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Synthesis and Assembly of Zinc Oxide Microcrystals by a Low‐Temperature Dissolution–Reprecipitation Process: Lessons Learned About Twin Formation in Heterogeneous Reactions

Hoffmann, Rudolf C. ; Trapp, Maximilian ; Erdem, Emre ; Kratzer, Markus ; Teichert, Christian ; Kleebe, Hans‐Joachim ; Schneider, Jörg J. (2022):
Synthesis and Assembly of Zinc Oxide Microcrystals by a Low‐Temperature Dissolution–Reprecipitation Process: Lessons Learned About Twin Formation in Heterogeneous Reactions. (Publisher's Version)
In: Chemistry – A European Journal, 26 (42), pp. 9319-9329. Wiley-VCH Verlag GmbH & Co. KGaA, ISSN 0947-6539,
DOI: 10.26083/tuprints-00020493,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Synthesis and Assembly of Zinc Oxide Microcrystals by a Low‐Temperature Dissolution–Reprecipitation Process: Lessons Learned About Twin Formation in Heterogeneous Reactions
Language: English
Abstract:

Cobalt-doped zinc oxide single crystals with the shape of hexagonal platelets were synthesized by thermohydrolysis of zinc acetate, cobalt acetate, and hexamethylenetetramine (HMTA) in mixtures of ethanol and water. The mineralization proceeds by a low-temperature dissolution–reprecipitation process from the liquid phase by the formation of basic cobalt zinc salts as intermediates. The crystal shape as well as twin formation of the resulting oxide phase can be influenced by careful choice of the solvent mixture and the amount of doping. An understanding of the course of the reaction was achieved by comprehensive employment of analytical techniques (i.e., SEM, XRD, IR) including an in-depth HRTEM study of precipitates from various reaction stages. In addition, EPR as well as UV/Vis spectroscopic measurements provide information about the insertion of the cobalt dopant into the zincite lattice. The Langmuir–Blodgett (LB) technique is shown to be suitable for depositing coatings of the platelets on glass substrates functionalized with polyelectrolyte multilayers and hence is applied for the formation of monolayers containing domains with ordered tessellation. No major differences are found between deposits on substrates with anionic or cationic surface modification. The adherence to the substrates is sufficient to determine the absolute orientation of the deposited polar single crystals by piezoresponse force microscopy (PFM) and Kelvin probe force microscopy (KPFM) studies.

Journal or Publication Title: Chemistry – A European Journal
Volume of the journal: 26
Issue Number: 42
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
Date Deposited: 16 Feb 2022 13:32
Last Modified: 16 Feb 2022 13:32
DOI: 10.26083/tuprints-00020493
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-204938
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20493
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