Abstract
The effect of Mn dopant on the electronic structure and magnetic properties of SnO2 quantum dots was investigated using X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS), electron paramagnetic resonance, and first-principles modeling. The results demonstrated that dilute Mn atoms substituted for Sn generates numerous oxygen vacancies. Interestingly, lower Mn doping concentration (2%) favored the formation of Mn3+ structures and increase of Mn doping to higher concentration (10% Mn) led to predominance of Mn3+ with a small fraction of Mn2+ configuration. The slight increase in bond length observed for 10% Mn doped SnO2 QDs in EXAFS also corroborates with the XANES results where the absorption edge was shifted to lower energy, giving an indication of a very small presence of Mn in the +2 oxidation state. Electron paramagnetic resonance studies revealed the exchange coupled Mn interactions and also changes in distribution of local magnetic configurations with the ...
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