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以水为反应溶剂,采用NaBH_4还原SeO_2并与过量CdSO_4反应,制备CdSe量子点凝胶。所得CdSe量子点凝胶直接干燥即得到固态粉体,若用聚乙二醇或谷胱甘肽等作为分散修饰剂可方便的转化成相应的溶胶,制备方法快速简单、成本低。CdSe量子点凝胶、粉体、溶胶均具有良好的光致发光特性,且性质稳定。结果表明反应物CdSO_4与SeO_2用量的摩尔比(Cd/Se值)和反应温度影响CdSe量子点的荧光特性。当制备凝胶的Cd/Se值由2.4:1增加12:1时,CdSe量子点-聚乙二醇溶胶的荧光强度增加,荧光发射峰由560nm红移到610nm;当制备凝胶的反应温度由40℃增加到90℃时,CdSe量子点-聚乙二醇溶胶的荧光发射峰由560nm红移到600nm。CdSe量子点-聚乙二醇溶胶的荧光量子产率20%左右。
With water as the reaction solvent, SeB 2 was reduced with NaBH 4 and reacted with excess CdSO 4 to prepare CdSe QDs. The obtained CdSe quantum dot gel is directly dried to obtain a solid powder. The preparation method is simple and rapid, and the cost is low if polyethylene glycol or glutathione is used as a dispersion modifier and can be easily converted into a corresponding sol. CdSe QDs, powders and sol have good photoluminescence properties and stable properties. The results show that the molar ratio of CdSO 4 to SeO 2 (Cd / Se value) and the reaction temperature affect the fluorescence characteristics of CdSe QDs. When the Cd / Se value of the prepared gel was increased from 2.4: 1 to 12: 1, the fluorescence intensity of CdSe quantum dot-PEG sol increased and the fluorescence emission peak shifted from 560 nm to 610 nm. When the gel reaction temperature From 40 ℃ to 90 ℃, the CdSe QDs-PEG sol has a red emission shift from 560nm to 600nm. CdSe quantum dots - polyethylene glycol sol fluorescence quantum yield of about 20%.