A Solution Synthetic Route to Nanophase Cobalt Film and Sponge
2005 (English)In: Chem. Mater, Vol. 17, 199-205 p.Article in journal (Refereed) Published
An efficient, low-cost solution-chemical route to nanophase cobalt as dense films and sponges has been developed. Co(NO3)2·6H2O and Co(OAc)2·4H2O were mixed with triethanolamine in methanol, and the solution was evaporated in air to a viscous liquid. Heating at 10 C min-1 to 470 and 500 C yielded highly porous sponges consisting of 3-6 and 9-11 nm sized face centered cubic (fcc) cobalt crystallites, respectively. Spin-coating on alumina and aluminum substrates with a 1 M Co-precursor solution and subsequent heating at 10 C min-1 to 500 C yielded dense films of <20 nm sized fcc cobalt crystallites. The microstructural and compositional evolution process on heating to form the cobalt metal was studied by TGA, DTA, and FT-IR spectroscopy, powder X-ray diffraction, TEM-EDS, and SEM-EDS. The C, N, and O contents could be kept low, 0.5, 0.02, and 0.2 wt %, respectively, at 700 C, but the carbon content could also reproducibly be adjusted to up to 13 wt % C in excess, by varying the precursor composition.
Place, publisher, year, edition, pages
2005. Vol. 17, 199-205 p.
IdentifiersURN: urn:nbn:se:uu:diva-67878DOI: doi:10.1021/cm0494610OAI: oai:DiVA.org:uu-67878DiVA: diva2:95789