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Direct processing of porous nano-structured ZnO-CoOx films
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
2007 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, no 20-21, 7751-7757 p.Article in journal (Refereed) Published
Abstract [en]

Highly porous nano-structured films and powders of ZnO:Co (0–5 metal% Co) or ZnO:Co and (Zn,Co)3O4 (10–35% Co) particles were obtained by deposition of mixed Zn- and Co-methoxy-ethoxide precursors on spinning or non-spinning substrates, and heating to 600 °C. The Co- and Zn-methoxy-ethoxide solutions were prepared by metathesis of CoCl2 and potassium methoxy-ethoxide, and reaction of diethylzinc and methoxy-ethanol, respectively. Compositions in the range 0–35% Co were investigated by IR spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and X-ray diffraction. The gels obtained consisted of hydrated amorphous oxo-carbonates and were of good elemental homogeneity in the TEM. Thermogravimetric analysis showed that all residual groups had been removed at 550–600 °C, 5 °C min− 1. The materials heated to 600 °C contained ZnO of the hexagonal modification with cell-edges in close agreement with un-doped ZnO regardless of composition and temperature. TEM-EDS studies showed that the ZnO:Co and (Zn,Co)3O4 spinel particles were well mixed, of similar shape and size, ca 10–25 nm. Heating of the 10% Co sample to 800 °C decomposed the spinel phase and left Co-doped ZnO.

Place, publisher, year, edition, pages
2007. Vol. 515, no 20-21, 7751-7757 p.
Keyword [en]
Sol–gel, Cobalt doped ZnO, Nano-structured porous, Film
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-27524DOI: 10.1016/j.tsf.2007.03.145ISI: 000249308400006OAI: oai:DiVA.org:uu-27524DiVA: diva2:55419
Available from: 2007-08-14 Created: 2007-08-14 Last updated: 2017-12-07Bibliographically approved

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Westin, GunnarPohl, AnnikaOttosson, Mikael

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