Preparation of tin dioxide quantum dots dispersible in both water and oil with tunable crystal planes and sizes,and band gaps
Tin dioxide(SnO2)is an intrinsic semiconductor material with direct band gap of about 3.6 eV at room temperature.Because of the advantages of good chemical and thermal stability,high electron mobility and light transmittance,low cost,non-toxicity and environmental friendliness,SnO2 has been widely used in gas sensors,catalytic materials,electrode materials,photoelectric materials and solar cells.Aimed at the contradiction between the application requirement of SnO2 dispersible in both water and oil and commercial SnO2 dispersible only in water,a solvothermal crystallization method was developed to successfully prepare the SnO2 quantum dots(SnO2 QDs)dispersible in both water and oil solvents.By adjusting the solvothermal crystallization time(0～24 h),the crystal size,energy gap,and ratio of(110)plane of the obtained SnO2 QDs were modified in the ranges of 2.12～4.16 nm,3.72～4.15 eV and 12.6％～43.3％,respectively.The crystalline SnO2 QDs can be well dispersed in water,ethanol,ethyl acetate and other water or oily solvents as need ed,to form a yellow transparent solution,which is long-term stable at room temperature.
SnO2quantum dots materialcrystal plane modificationenergy gap regulation
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