CdS纳米粒子与半胱氨酸相互作用的研究  

Interaction Between CdS Nanoparticles and Cysteine

作　　者：刘辉[1] 李文友[1] 尹洪宗[1] 何锡文[1] 梅芳[1] 陈朗星[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《高等学校化学学报》2005年第9期1618-1622,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20375017;20445001和20375019);高等学校博士学科点专项科研基金(批准号:2002055002);天津市自然科学基金(批准号:033603511)资助.

摘　　要：合成了粒径均匀和分散性好的CdS纳米粒子.通过改变CdS纳米粒子及半胱氨酸的浓度、体系的pH值及CdCl2和CH3CSNH2摩尔比等实验条件跟踪监测了CdS纳米粒子光谱性质的变化,探讨了CdS纳米粒子与半胱氨酸之间的相互作用及化学反应机理.CdS nanoparticles were synthesized and their spectra properties were studied.At the same time, the interaction mechanisms between CdS nanoparticles and cysteine and cysteine were investigated under different experimental conditions such as pH values, concentrations of cysteine and molar ratios of CdCl2, CH3CSNH2. After cysteine being added to the CdS nanoparticles, the fluorescence intensity of CdS nanoparticles was stronger and their emission peak did not change at pH before isoelectric point, while the fluorescence intensity became stronger at the beginning and then quenched and the emission peak was red-shifted at pH values after isoelectric point. It＇s proved that coordination interaction and electrostatic interaction were the two interaction forms between CdS and cysteine, which influenced the variations of fluorescence intensity, emission peak and bandgap of CdS nanoparticles at different pH balues before and after isoelectric point.

关 键 词：CDS纳米粒子 半胱氨酸 荧光光谱 

分 类 号：O657.3[理学—分析化学]