limbraj Ravangave - Academia.edu (original) (raw)

Papers by limbraj Ravangave

International Journal for Research in Applied Science and Engineering Technology

: Ni0.4Cu0.3Zn0.3Gd0.125Fe1.875O4 spinel ferrite powder is successfully synthesized using sol-gel... more : Ni0.4Cu0.3Zn0.3Gd0.125Fe1.875O4 spinel ferrite powder is successfully synthesized using sol-gel auto combustion technique. The structural, optical and magnetic properties investigated by using X-ray Diffractometer, FTIR Spectrometer, Scanning Electron Microscope and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed that formation of Nano crystalline cubic spinel structure of the sample. The crystallite size of synthesized nanoparticles is about 29.45nm. The IR study support the confirmation spinel structure of Ni0.4Cu0.3Zn0.3Gd0.125Fe1.875O4 sample. Band gap energy Eg obtained using UV-Visible absorption data is about 2.4238 eV. The magnetic properties have been studied from VSM data shows that

Materials Today: Proceedings, 2021

Previously ZnO nanostructures production such as Hydrothermal, Cooperation and Anodization were d... more Previously ZnO nanostructures production such as Hydrothermal, Cooperation and Anodization were described. In this paper FTIR, XRD, scanning electron microscope processes are used for determining various characteristics of ZnO particles. It shows morphological changes of ZnO particles. We have presented the study of ZnO nanoparticles properties by using UV-Visible spectrophotometer, photoluminescence spectroscopy devices. It determines the properties of ZnO nanoparticles. We have described the effect of temperature reaction on chemically synthesized ZnO Nano particles based on change in Particle size.

International Journal of Advances in Applied Sciences, 2021

Zinc Oxide (ZnO) thin films were deposited for five different molarity (M) of Zinc acetate hydrat... more Zinc Oxide (ZnO) thin films were deposited for five different molarity (M) of Zinc acetate hydrated (0.075, 0.1, 0.125, 0.15, 0.175 M) using simple spray technique to study the effect of zinc ion concentration on structure, morphology and optical properties. The XRD patterns of deposited ZnO thin films show hexagonal crystal structure with wurtzite symmetry. The effect of molarity on morphology was studied using scanning electron microscopy (SEM). The elemental analysis was studied by using energy dispersive X-ray analysis (EDX). The optical absorption was recorded by using systronics double beam spectrophotometer (2201). Crystallite size estimated from XRD data was in nanometre (nm) range; however, films deposited for 0.15 M zinc acetate show maximum crystallite size (66 nm) as compared to other samples. All the films show low absorption in wide range (340-999 nm) of electromagnetic spectrum. However, ZnO film deposited for 0.15 zinc acetate hydrated shows maximum blue shifting of ...

The Ca1-xF2+x: Eux particles were synthesized by simple chemical co-precipitation method in an et... more The Ca1-xF2+x: Eux particles were synthesized by simple chemical co-precipitation method in an ethanol solution. The Prepared CaF2: Eu nanoparticles were characterized using X ray diffractometer (XRD) and transmission electron microscopy (TEM). The intensity of XRD peaks decreased and full width at half maximum (FWHM) increased gradually with increasing the doping concentration of Eu ions. The XRD analysis reveals the cubic structure of Eu doped CaF2 Crystals. The particle size calculated from XRD data was decreased with increasing concentration of dopent ion and the average particle size was in the range of 63 to 26 nm. The transmission electron microscopy (TEM) shows nearly spherical morphology of CaF2: Eu nanoparticles.

The present study describes light induced fluorescence (LIF) spectroscopy for detection and diagn... more The present study describes light induced fluorescence (LIF) spectroscopy for detection and diagnosis of cancerous tissues of female human breast. The fluorescence spectra are recorded for four different samples of cancerous and corresponding normal tissues. The fluorescence emitted by the fluorophore in the tissues were detected and analyzed. Breast cancerous cells exhibit specific changes in the emitted fluorescence spectra as compared with the normal breast cells. The statistical variation of fluorescence intensity ratio, may be used to distinguish the samples. It is concluded that light induced fluorescence spectroscopy is useful for detection and diagnosis for the female human breast tumor.

In this work we prepared cadmium zinc sulphide (CdxZn1-xS) thin films on glass substrate using sp... more In this work we prepared cadmium zinc sulphide (CdxZn1-xS) thin films on glass substrate using spray pyrolysis chemical deposition technique. The effect of Cd composition on structural and optical was studied. The XRD pattern of CdxZn1-xS films shows hexagonal wartzite symmetry of CdZnS material. The XRD data confirmed that the crystallites were increased with composition of Cd 2+ content. The intensity of (002) peak is increased for x= 0.6 and 0.8. The variation of grain size with composition was investigated from XRD data. The optical energy band gap obtained from data of the absorption spectra confirmed that the band gap is increased with Zn content in CdxZn1-xS thin films. The transmittance spectra reaveled the % transmittance was increased with increase of Zn content in CdxZn1-xS thin films.

