title
  

Synthesis and assembly of zinc oxide microcrystals by a low-temperature dissolution-reprecipitation process: lessons learned about twin formation in heterogeneous reactions

Warning The system is temporarily closed to updates for reporting purpose.

Hoffmann, Rudolf C. and Trapp, Maximilian and Erdem, Emre and Kratzer, Markus and Teichert, Christian and Kleebe, Hans-Joachim and Schneider, Jörg J. (2020) Synthesis and assembly of zinc oxide microcrystals by a low-temperature dissolution-reprecipitation process: lessons learned about twin formation in heterogeneous reactions. Chemistry - A European Journal (SI), 26 (42). pp. 9319-9329. ISSN 0947-6539 (Print) 1521-3765 (Online)

[img]
Preview
PDF (Open Access) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
2631Kb

Official URL: http://dx.doi.org/10.1002/chem.201904638

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.

Item Type:Article
Uncontrolled Keywords:cobalt; crystallization; doping; Langmuir-Blodgett films; mineralization; zinc oxide
Subjects:Q Science > QD Chemistry > QD450-801 Physical and theoretical chemistry
Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
ID Code:41092
Deposited By:Emre Erdem
Deposited On:24 Sep 2020 09:48
Last Modified:24 Sep 2020 09:48

Repository Staff Only: item control page