LaCoO3 nanosystems by a hybrid CVD/sol-gel approach.
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.
Armelao
Lidia
L
ISTM-CNR and INSTM, Department of Chemistry, Padova University, Via Marzolo, 1-35131 Padova, Italy.
Barreca
Davide
D
Bottaro
Gregorio
G
Gasparotto
Alberto
A
Maragno
Cinzia
C
Tondello
Eugenio
E
Sada
Cinzia
C
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
D010087:Oxides; D003035:Cobalt; D007811:Lanthanum; C060728:cobalt oxide