金属离子修饰的ZnS/PAMAM纳米复合材料的荧光性能研究

Fluorescent Labeling of Latent Fingerprints with Metallic Ions Modified ZnS/PAMAM Nano-Composites

用荧光分光光度法研究了Zn2+,Mn2+,Cd2+,Na+,K+,Ag+,Cu2+和Pb2+等金属离子修饰的ZnS/PAMAM树形分子纳米复合材料的荧光发射性能。结果表明:不同金属离子修饰效果不同。Zn2+,Mn2+和Cd2+修饰后,ZnS/PAMAM树形分子纳米复合材料的荧光发射强度有不同程度提高;Ag+,Cu2+和Pb2+的修饰对荧光有不同程度的猝灭作用;而Na+和K+的修饰对荧光发射无明显影响。与修饰前相比,Cd2+离子修饰的ZnS/PAMAM树形分子纳米复合材料标记的潜指纹发射的蓝色荧光更加明亮,与背景反差更加明显。这对提高潜指纹的显现精度和准确率有很好的借鉴价值。

Effects of metallic ions,such as Zn2＋,Mn2＋,Cd2＋,Na＋,K＋,Ag＋,Cu2＋ and Pb2＋,on the photoluminescence properties of ZnS（ZINC sulfide） QDs（quantum dots）/poly（amido amine）（PAMAM） dendrimer nanocomposites（NCs） with blue emission under the irradiation of UV light were studied.The results show that the effects of different metallic ions on the photoluminescence properties of the prepared ZnS QDs were different.Zn2＋,Mn2＋ and Cd2＋ ions enhance the PL（photoluminescence） intensity;Na＋ and K＋ ions don＇t change the PL intensity obviously while Ag＋,Cu2＋ and Pb2＋ quench it.Compared with ZnS/PAMAM NCs,fingerprints treated with ZnxCd（1-x）S/PAMAM NCs emitted brighter blue light,the contrast between Abstracts and fingerprints was more obvious,which shows good reference value for enhancing the resolving ability of fingerprints.