Manjunatha S O

• Ph.D in Physics
• Professor (Assistant) at BMS College of Engineering

Nanoscale Nickel ferrite particles were prepared by combustion method using nickel nitrate as oxidizer and urea as a fuel. The structure of the sample is studied with X-ray diffraction (XRD) using Cu-Kα radiation. The X-ray diffraction analysis revealed the nanocrystalline nature in the prepared ferrite samples. Dielectric studies have been underta...

Herein, we propose the synthesis of reduced graphene oxide (rGO) (0, 1.5, 2.5 and 3.5 wt%) doped Copper-Zinc (Cu-Zn) ferrite composites via simple solution combustion technique. The synergetic effects of rGO doping into Cu-Zn ferrite composites were examined through different analytical and spectroscopic characterization techniques such as scanning...

The novel rare earth (Lu) doped zinc ferrite nanoparticles, synthesized via a solution combustion approach, exhibit exceptional sensitivity to carbon monoxide (C.O.), a capability studied for the first time. The successful detection of C.O. by these nanoparticles underscores their potential as efficient gas sensors. Structural and morphological cha...

Recently, there has been an increased focus on investigating the possible use of ferrite nanoparticles as magnetic memory devices. In this study, we report on the structural, microstructural, Raman, density functional theory and magnetic characteristics of Mg1-xLixFe2O4 (x = 0, 0.15, 0.3, 0.45, 0.5 and 0.75). Samples were synthesized by solution co...

Humidity sensing properties of NiFe2O4/CoCr2O4 nanocomposites ceramics were reported for the first time through chemical synthesis and mechanical mixing methods. The interaction of CoCr2O4 and NiFe2O4 was analyzed through X-ray diffraction, and the morphology of the samples was studied with Field emission scanning electron microscopy(FESEM). The re...

In recent years, cobalt chromites/nickel ferrites have been attractive candidates for significant applications as nanomagnets. In the present work, structural, electronic, vibrational and low-temperature magnetic properties of NiFe2O4, CoCr2O4, and NiFe2O4/CoCr2O4 nanocomposites were investigated. Refined XRD patterns and the Raman spectra confirm...

Herein we report the effect of samarium (rare earth metal) doping on the morphological, structural, optical, magnetic, dielectric, and electrical properties of copper–iron oxide ferrite composites [CuFe2−xSmxO4 (x = 0, 0.05, 0.075, and 0.1)] (abbreviated as SCFO). The CuFe2−xSmxO4-based ferrites were synthesized by the solution combustion technique...

For the first time, innovative and remarkable humidity sensing properties of solvent combustion produced spinel cobalt chromite nanoparticles based microporous materials have been presented. These features were identified by solution combustion. To create a capacitive humidity sensor, microporous samples were initially created by sintering a green...

In this present research work, humidity sensing performance of transition metal dichalcogenide, tantalum disulfide (TaS2) was studied. TaS2 was characterized by XRD and SEM techniques. For the humidity sensing studies, TaS2 in the pellet form was subjected to humidity sensing studies. Sensing performance of the 2D material TaS2 was found to be 88%...

Various carbon -based MgAl2O4 (MAO) adsorbents were synthesized by a simple ultrasound irradiation technology with the activated carbon (AC), carbon quantum dots (CQDs), C3N4 (CN) and graphene oxide (GO) as carbon sources. The optimum synthesis conditions for the carbon -based MAO adsorbents were determined by the study of the addition of different...

Increased fossil fuel consumption in today's high-tech society has led to a rise in atmospheric concentrations of greenhouse gases that must be a mitigated. To get there, we need sensors that can report on atmospheric concentrations of greenhouse gases. Rare earths are used in the renewable energy technologies such as greenhouse gases, wind turbine...

Herein, we report the synthesis of novel nickel ferrite doped with yttrium nanocomposite (NiFe2−xYxO4 represented as NFY) thin film with multifunctional features such as mechanical robustness and strain sensing properties for EMI shielding applications in broadband microwave frequencies. The thin films of NiFe2−xYxO4 were characterized by scanning...

