Effect of oxygen working pressure on morphology and luminescence properties of SnO2 micro/nanocrystals formed by thermal evaporation method
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The effect of oxygen pressure in the synthesis of SnO2 micro/nanocrystals through thermal evaporation of Sn powder wasinvestigated. The thermal evaporation process was performed at 1000 oC for 1 hr under various oxygen pressures. Thepressure of oxygen changed from 10 to 500 Torr. The morphology of SnO2 crystals changed drastically with oxygen pressure. SnO2 nanoparticles with an average diameter of 120 nm were formed at oxygen pressure lower than 10 Torr. SnO2 nanowireswere grown under an oxygen pressure of 100 Torr. The nanowires have diameters in the range of 100 ~ 500 nm and lengthsof several tens of micrometers. As increasing the oxygen pressure to 500 Torr, the sizes of wires increased. A strong visibleemission peak centered at about 500 ~ 600 nm was observed in the room temperature cathodoluminescence spectra of all theproducts.
Abstract
The effect of oxygen pressure in the synthesis of SnO2 micro/nanocrystals through thermal evaporation of Sn powder wasinvestigated. The thermal evaporation process was performed at 1000 oC for 1 hr under various oxygen pressures. Thepressure of oxygen changed from 10 to 500 Torr. The morphology of SnO2 crystals changed drastically with oxygen pressure. SnO2 nanoparticles with an average diameter of 120 nm were formed at oxygen pressure lower than 10 Torr. SnO2 nanowireswere grown under an oxygen pressure of 100 Torr. The nanowires have diameters in the range of 100 ~ 500 nm and lengthsof several tens of micrometers. As increasing the oxygen pressure to 500 Torr, the sizes of wires increased. A strong visibleemission peak centered at about 500 ~ 600 nm was observed in the room temperature cathodoluminescence spectra of all theproducts.
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