Determination of the size of quantum dots by fluorescence spectroscopy
Determination of the size of quantum dots by fluorescence spectroscopy
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DOI：
10.1039/c0an00802h
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发表时间：
2011-01-01
期刊：
影响因子：
4.2
通讯作者：
Radotic, Ksenija
中科院分区：
文献类型：
--
作者：
Mutavdzic, Dragosav;Xu, Jianmin;Radotic, Ksenija
一直缺乏快速、简单和可靠的方法来测定纳米颗粒的尺寸。利用荧光光谱的最大值位置对疏水性量子点（CdSe）和亲水性量子点（CdSe/ZnS）的尺寸进行了研究。已经发现，荧光光谱法是一种简单可靠的方法来估计两种量子点类型的大小。对于给定的溶液，量子点尺寸的均匀性与荧光最大值位置（FMP）和量子点尺寸之间的关系相关。这种方法可以扩展到其他荧光纳米粒子。采用演化因子分析和多元曲线分辨率交替最小二乘法对通过特定测量程序记录的一系列量子点荧光光谱进行分解，揭示了具有不同直径的量子点分数的数量。特定组中的量子点的尺寸由分解光谱中对应分量的FMP定义。这些结果表明，结合荧光和适当的统计方法来分解纳米颗粒的发射光谱，可能是一种快速和可靠的方法，用于筛选其溶液的不均匀性。
There has been a lack of quick, simple and reliable methods for determination of nanoparticle size. An investigation of the size of hydrophobic (CdSe) and hydrophilic (CdSe/ZnS) quantum dots was performed by using the maximum position of the corresponding fluorescence spectrum. It has been found that fluorescence spectroscopy is a simple and reliable methodology to estimate the size of both quantum dot types. For a given solution, the homogeneity of the size of quantum dots is correlated to the relationship between the fluorescence maximum position (FMP) and the quantum dot size. This methodology can be extended to the other fluorescent nanoparticles. The employment of evolving factor analysis and multivariate curve resolution-alternating least squares for decomposition of the series of quantum dots fluorescence spectra recorded by a specific measuring procedure reveals the number of quantum dot fractions having different diameters. The size of the quantum dots in a particular group is defined by the FMP of the corresponding component in the decomposed spectrum. These results show that a combination of the fluorescence and appropriate statistical method for decomposition of the emission spectra of nanoparticles may be a quick and trusted method for the screening of the inhomogeneity of their solution.