Rucha Desai

THE SYNTHESIS OF TiO2 NANOPARTICLES BY WET-CHEMICAL METHOD AND THEIR PHOTOLUMINESCENCE, THERMAL AND VIBRATIONAL CHARACTERIZATIONS: EFFECT OF GROWTH CONDITION

Low temperature calcination methods have been developed to obtain anatase TiO2 nanocrystals using three different synthesis routes. The DSC thermograms have been used to set the annealing temperature. Various size of TiO2 nanocrystals ranging from 8 nm to 16.5 nm have been used to synthesize by setting up the annealing temperature and time. The X-ray diffraction (XRD) and Raman spectrum have been used to identify and confirm the anatase crystal structure having long range ordering. The photoluminescence (PL) spectra have been recorded as a function of particle size and excitation power, which is attributed to the defects inside the grain that can migrate into the grain surface region during annealing. In a typical TiO2 nanocrystals (sample TN12), luminescence efficiency increases with the decrease in size due to e-/h+ recombination process.

Size Distribution of Silver Naoparticles: UV-Visible Spectroscopic Assessment

Size Distribution of Silver Nanoparticles: UV-Visible Spectroscopic Assessment Rucha Desai1, Venu Mankad2, Sanjeev K. Gupta2, and Prafulla K. Jha2 ∗ 1Nanoscience and Technology Department, P D Patel Institute of Applied Sciences, Charotar University of Science and Technology (CHARUSAT), CHARUSAT Campus, Changa-388421, Gujarat, India 2Department of Physics, Bhavnagar University, Bhavnagar-364022, India

Effect of Annealing Time on Synthesis of Titanium Dioxide Nanocrystals Studied by Raman and Photoluminescence Spectroscopy

The Raman spectroscopic and photoluminescence measurement of anatase TiO2 nanocrystals synthesized by wet chemical method is carried out at different annealing time. X‐ray diffraction and Raman spectroscopy are used to confirm the anatase crystal structure for different sample. The first Eg optical phonon shows systematic blueshift with variation in annealing time, which is attributed to the phonon confinement effects. However, in photoluminescence spectra observed peak do not vary with annealing time, while intensity varies.

Thermal Analysis of Nanocrystallization of Anatase TiO2

In the present paper, nanosized titanium dioxide (TiO2) is synthesized by wet‐chemical technique, and characterized by x‐ray diffraction (XRD), Fourier transform infrared reflectance (FTIR) and differential scanning calorimeter (DSC) thermograms. DSC thermogram shows a definite exothermic peak indicating the transformation from amorphous to crystalline phase. The FTIR spectra shows main peak around 1384 cm−1, which is attributed to the Ti‐O bond in both the i.e. amorphous and crystalline samples.