title: Grain-size effects on gas response in nanostructured Gd0.9Ba0.1CoO3.
abstract: The perovskite Gd(0.9)Ba(0.1)CoO3 was prepared via solution and solution-polymerization methods in aqueous media. The thermal decomposition of precursor powders produced well crystallized nanostructured materials possessing an extensive nanoporosity. The average particle size obtained by the solution route was 150 nm, whereas by the solution-polymerization method was 61 nm. The characterization of gas response, performed on thick-films, revealed that the electrical resistance variation increases with reducing grain size. In oxygen, the films prepared with powder of solution-polymerization registered an increment of 1000%, compared to the powder made by the solution route, whereas in carbon dioxide was 1100%.
authors: Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara, Jalisco 44410, Mexico. michelucr@yahoo.es
authors: Carlos R
authors: CR
authors: Michel
authors: Edgar
authors: E
authors: López Mena
authors: Alma H
authors: AH
authors: Martínez
mesh_terms: D001464:Barium / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis*; D003035:Cobalt / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D010316:Particle Size; D016062:Porosity; D033362:Powder Diffraction; D011208:Powders; D012680:Sensitivity and Specificity; D012996:Solutions; D013499:Surface Properties; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D011208:Powders; D012996:Solutions; D002245:Carbon Dioxide; D001464:Barium; D003035:Cobalt; D005682:Gadolinium; D010100:Oxygen; C060728:cobalt oxide