Open AccessStructural, optical and conductivity study of hydrothermally synthesized TiO2 nanorods
Author(s) -
N. Santhosh Kumar,
S. K. Naveen Kumar,
L. Yesappa
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab691f
Subject(s) - nanorod , materials science , dielectric , crystallinity , analytical chemistry (journal) , anatase , fourier transform infrared spectroscopy , thermogravimetric analysis , band gap , differential scanning calorimetry , field emission microscopy , nanotechnology , diffraction , chemical engineering , optics , photocatalysis , optoelectronics , chemistry , composite material , biochemistry , physics , chromatography , engineering , thermodynamics , catalysis
TiO 2 nanorods are synthesized by hydrothermal method using the commercially available TiO 2 nanopowder (P25) as a precursor. This work mainly focused on the study of the various properties and comparison among the P25, 20 mg TiO 2 nanorods and 40 mg TiO 2 nanorods by different characterizations. Fourier Transform Infrared Spectroscopy (FTIR) was carried out and the results confirmed the formation and presence of TiO 2 nanorods by shifting peak positions from 1433 cm −1 to 1424cm −1 and 1420cm −1 . The x-ray diffraction (XRD) results indicate that the crystallinity of TiO 2 nanorods increased significantly and was confirmed by the variation in the diffraction peak intensity and the peak at 2 θ = 25.23° is conformed the anatase phase. The Field Emission Scanning Electron Microscope (FESEM) images clearly show the formation and presence of TiO 2 nanorods. Thermogravimetric Analysis (TGA) and Differential Thermal Analysis (DTA) reveal that increasing in thermal stability and differential scanning calorimeter (DSC) evaluates the increase in melting temperature of TiO 2 nanorods. The UV–vis absorption spectra show the absorption peak redshift towards higher wavelength and it leads to expansion of optical activities of TiO 2 nanorods. The optical band gap energy was found to be decreased to 5.3, 5.2 and 4.9 eV for P25, 20 and 40 mg respectively. The dielectric constant has increased twice and the dielectric loss by almost ten times compared to dielectric constant and dielectric loss of the P25. The current versus voltage (I-V) characteristics show the linear curve which reveals the easy flow of current is more in TiO 2 nanorods. From the obtained results, it could be concluded that TiO 2 nanorods are suitable for potential applications.