Abstract
Mn-doped SnO2 quantum dots (QDs) with different Mn concentrations were prepared by solution combustion synthesis. The crystallite size was under 5nm was confirmed from XRD and HR-TEM. A considerable decrease in band gap energy was observed with the increase in Mn content. The PL spectra show orange emission at about 590nm due to the ultra-small crystallite size and crystal defects of SnO2 QDs. The photocatalytic degradation of MO dye was measured under visible light irradiation using the Mn-doped SnO2 QDs as catalysts. 3mol% Mn-doped SnO2 QDs showed the 17 times higher photocatalytic performance than SnO2 QDs within 240min.
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