杂 SnO2 样品均为单相四方金红石结构,但 Eu 含量为 2 摩尔%的退火样品除外。X 射线光电子能谱(XPS)的结果表明,铕以 3+ 的氧化态掺入二氧化锡的主晶格中,同时在四价锡的阳离子置换作用下形成了氧空位。此外,XPS 光谱显示了 O/Sn 比率,该比率在退火过程中因产生更多氧空位而降低。脉冲阴极发光(PCL)显示了 Eu 位点对称性的浓度依赖性。结合 XRD、XPS 和 PCL 发现,Eu 掺杂和退火会导致二氧化锡晶格发生强烈的无序化。我们的研究结果为稀土金属(Eu)与宿主二氧化锡基体的相互作用提供了新的见解,也为氧空位在光学和电子结构形成中的重要性提供了新的证据。
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来源期刊
Nanomaterials
Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.50
自引率
9.40%
发文量
3841
审稿时长
14.22 days
期刊介绍: Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.
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