Ranjana Jha

Netaji Subhas Institute of Technology | NSITONLINE · Department of Physics

ZnS and ZnO are both wide band gap semiconductors. Their nanocomposites have high potential for photocatalytic activity and useful for different applications. In the present investigation, an effort has been made to synthesize ZnS/ZnO nanocomposites by inducing microwave treatment before hydrothermal process to increase the reaction rate of ZnS/ZnO...

NiO thin films have been fabricated in two-step process synthesis of NiO nanoparticles using hydrothermal method and fabrication of NiO thin film on fluorine-doped tin oxide substrate via spin-coating technique. Changing the molarities of precursor solution as 0.1 M, 0.2 M, 0.3 M, in synthesizing NiO nanoparticles affects the morphological, structu...

Solution-processed, NiO thin films have been synthesized via spin coating technique. Nickel nitrate hexahydrate and 2-Aminoethanol have been used as nickel precursor and oxidizing agent, respectively for depositing layers of NiO solution on the FTO substrate. Investigating the effect of NiO layers on morphological, structural, electrochromic proper...

In this study, ZTC single crystals are grown using slow evaporation solution method. Dimensions of titled crystals are estimated to be 9.9 × 0.7 × 1.0, 8.5 × 0.7 × 1.0 and 10.0 × 0.8 × 1.0 mm³. XRD powder analysis identifies orthorhombic lattice with Pnma non-centrosymmetric space group. UV–Visible linear optical characterization confirms that the...

Research on catalytic materials has been a field of constant growth in the present decades, as it can be evidenced by huge number of research articles publishing each year. Thus far, many articles have been surveyed for Zinc sulphide (ZnS) as suitable photocatalyst. But ZnS nanomaterials can be utilized as both photocatalysts and electrocatalysts t...

The continuous consumption of non-renewable sources of energy causes several environmental problems such as greenhouse effect, global warming, pollution, etc. For development of clean and sustainable environment, our society urges an alternative of non-renewable source of energy such as fuel cell, solar cell, electrochemical capacitors, splitting c...

Here, we synthesized the pure ZnO and (Co 2 % and Mn x%) co-doped ZnO nanoparticles using co-precipitation method. The structural, optical, and morphological properties were optimized by varying concentration of Mn dopants. Using photoluminescence (PL) study, the chromaticity plots were incorporated in the study. Prepared samples have potential to...

Nickel oxide (NiO) nanoparticles (NPs) have been synthesized using a high-yield, efficient hydrothermal technique. Investigations have been done to study the effect of the alkaline environment provided by Urea and Potassium Sulphate on the structural, optical and electrochromic properties of NiO nanoparticles. Hydrolysis of Urea provides an alkalin...

Nano-crystals with exclusive morphologies and high stability, are of great importance due to their wide application in energy harvesting. We aimed here synthesis of pure α-MoO3 nanoparticles and their doped variants with Ag/Pt noble metals by following the hydrothermal procedure under the optimized experimental conditions. The morphological studies...

ZnS nanoparticles have been synthesized using facile thermal decomposition route by varying the concentration of sulphur source. Increase in sulphur concentration increases the crystallinity of the synthesized samples, confirmed by calculation of various structural parameters or lattice defects using XRD data and FESEM images. The crystal structure...

The closely stacked layer in molybdenum diselenide (MoSe2) and low rate of charge transfer limits its application in solar cell devices. Here, in-situ polymerization of aniline was carried out on MoSe2/r-GO nanocomposites to achieve an enhanced electronically conductive system with a homogenously dispersed phase for its active role as a counter ele...

P-type semiconductor NiO is a wide bandgap, cost-effective and promising material as a counter electrode in the DSSC (dye-sensitized solar cells). In a solar cell device, a counter electrode helps in allowing holes to pass through the electrolyte towards the load and blocking the electrons to pass through it. In the present work, a thin film of NiO...

Facile hydrothermal method had been used for the multiple phase synthesis of nickel sulphide. Mixed phase of Ni3S4 and Ni3S2 were identify by the HRXRD and its crystallite size is 34 nm. Electro-catalytic properties of the synthesized sample was examined by Cyclic stability, cyclic voltammetry and Electrochemical impedance spectroscopy in 1 M LiOH....

Facile Hydrothermal method is used for the synthesis of phase controlled β-NiS nanoparticles. Single phase formation of β-NiS nano-particles are identified through Rietveld refinement and their crystal structure is Rhombohedral. Average crystallite size of the β-NiS is 28 nm and energy band gap of β-NiS nanoparticle is found to be 3.25 eV. N2 adsor...

