Sanjay Dahiya

Influences of Dopant Concentration on Crystallography, Optical and Electrical Properties of Cadmium Oxide Nanoparticles

Influences of Dopant Concentration on Crystallography, Optical and Electrical Properties of Cadmium Oxide Nanoparticles Cadmium oxide (CdO) nanoparticles doped with different amount of rare earth metal Neodymium (Nd) ions have been prepared by Chemical co precipitation method. The doping level was varied from [Nd/Cd] = 0.1 to 10 wt%. Crystallography analysis of these materials is carried out by X- ray diffraction (XRD) which reveals that average crystalline size is in nano region i.e. 30-30.8 nm. The synthesized nanomaterial was characterized by means of X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR), UV-Visible Spectroscopy (UV-Vis). Electrical properties were also studied as a function of dopant concentration. Present studies also investigate the effect of varying dopant concentration on morphology and topography of as prepared nanomaterial.

To study the effect of doping concentration of silver on structural and optical properties of cadmium oxide (CdO) nanostructure

The present work deals with study of structural and optical properties of Silver (Ag) doped Cadmium oxide (CdO) nanostructured synthesized by Chemical Co-precipitation Techniques followed by calcinations at small temperature. The doping concentrations were changing from 0.1 to 10 at% respectively. Structural analysis study of these calcined materials is carried out by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy(TEM). The optical properties of calcined samples were investigating by Fourier transformation infrared (FTIR)spectroscopy, UV-Visible Spectroscopy (UV-Vis). The structural properties analysis results revels that crystallite size are in the range of nano region and TEM results are quite in accordance with XRD results.

To study the effect of calcinations durations and temperature on optical and structural properties of MgO-CuO nanocomposites

The MgO-CuO nanocomposites has been synthesized by a sol-gel techniques based on precursor polyvinyl alcohol (PVA). In this work appropriate concentration of cupric nitrate, Magnisium nitrate and PVA are mixed with 50:50 ethanol water followed by heated to 80°C to form a homogeneous gel solution. The obtained gel was slowly heated at 100°C to evaporate the solvent to form a hard homogeneous gel. The hard gel was calcinated at temperature 600°C for 4 hrs and 6 hrs thereafter, crushed the material in agate-motar so that it is converted into fine powder form. The prepared nanocomposites have been characterized using X-Ray Diffraction (XRD), FTIR, UV-VIS spectroscopy, SEM etc. The size of MgO-CuO nanocomposites heated at 600°C for 4 hours and 6 hours evaluated by Debye Scherrer formula are 17.1 nm and 21.2 nm respectively and results show that Size of MgO-CuO nanocomposites increases with increase of calcinations durations. IR spectra is also used to determine purity of samples. Absorption spectra confirm the...

To study the effect of dopant NiO concentration and duration of calcinations on structural and optical properties of MgO-NiO nanocomposites

In present work Magnesium oxide (MgO) samples were doped with different concentration of Transition metal Nickel Oxide(NiO) by using Chemical co-precipitation method. The doping levels were varied from NiO (5%, 10%, 15%) and all the samples were calcined at 600°C for 4hrs and 8hrs respectively. Structural analysis of these calcined materials is carried out by X-ray diffraction (XRD) techniques which reveals that average crystalline sizes are in nano region i.e. 21.77nm-31.13 nm and tabulated in table 1. The powder of calcined samples were also characterized by using various other techniques i.e. Scanning Electron Microscopy (SEM), Fourier Transformation Infrared Spectroscopy (FTIR), UV-Visible spectroscopy, Transmission Electron Microscopy (TEM) etc. The effects of dopant concentration, calcined temperature, calcinations duration on samples were studied and also investigate the effect of varying dopant concentration on morphology and optical properties of calcined nanomaterials. From results it was observ...

OPTICAL AND SPECTROSCOPIC STUDIES OF Fe2O3-Bi2O3-B2O3:V2O5 GLASSES

The glasses of compositions xFe2O3⋅ (40 - x)Bi2O3⋅60B2O3⋅2V2O5 have been prepared by the standard melt-quenching technique. Amorphous nature of these samples is ascertained by XRD patterns. The presence of BO3 and BO4 units is identified by IR spectra of glass samples. The absorption edge (λcut-off) shifts toward longer wavelengths with an increase in Fe2O3 content in the glass matrix. The values of optical band gap energy for indirect allowed and forbidden transitions have been determined and it is found to decrease with increase in transition metal ions. The Urbachs energy is used to characterize the degree of disorder in amorphous solids.