Ferrites are a very common commodity in the modern world due to their very strong magnetic permeability, high resistivity, modest permittivity, high saturation magnetization, low power losses, low coercivity, low remanence magnetization, and low power losses. These properties are mainly depending on chemical composition, synthesis method, and other...

The current study examines the structural, surface morphology, electrical, optical, and magnetic properties of [Co(1-x)Scx][Cr2][O4] (x = 0, 0.01, 0.03, 0.05, 0.07) prepared by combustion method. XRD (X-ray diffraction) and Raman spectra were utilized to confirm phase and structural. SEM (scanning electron microscopy) micrographs were utilized for...

The fast development in the compact and wearable opto-electronics devices need a high-performance electromagnetic (EM) shielding materials that are shows a unique feature like lightweight and flexible in characteristics that increase the problems of electromagnetic pollution. At present technological aspects, the absorption predominant microwave sh...

Rare earth-doped ferrites are exhibiting remarkable surface phenomena. Wherein the process of adsorption is most significant. Humidity sensors are the realization of an adsorption mechanism. Therefore, rare earth-doped ferrites are suitable for humidity sensor applications. Considering this fact, in the present work, Holmium(Ho3+) Mn-Bi ferrites ar...

Here, theoretical and practical methods were used to study the impact of Eu³⁺ substitution on copper ferrites. The spinel cubic structure of the synthesised samples is crystalline, and XRD analysis revealed the presence of a trace amount of the impurity Fe2O3 phase. The range of the estimated crystallite sizes is between 18 and 27 nm. FTIR spectra...

In the present work, Co(1-x)BixCr2O4 (where x = 0.00, 0.05, and 0.10) nanoparticles were investigated in detail by combining theoretical and experimental efforts. The Co(1-x)BixCr2O4 (where x = 0.00, 0.05, and 0.10) nanoparticles were synthesized via a solution combustion method and studied through structural, microstructural, electrical, and magne...

Supporting Information: Towards shape-oriented Bi-doped CoCr 2 O 4 nanoparticles from theoretical and experimental perspective: Structural, Morphological, Optical, Electrical and Magnetic properties

Nanoparticles of Mn0.5Zn0.5Fe2O4, Mn0.5Zn0.5Fe1.95Sm0.05O4 and Mn0.5Zn0.5Fe1.9Gd0.05Sm0.05O4 ferrites are prepared by solution combustion method and characterized to comprehend their structural, microstructural and magnetic properties. The single-phase formation and spinel cubic structure of the samples analyzed by XRD method. The average crystalli...

The CuFe(2-x)EuxO4 (where x = 0.00, 0.01, 0.02, 0.03) nanoparticles are synthesized by solution combustion method. The influence of Eu3+ on the structural, morphological, dielectrical, and humidity sensing study is recorded. The XRD pat tern peaks of the as-prepared CuFe(2-x)EuxO4 (where x = 0.00, 0.01, 0.02, 0.03) nanoparticle confirm the polycrys...

A systematic study on the thermal conductivity, Seebeck coefficient and specific heat of La0.7Ca0.2Sr0.1MnO3:PdO composites is presented. Solid state reaction procedure was employed to synthesis the samples. It is seen from thermal conductivity (κ(T)) studies that the samples exhibit a slope change nature close to their corresponding magnetic phase...

In the present communication the results on thermal conductivity, Seebeck coefficient and specific heat of Pr2/3Sr1/3MnO3:PdO composites are reported. All the samples exhibit a pronounced anomaly in thermal conductivity (κ) at their respective Curie temperatures, TC of the samples. It is also observed that the overall magnitude of κ decreases with...

In the present communication, we report the effect of Bi substitution on structural, magneto-transport, magnetic and thermal properties of La0.65-xBixCa0.35MnO3 (0 ≤ x ≤ 0.2) compounds. Rietveld refined XRD patterns confirm that all the samples are single phase and crystallize in rhombohedral symmetry with R−3C space group. It was observed from ele...

In this communication, we present some results on thermo‐electric properties of various high temperature superconductors. We have performed measurements on three rare‐earth based cuprate superconductors. All the superconductors were prepared using solid state reaction method. The XRD studies on the present samples indicate that all the samples are...