Functionalized CdSe quantum dots as selective silver ion chemodosimeter
Functionalized CdSe quantum dots as selective silver ion chemodosimeter
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作者：
Liang, JG;Ai, XP;Pang, DW
制备了CdSe量子点，并用巯基乙酸对量子点进行了修饰.它们是水溶性和生物相容性的。为了提高其荧光强度和在水溶液中的稳定性，将牛血清白蛋白（BSA）吸附到其表面。基于pH 5.0时Ag（I）离子对功能化CdSe量子点在543 nm波长范围内的荧光信号的猝灭和在570 - 700 nm波长范围内的荧光信号的增强，提出了一种简单、快速、特异的测定Ag（I）的方法。与单一的有机荧光团相比，这些纳米颗粒更亮，更稳定，对光漂白，不遭受闪烁。在最佳条件下，Ag（I）的浓度在4.0 × 10（-7）~ 1.5 × 10（-5）mol L-1范围内与响应呈线性关系，检测限为7.0 × 10（-8）mol L-1。并对反应机理进行了讨论。
CdSe quantum dots (QDs) have been prepared and modified with mercaptoacetic acid. They are water-soluble and biocompatible. To improve their fluorescence intensity and stability in water solution, bovine serum albumin (BSA) was absorbed onto their surface. Based on the quench of fluorescence signals of the functionalized CdSe QDs in the 543 nm wavelength and enhancement of them in the 570 - 700 nm wavelength range by Ag(I) ions at pH 5.0, a simple, rapid and specific method for Ag( I) determination was proposed. In comparison with single organic fluorophores, these nanoparticles are brighter, more stable against photobleaching, and do not suffer from blinking. Under the optimum conditions, the response is linearly proportional to the concentration of Ag( I) between 4.0 x 10(-7) and 1.5 x 10(-5) mol L-1, and the limit of detection is 7.0 x 10(-8) mol L-1. The mechanism of reaction is also discussed.