Analysis of Optical Absorbance Spectra for the Determination of ZnO Nanoparticle Size Distribution, Solubility, and Surface Energy
Analysis of Optical Absorbance Spectra for the Determination of ZnO Nanoparticle Size Distribution, Solubility, and Surface Energy
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DOI：
10.1021/nn900223b
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发表时间：
2009-07-01
期刊：
影响因子：
17.1
通讯作者：
Peukert, Wolfgang
中科院分区：
文献类型：
--
作者：
Segets, Doris;Gradl, Johannes;Peukert, Wolfgang
我们提出了一个模型来计算胶体ZnO纳米粒子的粒径分布（PSD）从他们的吸收光谱。使用本体ZnO的光学性质的文献值，并通过紧密结合模型（M）将UV-可见区域中的测量波长与不同的颗粒尺寸相关联，算法将吸收光谱解卷积为来自尺寸分数的贡献。我们发现从TEM图像和计算的PSD确定的尺寸分布之间的一个很好的协议。为了进一步验证，双峰PSD已被调查和方法来确定不仅粒径，但也引入固体浓度，我们将显示我们的模型的适用性，通过确定温度依赖性的熟化速率，这使得溶解度，表面张力和熟化的活化焓的计算。原则上，我们的方法是适用于不同的半导体nanciparticles在各种溶剂中，只要它们的体积特性是已知的，散射是可以忽略不计的。
We present a model to calculate particle size distributions (PSDs) of colloidal ZnO nanciparticles from their absorbance spectra. Using literature values for the optical properties of bulk ZnO and correlating the measurement wavelengths in the UV-visible regime with distinct particle sizes by a tight binding model (M), an algorithm deconvolutes the absorbance spectra into contributions from size fractions. We find an excellent agreement between size distributions determined from TEM images and the calculated PSDs. For further validation, bimodal PSDs have been investigated and an approach to determine not only particle size but also solid concentration is introduced, We will show the applicability of our model by the determination of temperature-dependent ripening rates, which enables the calculation of solubilities, surface tensions, and the activation enthalpy of ripening. In principle, our methodology is applicable to different semiconductor nanciparticles in various solvents as long as their bulk properties are known and scattering is negligible.