摘要
采用荧光发射法研究了不同Cd2+与树形分子的摩尔比(负载比)条件下硫化镉(CdS)/聚酰胺-胺(PAMAM)树形分子纳米复合材料(NCs)水溶液的荧光性能,并探索了其荧光产生的机理。结果表明:在波长330nm光的激发下,CdS/G4.0-NH2PAMAM NCs的荧光发射光谱中出现了2个峰,一个是PAMAM树形分子的荧光发射峰,另一个是CdS量子点的荧光发射峰。随着负载比的增加,前一个荧光发射峰逐渐变弱,并消失后一个荧光发射峰逐渐增强,表明PAMAM树形分子N原子上的价电子跃迁到CdS QDs上。发蓝色荧光的纯PAMAM树形分子水溶液对塑料表面的油印潜指纹显现效果不佳,原因是塑料含蓝色荧光杂质;采用负载比为10的CdS/G4.0-NH2PAMAM树形分子NCs水溶液显现塑料表面指纹时,发现潜指纹发射出明亮黄色荧光可以被清晰识别,这对含不同颜色荧光杂质的客体表面潜指纹的显现有很好的借鉴价值。
The photoluminescence property of CdS/PAMAM nanocomposites in water at different ratio of Cd2＋to PAMAM（r）was studied by fluorescence emission spectrum,and the according mechanism was explored.The results indicate that in the irra-diation of UV light at the wavelength of 330nm,two peaks were shown in the fluorescence emission spectrum of CdS/PAMAMnanocomposites.One peak was attributed to PAMAM dendrimers,and the another came from CdS QDs.The strength of thefrontier fluorescence emission peak became weaker and weaker,and at last disappeared with the enhancement of the ratio of Cd2＋to PAMAM;the strength of the latter fluorescence emission peak became stronger,which indicates that the electron at valenceband of N atom in amines of dendrimers was transferred to CdS QDs.Oil latent finger marks deposited on transparent adhesivetapes surface treated with pure PAMAM solution with blue photoluminescence was not clear enough because of the blue lightemitted from the impurity in adhesive tapes;Latent finger marks emitted strong yellow light and were successfully detected withgood resolving rate with CdS/dendrimer solution with r of 10,which shows good reference value for detecting finger marks onsurfaces with impurities emitting different photoluminescence colors.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期3311-3314,共4页
Spectroscopy and Spectral Analysis
基金
国家科技支撑计划项目(2007BAK26B08)
北京市重点学科建设专项资金项目(19005016029)资助
关键词
荧光
光致发光
硫化镉
量子点
树形分子
指纹
Fluorescence
Photoluminescence
CdS（Cadmium sulfide）
QDs（Quantum Dots）
PAMAM（ polyamidoamine） dendrimers
Fingermarks
作者简介
靳玉娟，女，1983年生，北京工商大学材料与机械工程学院讲师e-mail：jinyujuan@th．btbu．edu．cn
通讯联系人e-mail：yjluo@bit．edu．cn
