Thakur P.Thakur A.Yadav K.2019-03-222024-08-132019-03-222024-08-132016Thakur P., Thakur A., Yadav K.(2016) Study of variation in the band gap with concentration of TiO2In (LaMnO3)1-x / (TiO2)x (where x = 0.0,0.1,0.2,0.3 and 0.4) nanocomposites0094243X10.1063/1.4946465https://kr.cup.edu.in/handle/32116/2060In this paper(LaMnO3)1-x/ (TiO2) x (where x = 0.0, 0.1, 0.2, 0.3 and 0.4) nanocomposite are prepared by mixing the LaMnO3 and TiO2 (Sigma Chemicals, particle size ?21 nm) nanoparticle in appropriate ratio. These samples were characterized by using FESEM, EDS and FTIR to study the optical properties. Field Emission Scanning Electron Microscopy (FESEM) image of pure LaMnO3 sample shows that the uniform particle size distribution is observed. The average particle size of the LaMnO3 nanoparticles is 43 nm. The crystallite size increases from 16-24 nm with increasing the weight percentage of TiO2 in LaMnO3/TiO2 nanocomposite up to x = 0.4. The Fourier transform infrared spectroscopy (FTIR) spectra show that the absorption peaks appear at 450 cm-1 and 491 cm-1 which represent the Mn-O bending and Ti-O stretching mode respectively. The broadening of these peaks with increasing the concentration of TiO2 is also observed. It gives an evidence for the formation of metal oxygen bond. The absorption band at 600 cm-1 corresponds to the stretching mode, which indicates the pervoskite phase present in the sample. The values of band gap are found 2.1, 1.9, 1.5, 1.3 and 1.2 eV for the x = 0.0, 0.1, 0.2, 0.3, and 0.4 respectively. Thus, the decrease in band gap and increase in refractive index with increasing concentration of TiO2 has been observed. These prepared nanocomposites can be used in the energy applications, to make the electrical devices and as a catalyst for photocatalytic processes e.g. hydrogenation.Conference Paper