Mashkovtsev Maxim A, Kosykh Anastasiya S, Ishchenko Alexey V, Chukin Andrey V, Kukharenko Andrey I, Troshin Pavel A, Zhidkov Ivan S
Institute of Physics and Technology, Ural Federal University, Mira Str. 21, 620002 Yekaterinburg, Russia.
M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi Str. 18, 620108 Yekaterinburg, Russia.
Nanomaterials (Basel). 2024 Oct 18;14(20):1675. doi: 10.3390/nano14201675.
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 SnO 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 SnO samples, except for the annealed sample with 2 mol.% Eu. The results of X-ray photoelectron spectroscopy (XPS) emphasized that europium incorporated into the SnO 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 SnO crystal lattice. Our findings provide new insight into the interaction of rare-earth metals (Eu) with host SnO matrix and new evidence for the importance of oxygen vacancies for optical and electronic structure formation.
研究了铕掺杂（0.5、1和2摩尔%）以及在缺氧气氛中退火对SnO纳米颗粒结构和光学性质的影响，并将其与电子结构相关联。X射线衍射（XRD）图谱显示，除了含2摩尔%铕的退火样品外，合成的和退火的铕掺杂SnO样品均为单相四方金红石结构。X射线光电子能谱（XPS）结果强调，铕以3+氧化态掺入SnO主体晶格，这伴随着在四价Sn的阳离子取代下形成氧空位。此外，XPS光谱显示，退火后O/Sn比降低，以产生额外的氧空位。脉冲阴极发光（PCL）证明了Eu位点对称性的浓度依赖性。XRD、XPS和PCL的结合表明，Eu掺杂和随后的退火会强烈诱导SnO晶格的无序化。我们的研究结果为稀土金属（Eu）与主体SnO基质的相互作用提供了新的见解，并为氧空位对光学和电子结构形成的重要性提供了新的证据。
