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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Schindler T, Walter J, Peukert W, Segets D, Unruh T
Zeitschrift: The Journal of Physical Chemistry B
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2015
Band: 119
Heftnummer: 49
Seitenbereich: 15370-15380
ISSN: 1520-5207
Sprache: Englisch


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.



FAU-Autoren / FAU-Herausgeber

Peukert, Wolfgang Prof. Dr.-Ing.
Schindler, Torben
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Professur für Nanomaterialcharakterisierung (Streumethoden)
Segets, Doris Dr.-Ing.
Exzellenz-Cluster Engineering of Advanced Materials
Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)
Walter, Johannes Dr.-Ing.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik


Zusätzliche Organisationseinheit(en)
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

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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Zuletzt aktualisiert 2018-06-08 um 16:08