SN Applied Sciences, 2020

Monophasic nanocrystals of rare earth gadolinium (Gd 3+) ion doped nickel-cobalt ferrite, Ni 0.5 ... more Monophasic nanocrystals of rare earth gadolinium (Gd 3+) ion doped nickel-cobalt ferrite, Ni 0.5 Co 0.5 Gd y Fe 2−y O 4 (y = 0.00, 0.025, 0.050, 0.075, 0.100 and 0.125) have been synthesized by l-ascorbic acid assisted sol-gel auto-ignition process. Thermogravimetric and differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) with selected area electron diffraction (SAED) patterns, ultraviolet-visible spectrophotometry and vibrating sample magnetometer were employed to characterize the microstructure, optical and magnetic properties. Structural investigations verified the presence of cubic spinel phase short of any contamination peak. The average crystallite size was seen in nano-regime dimensions and well confirmed by TEM results. SAED patterns showed bright and intense ring of (311) plane revealed the establishment of spinel ferrite nanocrystals. Lattice constant (a) increases steadily with the rise in Gd 3+ content following the Vegard's law. FTIR spectra confirmed the creation of spinel ferrite structural geometry. Saturation magnetization (M s) and a remanence magnetization (M r) decreased from 29.77 to 20.78 emu/g and 21.62 to 15.79 emu/g, respectively, with increasing the Gd 3+ content. However, coercivity (H c) is significantly increased. The highest value of H c = 1132 Oe was found for y = 0.075 sample. The reduction in M s values can be justified owing to the replacement of Fe 3+ existing at the octahedral [B]-sites by the Gd 3+ ions which is paramagnetic at room temperature. The elucidation of magnetic parameters with Gd 3+ doping was attributed to the discrepancy of anisotropy constant, the paramagnetic nature of Gd 3+ and crystallite size effect.

Advances in Glass Science and Technology, Jun 6, 2018

A series of stable and transparent glasses with the composition 59B 2 O 3-10Na 2 O-(30 − x) CdO-x... more A series of stable and transparent glasses with the composition 59B 2 O 3-10Na 2 O-(30 − x) CdO-xZnO-1CuO (0 ≤ x ≤ 30) (where x = 0, 7.5, 15, 22.5, and 30 mol%) were prepared by conventional melt-quenching technique. These glasses were characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Raman spectroscopes, differential scanning calorimetry (DSC), optical absorption, and electron paramagnetic resonance (EPR). XRD and DSC analysis confirmed the glassy nature of the prepared samples. The physical properties such as density (ρ), molar volume (V m), oxygen packing density (OPD), and the molar volume of oxygen (V o) were calculated and discussed. FTIR and Raman studies showed that the glass network consists of BO 3 and BO 4 units in various borate groups. From DSC, it was found that the glass transition temperature (T g) varies nonlinearly with the addition of ZnO content in place of CdO. Both EPR and optical absorption results have confirmed that the Cu 2+ ions are in octahedral coordination with a strong tetrahedral distortion. The changes in various spectroscopic properties of Cu 2+ ions in the glasses such as spin-Hamiltonian parameters () and bonding coefficients (α 2 , β 1 2 , and β 2) were understood with the help of FTIR and Raman studies.

JOURNAL OF ADVANCES IN PHYSICS, 2017

Glasses with compositions 59B2O3-10K2O-(30-x)ZnO-xBaO-1CuO were prepared using melt quenching tec... more Glasses with compositions 59B2O3-10K2O-(30-x)ZnO-xBaO-1CuO were prepared using melt quenching technique. The effect of BaO content in present glass system doped with copper ion in place of ZnO has been studied with respect to structural properties. Raman spectroscopy is an experimental technique appropriate for providing information about Â the structure, local arrangement of the atoms in the present glasses. The Raman spectra of glasses were recorded at room temperature in the range 200-1800 cm-1 using a He-Ne excitation source having wavelength 632.81 nm. The Raman peaks appeared around 760 cm-1 assigned symmetric breathing vibrations of six-membered ring with both BO3 triangle and BO4 tetrahedral. The intensity of these peaks is slightly varied with the addition of BaO content while the broadness is found to be larger at 30 mol% of BaO than 30 mol% ZnO. This indicates that certain BO4 units could be preferentially converted while those in ring groups could be stabilized. Raman st...

IOSR Journal of Applied Physics, 2017

In this particular experiment we employ Chemical Bath deposition Technique. Initially the bath pa... more In this particular experiment we employ Chemical Bath deposition Technique. Initially the bath parameters such as temperature, pH of the precursors, molarity of the solutions, deposition time were optimized for synthesis of CdS thin films. Using above optimized parameters, we prepare Cd 1-x Zn x S thin films for the study of effect of Zn concentration on various properties of the films. The structural, Morphological and optical characterization were investigated. The XRD spectra of the Cd 1-x Zn x S films exhibit the hexagonal crystal structure with preferential orientations at (100), (002), (101), (203), (102), (110), (200) and (004) planes. The planes (101), (002), (100) exhibited the wurtzite (hexagonal type) structure. XRD pattern shows increase in half width at full maximum with Zn content. SEM micrograph shows the porous fibrous network consisting of regularly arranged matrix over which regular shaped fine particles systematically distributed. The effect of Zn concentration in Cd 1-x Zn x S thin films clearly understood from the improvement in the microstructure of the surface morphology. The optical spectra show that absorption was found decreased with Zn content of the Cd 1x Zn x S.The absorption spectra shows the significant blue shifting of absorption edge (approximately from 450-325 nm). The optical transmittance was found maximum in the visible region (450-800 nm) and increased on increasing the Zn concentration. The x=0.2 composition having maximum transmittance 78% show the maximum 3.9 eV optical band gap which may be high enough for solar cell applications.

Journal of Non-Crystalline Solids, 2016

Abstract X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infr... more Abstract X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), electron paramagnetic resonance (EPR) and optical absorption studies on 59B 2 O 3 –10K 2 O–(30-x)ZnO–xBaO–1CuO glasses (where x = 0, 6, 12, 18, 24 and 30 mol%) have been carried out. The amorphous nature of the glasses was confirmed using XRD and DSC measurements. The glass transition temperature (T g ) of glass samples has been estimated from DSC traces and found that the T g increases with increasing BaO content. The IR studies have showed that the present glass system consists of [BO 3 ] and [BO 4 ] units in various borate groups. The spin-Hamiltonian parameters (SHP) such as g || , g ⊥ , and A || have been determined from EPR spectra and it was found that the Cu 2 + ion is in tetragonal distorted octahedral site with d x 2 ‐y 2 as the ground state. Bonding parameters and bonding symmetry of Cu 2 + ions have been calculated by correlating EPR and optical data and were found to be composition dependent.

Journal of Materials Chemistry A, 2013

Group 6 transition metal dichalcogenides (TMD) such as MoS2 are promising candidates for 2 photoc... more Group 6 transition metal dichalcogenides (TMD) such as MoS2 are promising candidates for 2 photocatalysis and photoelectrochemical applications. Despite their promise, scalability 3 remains a challenge for TMD-based photoanodes. Here we investigate the 4 photoelectrochemical properties of ultra-thin films of chemically exfoliated MoS2 and its 5 composites with TiO2 nanoparticles. We show that MoS2 monolayer films exhibit 6 photoelectrochemical properties similar to bulk materials, generating photocurrent at 7 excitation wavelengths above the direct band gap edge at ~ 660 nm (~1.9 eV). We also 8 demonstrate that MoS2 monolayers sensitized to TiO2 behave as effective photosensitizers. We 9 find that in TiO2-MoS2 composite photoanodes, photoexcited electrons in MoS2 are able inject 10 into TiO2 whilst holes are removed by the electrolyte so as to generate electrical current from 11 incident light. Our results demonstrate the potential of solution-processed MoS2 monolayers 12 for photoelectrochemical applications.

Global Journal For Research Analysis, 2012

The Chemical Bath Deposition Method (CBD) was employed for deposition of Cd 1-x Zn x S (x = 0.0, ... more The Chemical Bath Deposition Method (CBD) was employed for deposition of Cd 1-x Zn x S (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) thin films. The chemically deposited Cd 1-x Zn x S thin films were characterized by using UV-Visible spectrophotometer. Transmission spectra show the blue shifting of absorption edge as the Zn content increased. The x = 0.8 composition shows maximum 78 % transmittance. The reflection in the blue portion of the incident spectrum was decreased as the Zn content increased. The (αhν) 2 versus photon energy (hν) curves shows tuning of band gap with Zn content. The observed band gap was 3.9 eV in the x = 0.8 composition. The effect of composition on refractive index, absorption index and other optical dispersion parameters were also investigated. The calculated values of average excitation energy E o approximately obey the empirical relation (E o =1.2 E g) obtained from single oscillator model.

Optics and Photonics Letters, 2013

thin films were deposited using the Chemical Bath Deposition Method (CBD). The prepared Cd 1Àx Zn... more thin films were deposited using the Chemical Bath Deposition Method (CBD). The prepared Cd 1Àx Zn x S thin films were optically characterized. The effect of Zn content on absorption and transmission spectra was investigated. The significant blue shift of absorption edge as well as tuning of band gap was observed with Zn content. In the composition x ¼ 0:8 Cd 1Àx Zn x S thin films exhibit maximum 78% transmittance. The SEM study confirms that even though Zn content was low the microstructure of Cd 1Àx Zn x S thin films effectively changes.

Background: Zinc Oxide (ZnO) thin film was deposited using simple low cost spray pyrolysis techni... more Background: Zinc Oxide (ZnO) thin film was deposited using simple low cost spray pyrolysis technique. The deposited film was characterized by X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and UV-Visible spectroscopy. XRD Spectra revealed that ZnO film represents polycrystalline wurzite crystal structure. Full Width at Half Maximum (FWHM) was estimated using Lorentz Fit of XRD data. The crystallite size calculated was to be 26.31 nm. The SEM image of ZnO thin film shows whole surface was uniformly coated with spherical ZnO grains of average size 111.55 nm. Purity of the deposited sample was investigated by using Energy Dispersive X-ray Analysis (EDX). The deposited ZnO film shows 78% transmittance. The optical band gap estimated by Tauc plot was 3.76eV. Address for Correspondence: Dr Sarika Jadhav, Department Of Physics Sant Tukaram College Of Arts And Science, Parbhani, INDIA. Email:sarika.jadhav125@gmail.com Received Date: 10/08/2021 Revised Date: 29/09/2021 Accept...

In present article ZnO thin films were deposited for five different substrate temperatures (150-3... more In present article ZnO thin films were deposited for five different substrate temperatures (150-350 o C) using simple spray technique. The deposited films have been characterized using X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and UV-Visible spectroscopy and effect of substrate temperature on structure, morphology, and optical properties have been studied. Crystallite size was estimated from using Lorentz Fit of XRD data. The crystallite size was in the 20 to 26.32 nm range. The SEM of (ZnO 300 ) film sample shows whole surface was uniformly coated with schematically arranged network of ZnO wires of average diameter 566 nm. Purity of the deposited sample was investigated by using Energ Dispersive X-ray Analysis (EDX). All the ZnO films exhibit 70 to 80% transmittance and 3.23 to 3.26 eV optical band gap.

Cu 2 ZnSnS 4 (CZTS) films for different substrate temperatures were deposited by using simple che... more Cu 2 ZnSnS 4 (CZTS) films for different substrate temperatures were deposited by using simple chemical spray technique. Analytical reagent Grade; Copper chloride (CuCl 2 ), Zinc chloride (ZnCl 2 ), Tin chloride (SnCl 4 .5H 2 O) and thiourea (SC(NH 2 ) 2 ) were used as Cu + , Zn + , and Sn + and ion sources respectively. A set of five CZTS films was deposited using five different substrate temperatures (175, 200, 250, 275, and 300 ). The structure, Morphology, Elemental analysis and optical properties of these films were studied using X-ray diffratometer (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDX) and UV-Visible spectroscopy techniques respectively. The XRD spectra showed that all films are polycrystalline and exhibit kesterite tetragonal crystal structure with preferential orientation along (112) direction. The crstallinity was found increased with substrate temperature. The calculated crystallite size was increased with increase in substra...

Cu2ZnSnS4 (CZTS) films of different Thiorea (SC (NH2)2) molarity were deposited by using simple c... more Cu2ZnSnS4 (CZTS) films of different Thiorea (SC (NH2)2) molarity were deposited by using simple chemical spray technique at substrate temperature 275°C. Analytical reagent Grade Copper chloride (CuCl2), Zinc chloride (ZnCl2), Tin chloride (SnCl4.5H2O) were used as Cu+ , Zn+ , and Sn+ ion sources respectively and thiourea (SC(NH2)2) (0.02, 0.04 0.06 0.08, and 0.1 M) was used as a Sion source. A set of five CZTS films was deposited using five different molarity of thiourea. The structure, Morphology, Elemental analysis and optical properties of these films were studied using X-ray diffratometer (XRD), Scanning Electron Microscopy (SEM) Energy Dispersive X-ray Analysis (EDX) and UV-Visible spectroscopy techniques respectively. The XRD spectra showed that all films are polycrystalline tetragonal structure with preferential orientation along (112) plane. The calculated crystallite size was increased with increase in thiourea concentration. Variations of optical band gap with thiourea mol...

International Journal of Advances in Applied Sciences (IJAAS), 2021