Open AccessTiO2 thin films: Impact of substrate temperature on structural and morphological properties
Author(s) -
R. Suresh,
Sruthy Subash,
Thirumal Valavan K,
Justin Paul M,
Indira Priyadharshini T
Publication year - 2020
Publication title -
nanonext
Language(s) - English
Resource type - Journals
ISSN - 2582-8622
DOI - 10.34256/nnxt2014
Subject(s) - materials science , thin film , anatase , crystallite , composite material , tetragonal crystal system , shrinkage , substrate (aquarium) , nucleation , chemical engineering , crystallography , nanotechnology , crystal structure , metallurgy , chemistry , biochemistry , oceanography , organic chemistry , photocatalysis , geology , engineering , catalysis
Smooth and white spherical shaped TiO2 thin films are successfully deposited by Nebulizer Spray Pyrolysis (NSP) technique. The TiO2 thin films are characterized by XRD, SEM, DRS, PL and I-V analysis. Anatase phase polycrystalline tetragonal structure with preferential orientation along (1 0 1) direction obtained form XRD. The expansion and contraction of Ti-O bonds leads to a high crystalline nature with its purity at 289 nm. The absorbance increases with substrate temperature due to the decrease of film thickness, packing density and shrinkage of spray droplets. TiO2 thin films indicate that the film is made up of small granules having slab like particles with some voids at lower temperature. The tiny particles are combined together to form white spherical shaped flower particles with pinholes at 450oC. A room temperature resistivity of the film deposited at 400oC is found to be in the order of 105 Ω/cm, which decreases to 103 Ω/cm for the films prepared at 450oC.