Ni7S6 has been synthesised using solvo-thermal route, ethylene diamine (C2H4(NH2)2) and ethylene glycol ((CH2OH)2) were used as solvent. Structural and morphological properties of the prepared sample were studied by X-ray diffractometer (XRD) and Field emission scanning electron microscope (FESEM).Crystallite size of the synthesised sample is 26 nm...

ZnO nanoparticles with serrated hexagonal morphology were synthesised via hydrothermal route. XRD plot affirms the ZnO nanoparticles are formed. FTIR was performed to study the various vibrational modes of the synthesised ZnO nanoparticles. UV–VIS spectra was recorded to calculate the energy band gap of ZnO nanoparticles. Electrochemical studies we...

Energy and ecological issues increase high stress on the growth of a sustainable energy system. Better electrocatalysts is an imperative way to achieve this goal. This manuscript highlights the electronic energy state and surface area engineering of ZnS in the nanoscale regime. These properties make ZnS, an appropriate electrocatalyst for various e...

In this study, mesoporous nickel disulphide (NiS2) nano-particles have been successfully prepared using hydrothermal method. Phase formation and functional groups were identified by the high-resolution X-ray diffractometer (HR-XRD) and Fourier transform infrared spectroscopy (FTIR), respectively. Energy band gap of prepared NiS2 nanoparticles has b...

In the present work, Mesoporous Rhombohedral β-NiS (Nickel Sulphide) was synthesized by a solvothermal route using thiourea as Sulphur source. Rietveld refinement confirms the single phase formation of Rhombohedral β-NiS. Reaction temperature affects the electro-catalytic, optical and morphology of the synthesized β-NiS nanoparticles. 1-D nano-rods...

Energy has become one of the major concerns of the twenty-first century because of the social progress and development in human standard of living. The requirement for energy is increasing constantly, even though conventional combustion-based energy will keep on playing a leading role in gathering our demands in near future. The impending scarcity,...

Facile hydrothermal route is used for the synthesis of β-NiS nano-particles under the influence of trisodium citrate and ammonia. Trisodium citrate anions act as shape modifier for controlling the growth of β-NiS nano-particles and ammonia acts as reducing agent,which eliminates the different phase of nickel sulphide such as, α-NiS, NiS2, Ni3S2, Ni...

In the present work, two different phases of nickel sulphide (β-NiS and NiS2) were successfully synthesized via facile hydrothermal route. The physical and chemical characterizations such as X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy confirms formation of β-NiS and NiS2. Mesopo...

In the present study, comparative analyses of corrosion inhibition property of few thiadiazole-derived bis-Schiff bases for mild steel in 1 M HCl were done. Various electrochemical experiments (electrochemical impedance spectroscopy and potentiodynamic polarization), as well as weight loss experiments, were employed to study the anticorrosion activ...

Owing to larger surface area and high porosity of 3-D hierarchical nanostructures, it developed the intensive research interests of material scientists. Mesoporous 3-D hierarchical ZnS nanostructures have been synthesised using Hydro/solvothermal route. Using different precursors and chemical compositions different morphologies (Raspberry-like,Nano...

Size and shape controlled crystalline α-MoO3 nanostructures were synthesized through modified hydrothermal method without using any capping agents. Variation of concentration of oxidizing agent (H2O2) governed the morphology of the resulted nanostructures. FESEM and TEM techniques confirmed the unique morphological pattern with uniform size distrib...

A facile and efficient co-precipitation method has been used to synthesize pure nickel oxide (NiO) nanoparticles. The synthesis of NiO has been conducted at two different pH values (11.00, 12.33) and in alkaline media of LiOH and NaOH, and the variations in structural, electrochemical, and optical properties have been analyzed. The particle sizes o...

Mesoporous β-NiS (nickel sulfide) has been synthesized by a hydrothermal route using thiourea as a sulfur source. FESEM and TEM images confirm the formation of one dimension (1-D) or three dimension (3-D) nanostructures. 1-D or 3-D nanostructures were formed by varying the concentration of thiourea. The growth mechanisms for formation of 1-D and 3-...

In recent years, much interest have been grabbed by materials with multi-purpose characteristics. As the performance of electrochemical energy device such as supercapacitors and photocatalytic activities depend strongly on the properties of materials. This study delineates the various parameters like morphology, energy bandgap, charge transfer resi...

Nanoparticles of titanium dioxide were prepared using the sol‐gel method without any impurity. Rietveld refinement of XRD data confirmed the anatase phase of synthesized nanoparticles with space group I41/amd (141). XRD pattern revealed the crystalline nature of synthesized nanopowder. The average crystallite size of synthesized nanoparticles was c...

In the interesting class of transition metal oxides, molybdenum oxides and its derivatives are exceptionally anticipated because of their particular optical and structural properties. At room temperature, molybdenum trioxide is a wide band gap semiconductor with enhanced exciton binding energy. In nature, MoO3 in three forms which are α, β and h-fo...

