Study of structure of the TiO{sub 2}–MoO{sub 3} bilayer films by Raman spectroscopy

• Published in: Materials research bulletin Vol. 60
• Main Authors: Santos, Elias de Barros, Sigoli, Fernando Aparecido, Mazali, Italo Odone
• Format: Journal Article
• Language: English
• Published: United States 15-12-2014
• Subjects: DIP COATING; LAYERS; MATERIALS SCIENCE; MOLYBDENUM OXIDES; ORGANOMETALLIC COMPOUNDS; ORTHORHOMBIC LATTICES; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SEMICONDUCTOR MATERIALS; SYNTHESIS; THIN FILMS; TITANIUM OXIDES; VARIATIONS
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2014.08.044

Highlights: • TiO{sub 2}–MoO{sub 3} bilayer thin films were easily prepared by dip-coating technique. • Ti and Mo metallo-organic compounds were used as source of its respective oxide. • TiO{sub 2} in anatase phase and orthorhombic phase of α-MoO{sub 3} were identified. • The bilayer structure was investigated by Raman spectroscopy. - Abstract: In this work, TiO{sub 2}–MoO{sub 3} films were easily prepared by dip-coating technique and metallo-organic decomposition process (MOD). Raman analyses indicate the formation of TiO{sub 2} in anatase phase and orthorhombic phase of α-MoO{sub 3}. It was observed that the Raman bands intensities attributed to TiO{sub 2} and MoO{sub 3} oxides were dependent on the number of decomposition–deposition cycles (DDC). The different number of DDC generates films with different thicknesses and the Raman signal was sensitive to this variation. Raman analyses provided qualitative information about the bilayer structure of the bi-component TiO{sub 2}–MoO{sub 3} films, which was confirmed by scanning electron microscopy. In this direction, the dip-coating technique and MOD process can be an efficient strategy to facile preparation of many samples to be used in applications.