LaCoO3 Nanosystems by a Hybrid CVD/Sol–Gel Approach

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Abstract:

LaCoO3 nanosystems are receiving increasing attention for the development of innovative fuel cells and heterogeneous catalysts. In this report, we describe the synthesis of nanophasic LaCoO3 thin films by a hybrid chemical vapor deposition (CVD)/sol–gel (SG) approach. The adopted strategy consists in the CVDof La-O-based systems on SG cobalt oxide xerogels CoOx(OH)y at temperatures as low as 200 °C and in the subsequent thermal treatment in air (400–800 °C, 2–8 h). In this context, particular attention is devoted to achieving an intimate La/Co intermixing already in the as-prepared systems, in order to favor reactions yielding a single La-Co-O phase with uniform composition. The obtained results point out to the formation of pure and structurally homogeneous LaCoO3 nanosystems after annealing at 700 °C, 2 h, with a typical grain-like morphology. More severe thermal treatment resulted in the thermal decomposition of LaCoO3 nanocrystallites.

Keywords: CVD; LACOO3; NANOSYSTEMS; SOL-GEL; THIN FILMS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2005.099

Publication date: May 1, 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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