Determination of size and concentration of gold nanoparticles from UV-Vis spectra
Determination of size and concentration of gold nanoparticles from UV-Vis spectra
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DOI：
10.1021/ac0702084
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发表时间：
2007-06-01
影响因子：
7.4
通讯作者：
Fernig, David G.
中科院分区：
文献类型：
--
作者：
Haiss, Wolfgang;Thanh, Nguyen T. K.;Fernig, David G.
利用多极散射理论，对球形金纳米粒子的光学性质与粒径和波长的关系进行了理论分析，其中对金的复折射率进行了修正，以减小小粒子中传导电子的平均自由程.为了将这些理论结果与实验数据进行比较，合成了尺寸范围为5至100 nm的金纳米颗粒，并用TEM和UV-vis进行了表征。理论与实验结果吻合良好。结果表明，这里产生的数据可以用来确定直接从紫外可见光谱的金纳米粒子的大小和浓度。为此目的的方程推导，并讨论了各种方法的精度。本工作的主要目的是提供一种简单、快速的方法来测定纳米颗粒的尺寸和浓度。
The dependence of the optical properties of spherical gold nanoparticles on particle size and wavelength were analyzed theoretically using multipole scattering theory, where the complex refractive index of gold was corrected for the effect of a reduced mean free path of the conduction electrons in small particles. To compare these theoretical results to experimental data, gold nanoparticles in the size range of 5 to 100 nm were synthesized and characterized with TEM and UV-vis. Excellent agreement was found between theory and experiment. It is shown that the data produced here can be used to determine both size and concentration of gold nanoparticles directly from UV-vis spectra. Equations for this purpose are derived, and the precision of various methods is discussed. The major aim of this work is to provide a simple and fast method to determine size and concentration of nanoparticles.