title: LaCoO3 nanosystems by a hybrid CVD/sol-gel approach.
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 CVD of La-O-based systems on SG cobalt oxide xerogels CoOx(OH)y at temperatures as low as 200 degrees C and in the subsequent thermal treatment in air (400-800 degrees 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 degrees C, 2 h, with a typical grain-like morphology. More severe thermal treatment resulted in the thermal decomposition of LaCoO3 nanocrystallites.
authors: ISTM-CNR and INSTM, Department of Chemistry, Padova University, Via Marzolo, 1-35131 Padova, Italy.
authors: Lidia
authors: L
authors: Armelao
authors: Davide
authors: D
authors: Barreca
authors: Gregorio
authors: G
authors: Bottaro
authors: Alberto
authors: A
authors: Gasparotto
authors: Cinzia
authors: C
authors: Maragno
authors: Eugenio
authors: E
authors: Tondello
authors: Cinzia
authors: C
authors: Sada
mesh_terms: D003035:Cobalt / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D007811:Lanthanum / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000032:analysis / Q000737:chemistry*; D044367:Phase Transition; D012666:Semiconductors; D014835:Volatilization
chemical_list: D010087:Oxides; D003035:Cobalt; D007811:Lanthanum; C060728:cobalt oxide