基于能量转移机制的正、负功能团相互作用研究
首发时间:2012-05-07
摘要:制备一定尺寸的量子点和金纳米粒子,在量子点和金纳米粒子表面修饰具有相同碳原子数,不同正、负电性的功能配体,研究配体间电性作用和位阻效应对"量子点-金纳米粒子"体系荧光共振能量传递(FRET)过程的影响。采用透射电镜和紫外、荧光等方法对量子点和金纳米粒子的尺寸、形态及光学性质进行表征,并深入研究了末端的正、负电性功能团对FRET效率的影响,发现强的电性作用有利于提高体系FRET的效率,而位阻效应则降低该效率。研究可为纳米粒子的合理表面修饰,构建和研究生物传感器及探针系统提供参考。
关键词: 量子点 金纳米粒子 表面修饰 电性作用 能量转移 位阻效应
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Interaction Studies of Positive and Negative Functional Groups Based on the Energy Transfer Mechanism
Abstract:Size fixed quantum dots (QDs) and Au nanoparticles (AuNPs) were prepared with their surface modified by the functional ligands having the same number of carbon atoms but different terminal positive and negative charged functional groups. Transmission electron microscopy, UV and fluorescence spectrophotometer have been employed to characterize the morphology of particles and their optical properties. The static and steric effects on the FRET efficiency between QDs and AuNPs were studied. The results show that the strong static effent between terminally modified functional groups increases FRET efficiency, while the strong steric effect decreases it. The current study should be helpful for the design of nanoparticle surface modification and the construction of biological nano sensor.
Keywords: quantum dots gold nanoparticles surface modification static effect energy transfer steric effect
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