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

Abstract In this work, TiO 2 –MoO 3 films were easily prepared by dip-coating technique and metallo-organic decomposition process (MOD). Raman analyses indicate the formation of TiO 2 in anatase phase and orthorhombic phase of α-MoO 3 . It was observed that the Raman bands intensities attributed to TiO 2 and MoO 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 2 –MoO 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.