Journal article
(Original article)


In Situ Study on the Evolution of Multimodal Particle Size Distributions of ZnO Quantum Dots: Some General Rules for the Occurrence of Multimodalities


Publication Details
Author(s): Schindler T, Walter J, Peukert W, Segets D, Unruh T
Publisher: American Chemical Society
Publication year: 2015
Volume: 119
Journal issue: 49
Pages range: 15370-15380
ISSN: 1520-5207
Language: English

Abstract

Properties of small semiconductor nanoparticles (NPs) are strongly governed by their size. Precise characterization is a key requirement for tailored dispersities and thus for high-quality devices. Results of a careful analysis of particle size distributions (PSDs) of ZnO are presented combining advantages of UV/vis absorption spectroscopy, analytical ultracentrifugation, and small-angle X-ray scattering (SAXS). Our study reveals that careful cross-validation of these different methods is mandatory to end up with reliable resolution. PSDs of ZnO NPs are multimodal on a size range of 2-8 nm, a finding that is not yet sufficiently addressed. In the second part of our work the evolution of PSDs was studied using in situ SAXS. General principles for the appearance of multimodalities covering a temperature range between 15 and 45 °C were found which are solely determined by the aging state indicated by the size of the medium-sized fraction. Whenever this fraction exceeds a critical diameter, a new multimodality is identified, independent of the particular time-temperature combination. A fraction of larger particles aggregates first before a fraction of smaller particles is detected. Fixed multimodalities have not yet been addressed adequately and could only be evidenced due to careful size analysis.



How to cite
APA: Schindler, T., Walter, J., Peukert, W., Segets, D., & Unruh, T. (2015). In Situ Study on the Evolution of Multimodal Particle Size Distributions of ZnO Quantum Dots: Some General Rules for the Occurrence of Multimodalities. The Journal of Physical Chemistry B, 119(49), 15370-15380. https://dx.doi.org/10.1021/acs.jpcb.5b08005

MLA: Schindler, Torben, et al. "In Situ Study on the Evolution of Multimodal Particle Size Distributions of ZnO Quantum Dots: Some General Rules for the Occurrence of Multimodalities." The Journal of Physical Chemistry B 119.49 (2015): 15370-15380.

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