Controllable synthesis and optical properties of SnO2 core-shell microspheres

Haitao Chen,Xianghua Zeng,Jun Zhu,Dan Zhang,Xiaobing Chen,Guoshuai Chen

Micro & Nano Letters, IET （2014）

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摘要

SnO2 core-shell microspheres were synthesised via a hydrothermal method with hexamethylenetetramine as a surfactant. The structure and the morphology of the products were characterised by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. The results indicated that the overall dimension of the core-shell microspheres and the diameter of the spherical nuclei could be adjusted by changing the concentration of NaOH and hexamethylenetetramine or the reaction time. Based on the time dependent reactions, a possible growth mechanism is proposed. It is believed that the Kirkendall effect plays an important role in the formation of the core-shell structure. The optical properties of the core-shell structure microspheres were also studied through the photoluminescence and the Raman spectra.

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关键词

raman spectra,x-ray diffraction,chemical interdiffusion,crystal growth from solution,crystal morphology,field emission electron microscopy,photoluminescence,scanning electron microscopy,semiconductor growth,semiconductor materials,tin compounds,kirkendall effect,naoh concentration,sno2,core-shell microsphere dimension,core-shell microsphere synthesis,field-emission scanning electron microscopy,hexamethylenetetramine surfactant,hydrothermal method,optical properties,product morphology,reaction time,spherical nuclei diameter,structural property,time dependent reactions,transmission electron microscopy

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