DNACdS纳米粒子复合体系的光谱和光电化学性质.pdfVIP

理化学学报(Wuli Huaxue Xuebao) May Acta Phys. Chim. Sin., 2008, 24(5) ：749-754 749 [Article] DNA/CdS 纳米粒子复合体系的光谱和光电化学性质 巧琳 周剑章 梁金玲 林玲玲 林仲华 (厦门大学化学化工学院化学系, 固体表面 理化学国家重点实验室, 福建厦门 361005) 摘要： 在水溶液中以DNA 作为模板和稳定剂, 构筑了DNA 与CdS 纳米粒子复合体系(DNA/CdS NPC), 研究 DNA 的含量, 单双链等对复合体系光电响应的影响, 并综合TEM, UV Vis, IR 和荧光光谱等对其形貌和光谱性 质进行表征. 结果表明, CdS 纳米粒子(CdS NPs)与DNA 链之间主要通过静电作用结合; DNA 模板对CdS NPs 的禁带宽度没有影响; 以DNA 模板合成的CdS NPs 具有较高的表面态密度, 其对CdS NPs 的荧光有增强作用, 而对光电流响应有抑制作用, 并且DNA 在复合体系中的含量影响荧光增强和光电流减弱的程度. 该复合体系 在荧光标记检测和DNA 的定量分析方面可能具有应用前景. 关键词： DNA/CdS 纳米粒子复合体系; 光电化学性质; 光谱性质 中图分类号： O646 Spectroscopic and Photoelectrochemical Properties of DNA/CdS Nanoparticle Composites CHEN Qiao Lin ZHOU Jian Zhang LIANG Jin Ling LIN Ling Ling LIN Zhong Hua (State Key Laboratory of Physical Chemistry of Solid Surf aces, Dep artment of Chemistry, College of Chemistry and Chemical Engineering, X iamen University, Xiamen 361005, Fuji an Province, P. R. China) Abstract ： DNA/CdS nanoparticle composites (DNA/CdS NPC) containing single or double strands and different concentrations of DNA were constructed in aqueous solutions. The effect of DNA on the photoelectrochemical properties of DNA/CdS NPC was investigated and the spectroscopic properties of DNA/CdS NPC were characterized by TEM, UV Vis, IR, and fluorescent spectrometry. The results showed that CdS nanoparticles (CdS NPs) were combined with DNA strands through the electrostatic interaction; DNA templates did not affect th