Title $V_{6}O_{13}$ films by control of the oxidation state from aqueous precursor to crystalline phase$V_{6}O_{13}$ films by control of the oxidation state from aqueous precursor to crystalline phase Author Peys, Nick Ling, Yun Dewulf, Daan Van Doorslaer, Sabine et al. Faculty/Department Faculty of Sciences. Physics Research group Biophysics and Biomedical Physics Spectroscopy in biophysics and catalysis (SIBAC) Publication type article Publication 2013London, 2013 Subject Chemistry Source (journal) Journal of the Chemical Society: Dalton transactions. - London Volume/pages 42(2013):4, p. 959-968 ISSN 0300-9246 1477-9226 1472-7773 ISI 000312659200019 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract An aqueous deposition process for V6O13 films is developed whereby the vanadium oxidation state is continuously controlled throughout the entire process. In the precursor stage, a controlled wet chemical reduction of the vanadium(V) source with oxalic acid is achieved and monitored by (51)Vanadium Nuclear Magnetic Resonance (V-51-NMR) and Ultraviolet-Visible (UV-Vis) spectroscopy. The resulting vanadium(IV) species in the aqueous solution are identified as mononuclear citrato-oxovanadate(IV) complexes by Electron Paramagnetic Resonance (EPR) and Fourier Transform Infra-Red (FTIR) spectroscopy. This precursor is successfully employed for the deposition of uniform, thin films. The optimal deposition and annealing conditions for the formation of crystalline V6O13, including the control of the vanadium oxidation state, are determined through an elaborate study of processing temperature and O-2 partial pressure. To ensure a sub 100 nm adjustable film thickness, a non-oxidative intermediate thermal treatment is carried out at the end of each deposition cycle, allowing maximal precursor decomposition while still avoiding V(IV) oxidation. The resulting surface hydrophilicity, indispensable for the homogeneous deposition of the next layer, is explained by an increased surface roughness and the increased availability of surface vanadyl groups. Crystalline V6O13 with a preferential (002) orientation is obtained after a post deposition annealing in a 0.1% O-2 ambient for thin films with a thickness of 20 nm. E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312659200019&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312659200019&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312659200019&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle