Ashok Lamani

Kuvempu University · Department of Physics

Achieving strong optical nonlinearities in vitreous nanocomposites is imperative for the advancement of futuristic telecommunication and photonic technologies. In this regard the borate materials (vitreous) are deemed to be important and currently available commercial hosts. In the current work, we demonstrate the tuning of the nonlinear optical (N...

In recent days the green approach of preparing reduced graphene oxide using plant extracts has attracted more attention among the research fraternity over the orthodox way of using chemicals. The green approach carries advantages like low cost and environmentally friendly nature. Here in this study, the reduction of graphene oxide is carried out us...

The effect of graphite particle size on oxidation of graphene oxide prepared by Modified Hummer’s method has been investigated. The oxidation was performed on three different sized graphite particles 20µm, 100µm and 250µm. The samples were characterized by means of X-ray diffraction, FTIR. The CV studies for the different sized particles has been p...

Synthesis of metal oxide nanoparticles using bio-fuels is a promising option to conventional physical and chemical methods. Here a simple and economic combustion method was followed to synthesis ZnO nanoparticles (NP’s) using hog plum extract as a fuel. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution tr...

Zinc oxide nanoparticles (NP’s) have been synthesized using cashew apple extract. The synthesized ZnO NP’s were characterized structurally, optically and morphologically by using X-ray diffraction spectroscopy, UV–Visible absorption spectroscopy, photoluminescence (PL) spectroscopy, field emission scanning electron microscopy (FESEM), energy disper...

In the recent work effects of ϒ-irradiation (100 kGy) subject area on the conductivity and dielectric properties of PVA/NaAlg/LiClO 4 (45; 45; 10 weight%) films have been investigated. Polymer complex films were made individually by using solution casting and the changes in the individuals can be distinguished of films induced by ϒ-irradiation (100...

Current subject area deals with the Conductivity of AC and Dielectric examines of the polymer films of perfect polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), PVA/CMC and lithium perchlorate doped PVA/CMC (10:45:45 weight%). The composite picture shows were developed utilizing solution casting technique. The prepared films were characterize...

NPs of Ce1-xZnxO2 (x=0, 0.02, 0.040.06, 0.08) were prepared by solution combustion technique using glycine as fuel. The prepared sample were subjected to various characterization techniques includes UV-visible spectrometer, X-ray diffractometer (XRD), Scanning electron microscope (SEM) and Energy dispersive X-Ray analysis (EDX). The X-ray diffracti...

High sensitive materials are always in demand for usage in smart devices. To achieve this nanomaterials becomes a back bone from last decade. In this sense we synthesized Zn doped TiO2 (2-10 at. Wt %) nanoparticles from one step peptization method with particle size vary between 27nm – 57.5nm confirmed by Scherrer formula. Tetragonal rutile structu...

In the present study we have investigated the effect of salt (LiClO4) and CMC and NaAlg biopolymer addition on dielectric and AC conductivity properties PVA film. The 45:45 wt% (PVA/CMC) and (PVA/NaAlg) blends and doped with 10 wt% concentrations of LiClO4 composite films were prepared separately by solution casting and then they were subjected to...

The titanium oxide (TiO2) has been prepared by peptization method and Polyaniline/Tin oxide (PANI/TiO2) nanocomposites have been successfully synthesized by in-situ polymerization method. The PANI/TiO2 nanocomposites were prepared by varying the weight percentage of TiO2 nanoparticles such as 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% into the fixed...

Chromium doped ceria nanoparticles have been synthesized by using a novel solution combustion method with chromium nitrate hexahydrate as oxidizers and glycine as a fuel. The main objective of the present study is to find the effect of chromium on structural, optical, dielectric properties and ac- conductivity of cerium oxide nanoparticles (CeO2 NP...

Nano Phase Nickel-Zinc ferrite (Ni0.6Zn0.4GdyFe2-yO4) substituted with Gd+3 (y=0, 0.1, 0.15, and 0.2) is synthesized under low temperature via citrate-gel combustion method. The Structural studies were carried out by PXRD and found to be lattice constant, and crystallite size decreased upon Gd+3 (x=0.1) ion substitution and slightly increases at hi...

NPs of Ce1-xCrxO2 (x=0, 0.04, 0.08, 0.12) have been synthesized by solution combustion method using glycine as fuel. The effect of chromium on structural and dc electrical conductivity of cerium oxide nanoparticles were investigated. The obtained powder is characterized by UV-visible spectrometer, X-ray diffractometer (XRD), Scanning electron micro...

Here we have reported the dielectric properties of porous structured Cerium oxide nanoparticles (CeO2 NPs) as a function of frequency at different temperature (RT-200 °C). CeO2 NPs were synthesized by using solution combustion method with cerium nitrate hexa hydrate (oxidizer) and glycine (fuel) as raw materials. From X-ray diffraction pattern it i...

In this work, the optical and dielectric properties of Co doped SnO2 nanoparticles were studied using a.c. impedance spectroscopy. X-ray diffraction (XRD) confirmed that the Co doped SnO2 powder samples have the same tetragonal structure as pure SnO2 nanoparticles. The structural, surface morphological studies, compositional analyses and optical en...

Tin oxide nanomaterials have been synthesized using gel combustion method by varying the oxidizer (conc. HNO3) and keeping fuel (C6H8O7) as a constant. The prepared samples were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Analysis X-ray Spectroscopy (EDAX) and UV-visible spectroscopy. In this w...

ZnO nanoparticles of different size were prepared by varying the molar ratio of glycine and zinc nitrate hexahydrate as fuel and oxidizer (F/O = 0.8, 1.11, 1.7) by simple solution combustion method. Powder samples were characterized by UV-Visible spectrophotometer, X-ray diffractometer and scanning electron microscope. Ethanol sensing studies for 1...

The Ce1-xZnxO2 (x = 0, 0.02, 0.04, 0.06, 0.08) nanoparticles (NPs) were synthesized by solution combustion method using glycine as a fuel. The obtained NPs were characterized by different physicochemical techniques such as UV-Visible spectrophotometer, X-ray diffraction (XRD), fourier transform infrared (FT-IR) spectroscopy, scanning electron micro...

Temperature dependence of dielectric constant and loss has been investigated for different compositions of Zinc substituted copper ferrites with general formula Cu 1–x Zn x Fe2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) prepared by ceramic method. XRD analysis confirms all the samples exhibit single phase cubic spinel structure. The dielectric constant...

Conducting polyaniline/titanium dioxide (PANI/TiO2) composites have been succesfully synthesized by insitu polymerization technique. The PANI/TiO2 nanocomposites of different compositions were prepared by varying weight percentage of TiO2 nanoparticles such as 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% into the fixed amount of the aniline monomer. T...

Conducting polyaniline/tin oxide (PANI/SnO2) nanocomposites have been successfully synthesized by in-situ polymerization technique. The PANI/SnO2 nanocomposites of different compositions were prepared by varying weight percentage of SnO2 nanoparticles such as 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% into the fixed amount of the aniline monomer. Th...

In this work TiO2 nanomaterial of different particle size were synthesized by varying the pH of the solution by hydrolysis and peptization method. These samples were characterized by XRD, UV and SEM. The XRD reveals the formation of anatase phase form of TiO2 nanoparticles having the particle size in the range 15 nm to 35 nm. The calculated band ga...

Cerium oxide nanoparticles were synthesized by solution combustion method with varying the oxidizer (cerium nitrate hexa hydrate) to fuel (Glycine) molar ratio. The prepared samples were characterized by UV-visible spectrometer, X-ray diffractometer (XRD), Scanning electron microscope (SEM) and Energy dispersive X-Ray analysis (EDAX). XRD pattern r...

Materials reduced to the Nano scale can exhibit different properties compared to what they exhibit on a micro scale, enabling unique applications. When TiO2 is reduced to Nano scale it shows unique properties, of which the electrical aspect is highly important. This paper presents increase in the energy gap and decrease in conductivity with decreas...

Electrical conductivity of SnO 2 based oxide is of great importance for their applications as transparent conducting oxides (TCO) and gas sensors. Better understanding and control of its conductivity would enhance its performance in existing applications and enable new ones. Sn 1-x Co x O 2 nanoparticles were prepared by the gel combustion method....

Nanocrystalline Tin oxide (SnO 2) material of different crystallite size was synthesized using gel combustion method by varying the fuel (C 6 H 8 O 7) to oxidizer (HNO3) molar ratio as a process parameter. The effect of molar ratio of fuel to oxidizer on the particle size was investigated. The SnO 2 nanoparticles were prepared by varying the amount...

