巯基化壳聚糖修饰CdTe量子点粉末的潜指纹显现

Synthesis of CdTe quantum dots modified with thiolated chitosan and its application in development of latent fingerprints

对分子量约为10万的壳聚糖经水解得到的水溶性低分子量壳聚糖,用巯基乙酸对其进行巯基化后为稳定剂,合成了巯基化壳聚糖修饰的CdTe量子点溶液。荧光光谱表征表明,合成的量子点溶液最大发射波长为546nm;将巯基化壳聚糖修饰的CdTe QDs溶液经离心、干燥得到量子点粉末。所制备粉末用于"502"熏蒸后玻璃、铝片、铜片上的潜指纹显现及未熏蒸铝片、纸币上的潜指纹显现,均取得高对比度的指纹显现效果。

Water-soluble low molecular weight chitosan was obtained by hydrolyzing chitosan with100,000 Daltions.The chitosan modified by thioglycolic acid was used as a stabilizer for CdTe quantum dots（CdTe QDs）.Fluorescence emission spectra show that the maximum emission wavelength of the prepared QDs is 546 nm.CdTe QDs powder was prepared by centrifuging the QDs solution and drying the obtained precipitation.The prepared CdTe QDs could develop latent fingerprints on glass,aluminum and copper plates pretreated with α-cyanoacrylate fuming.Addtionally,the latent fingerprints on aluminum plate and paper currency could be directly developed with CdTe QDs in absence ofα-cyanoacrylate fuming.