Swarnandhra College of Engineering and Technology

About: Swarnandhra College of Engineering and Technology is a based out in . It is known for research contribution in the topics: Thin film & Solar cell. The organization has 82 authors who have published 109 publications receiving 716 citations.

Investigation of structural and optical properties of pure and chromium doped TiO 2 nanoparticles prepared by solvothermal method

Abstract: This paper reports the synthesis of pure and Cr-doped TiO 2 nanoparticles with different doping concentrations by using a cost-effective solvothermal method. The as-synthesized nanoparticles were characterized by using X-ray diffraction, transmission electron microscopy and UV–Vis spectroscopy to study their structural and optical properties. The XRD pattern showed the prepared material is pure anatase of the crystalline phase. Using TEM measurement, the average particles size is found to be about 11–13 nm while selective area electron diffraction (SAED) patterns have confirmed the polycrystalline nature of the nanoparticles. The size of the crystallite is observed to be decreased with an increase in dopant (Cr) concentration. UV–Vis absorption spectra showed enhanced absorption in the visible range in accordance with the doping concentration of Cr with a red shift in the absorption edge. The band gap energy of doped nanoparticles decreases in accordance with an increase in dopant concentration due to the reduced particles size. This presented work would be useful to tune the optical properties of doped and undoped metal oxide TiO 2 for its optoelectronic applications.

Electrospinning process parameters dependent investigation of TiO2 nanofibers

Abstract: This paper reports the electrospinning fabrication and characterization of TiO2 nanofibers. Various electrospinning process parameters such as applied voltage, distance tip-collector, solution flow rate and polymer (PVP) concentration are studied. The prepared nanofibers were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric-differential thermal analysis (TG-DTA) and Fourier transform infrared spectroscopy (FTIR). XRD pattern of TiO2 nanofibers evidenced the presence of mixed phases of anatase and rutile. TG/DTA investigation showed the characteristic peaks corresponding to the heating behavior of TiO2-PVP mat. FTIR investigation endorsed a vibration peak at 660 cm−1 associated with the characteristic Ti O Ti bond. With the optimized process parameters, TiO2 nanofibers diameter was found to be reduced to 74 nm as compared to the first sample prepared with the diameter of 343 nm. Furthermore, these nanofibers were employed as the photoanode material for the preparation of dye-sensitized solar cell (DSSC) and photovoltaic study is evaluated.