碳纳米管/寡聚胸腺嘧啶复合体系与汞离子作用的光谱研究  

Spectroscopic Studies on the Interaction Between Carbon Nanotubes/Polythymine Oligonucleotide Composites and Mercury Ions

作　　者：叶丽英[1] 陈述[1] 岳明[1] 龙云飞[1] 

机构地区：[1]湖南科技大学化学化工学院理论化学与分子模拟省部共建教育部重点实验室,湘潭411201

出　　处：《光散射学报》2011年第1期46-51,共6页The Journal of Light Scattering

基　　金：湖南省自然科学基金(09JJ6021);湖南省教育厅资助项(10C0713);湖南省青年骨干教师培养资助项目

摘　　要：利用寡聚胸腺嘧啶核苷酸(PolyT)与碳纳米管(CNTs)之间的自发非共价修饰作用形成稳定的CNTs/PolyT纳米复合体系,采用共振光散射(RLS)和紫外-可见吸收光谱考察了该复合体系与汞离子的相互作用。实验结果表明,水相中单链PolyT能与CNTs形成稳定而均匀的分散体系,而单链PolyT极易捕获汞离子生成特异性的T-Hg-T双链结构,使其从CNTs上解离。此时,CNTs在电解质存在下会发生聚集并容易被离心而下沉,导致体系的RLS强度(IRLS)发生变化。不同浓度的汞离子能使复合体系的IRLS呈现梯度变化,并且其它金属离子与CNTs/PolyT的作用非常微弱。由此,可实现汞离子选择性定性、定量分析。The composite of Polythymine Oligonucleotide （PolyT） with Carbon Nanotubes （CNTs）, CNTs/PolyT, has been prepared by utilizing their spontaneous non-covalent interaction. The reaction between the CNTs/PolyT and mercury ions has been investigated by resonance light scattering （RLS） and UV-visible absorption spectra. The results indicate that the single-stranded PolyT and CNTs can form a stable and uniform dispersed system. The PolyT can specifically bind with mercury ions to form T-Hg-T complexes with double-stranded structure, which can not be adsorbed at the surface of CNTs and dissociated from the CNTs. Thus, CNTs aggregate in the presence of electrolytes and can be centrifuged easily, resulting in the change of RLS intensity of the suspending solution. Furthermore, the RLS intensity changes gradually with the concentration of mercury ions and the weak interaction between CNTs/PolyT with other metal ions demonstrate a sensitiveand selective analysis of mercury ions.

关 键 词：碳纳米管 寡聚胸腺嘧啶 共振光散射 汞离子 

分 类 号：O657.3[理学—分析化学]