Variation of DC electrical conductivity with temperature from 273-473 K of electron beam irradiated Tetra-nitro zinc, and Cu-Pcs, were carried out. It shows semiconductor behavior and resistivity varies from 0.043×10 5 Ω-cm to 64.61×10 5 Ω-cm for all complexes. Variation of conductivity with temperature shows two straight lines of different slopes...

Conducting polymer/ferrite nanocomposites with an organized structure provide a new functional hybrid between organic and inorganic materials. The most popular among the conductive polymers is the polyaniline due to its wide application in different Eelds. In the present work nickel ferrite nanoparticles were prepared by sol–gel citrate-nitrate met...

ZnO nanoparticles of different size were prepared by varying the molar ratio of glycine and zinc nitrate hexahydrate as fuel and oxidizer (F/O = 0.8, 1.11, 1.7) by simple solution combustion method (SCM). Powder samples were characterized by UV-Visible spectrophotometer, X-ray diffractometer and Scanning electron microscope (SEM). Acetone sensing s...

Nanocrystalline Tin oxide material with different grain size was synthesized using gel combustion method by varying the fuel (C6H8O7) to oxidizer (HNO3) molar ratio by keeping the amount of fuel as constant. The prepared samples were characterized by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive Analysis X-...

ZnO nanoparticles of different size were prepared by varying the molar ratio of glycine and zinc nitrate hexahydrate as fuel and oxidizer (F/O = 0.8, 1.11, 1.7) by simple solution combustion method. Powder samples were characterized by UV-Visible spectrophotometer, X-ray diffractometer, Scanning electron microscope (SEM). DC electrical conductivity...

In the present study spin-glass-like ordering has been observed in the spinel Co-Zn ferrite. DC magnetizations display divergence at low temperature, which indicates a frozen state with the freezing temperature of Tf=180 K. Frequency dependence of AC susceptibility measurement was performed on series of above sample. It shows a peak at around Tf,...

Nanocrystalline Tin oxide (SnO2) material with different crystallite size was synthesized using gel combustion method by varying the fuel (C6H8O7) to oxidizer (HNO3) molar ratio as a process parameter. The effect of the molar ratio of fuel to oxidizer in the gel combustion method was investigated by inspecting the crystallite size of nano SnO2 powd...

ZnO nanoparticles of different size were prepared by varying the molar ratio of glycine and zinc nitrate hexahydrate as fuel and oxidizer (F/O molar ratio = 0.8, 1.11, 1.7) by simple solution combustion method. Powder samples were characterized by UV-Visible spectrophotometer, X-ray diffractometer (XRD), Scanning electron microscope (SEM). LPG sens...

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The Cu 1–x Zn xFe2O4 (x = 0, 0·2, 0·4, 0·6, 0·8, 1.0) samples were prepared using double sintering ceramic method by adding Zn 2+ at different concentration. The X-ray line profile analysis were carried out to confirm the spinel phase formation as well as to know the (%) strain in the crystal. The real and imaginary part of a.c. susceptibility mea...

The dielectric permittivity, loss tangent, in the frequency range 1MHz to 1.8 GHz and hysteresis loop parameters at room temperature were studied on a series of Zn substituted cobalt ferrites with general formulaCo 1-x Zn x Fe 2 O 4 where (x=0.0, 0.2, 0.4, 0.6, 1.0.). The experimental results indicate that the Zn substitution affects all these para...

Conducting polyaniline/ZnFe2O4 nanocomposites are synthesized by using a simple and inexpensive one-step in-situ polymerization method in the presence of ZnFe2O4 nanoparticles. The structural, morphological and electrical properties of the samples are characterized by x-ray diffraction, Fourier transform infrared spectra and scanning electron micro...

A series of samples of the system Co 12x Zn x Fe 2 O 4 (for x50?0, 0?2, 0?4, 0?6 and 1?0) were prepared by usual ceramic technique. These prepared samples were examined using X-ray powder pattern, which confirms the presence of a spinel structure. The authors have also carried out line profile analysis of individual Bragg reflections observed in th...

Cu-Zn ferrites are synthesized by double sintering ceramic method. X-ray analysis of Cu-Zn ferrite shows the single phase spinel structure. The structural and microstructural parameters have been computed using X-ray diffraction data. Using CheckCell program, the Bragg reflections have been indexed. The estimated microstructural parameters have bee...