Journal
ACS NANO
Volume 3, Issue 7, Pages 1703-1710Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900223b
Keywords
ZnO nanoparticles; absorbance; particle size distribution; ripening rates; solubility
Categories
Funding
- German Research Council (DFG) [PE 427/11-2, PE 427/18-2]
- Excellence Initiative for the Cluster of Excellence Engineering of Advanced Materials
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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.
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