We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg 4 I 5 prepared by pulsed laser deposition. The RbAg 4 I 5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β -AgI and RbI as raw materials. The ion-conducting properties of RbAg 4 I 5 were studied by alter...

Rationale Continuously downscaling integrated circuit devices require fabrication of shallower p‐n junctions. Ion implantation approach at low energy is subjected to low beam current due to the Coulomb repulsion. To overcome this problem cluster ions can be used for implantation. In comparison with single ions, the cluster ions possess lower energy...

Spherical n-type ZnS nanoparticles have been synthesised by co-precipitation method for absorption of UV-Vis region of solar spectrum without adding any impurity. Rietveld refinement of XRD data confirms that it has Zinc Blende crystal structure with (space group-216). Electrochemical studies have been performed for the synthesised ZnS nanoparticle...

Tailoring of TiO2 nanostructures from surfactant free route and its DSSC Properties

A simple one step co-precipitation route was employed to synthesize the size controlled quantum dots (size ~ 3 nm) by maintaining the pH value at 6, without addition of capping agent. The effect of different annealing temperatures on the structural and optical properties of as synthesized sample have been explained. XRD analysis of sample showed th...

Zinc oxide nanoparticles were synthesized utilizing a green and simple sonochemical route. The synthesized ZnO nanoparticles were characterized for the analysis of structural and optical properties. Characterization with XRD and TEM shows that the synthesized particles were uniformly distributed, crystalline in nature with spherical shape and narro...

In this paper, the structural, optical and magnetic properties of pure ZnO and Fe/Co co-doped ZnO nanoparticles are presented. Rietveld refinement of XRD pattern revealed the single phase wurtzite structure for prepared samples. FTIR study confirmed the formation of tetrahedral coordination between zinc and oxygen ions. SEM and TEM techniques were...

Pure ZnO and Co-doped ZnO (Zn0.98Co0.02O) nano-powder have been synthesized by co-precipitation method. Detailed XRD analysis shows that prepared nanocrystalline samples have single phase, wurtzite structure. Relative increment in (002) Bragg peak has been observed due to one dimensional growth in Co ions doped ZnO. The SAED pattern and TEM images...

Pure ZnO and Co/Mn co-doped ZnO {Zn0.98-xCo0.02MnxO (0 ≤ x ≤ 0.06)} nanoparticles were synthesized by co-precipitation method. The structural, morphological and optical properties of prepared samples were explored in detail. Rietveld refinement of x-ray diffraction (XRD) data revealed the single phase, hexagonal wurtzite structure without any impur...

Versatile Titanium dioxide (TiO2) having tetragonal crystal system with tuneable photochromic behavior is widely used in photochromic devices. TiO2 possess various characteristics such as strong light scattering, incident light reflection capability, optimum optical band gap, hence making it suitable to be used as a photochromic material in smart w...

Mesoporous photocatalyst Zinc Oxide (ZnO) nanoparticles have been synthesized via co-precipitation method. The effect of different annealing temperatures (300 °C and 700 °C) on the samples have been investigated by characterization techniques like High Resolution X-Ray diffraction (HR-XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ra...

Quantum dot (QD) has emerged as a promising agent in the field of solar energy conversion due to its distinct size-dependent optoelectronic characteristics. As next generation solar cell having facile and low cost fabrication techniques, quantum dot sensitized solar cell (QDSSC) has great potential to meet global demand for clean energy. In this ty...

Metal oxide exhibits several unique properties, such as solar cells and sensors. The nanoparticles of Chromium and Manganese have been synthesized with the use of ligand metal complex. Hydra zone based Schiff’s base has been used as the precursor for Cr and Mn nano powder. The synthesized samples were characterized to obtain the structural, morphol...

Monitoring the fabrication process of a solar cell entails measurements of mechanical, optical and electronic properties of the different layers and coatings of solar energy materials coated on transparent conducting oxides (TCOs) substrates like fluorine doped tin oxide (FTO) or Indium doped tin oxide (ITO). This article focuses on electronic char...

APPROACH The increase in demands for fossil fuels and their excess use are posing a great pressure on available world-energy reserves. Major progress has been made in the field of renewable energy technologies like solar cells. There is an immense need of a new technology that can make more practical and price competitive with fossil fuels such tha...

The most prominent component of solar cells is the counter electrode. It should be able to keep the overvoltage low at photocurrent densities upto 20 mA/cm2, good catalyst and possess high conductivity. The type of material or configuration used for fabrication of photocathode will determine the solar cell conversion efficiency. This paper covers a...

Dye sensitized solar cells (DSCs) provide a potential alternative to conventional p-n junction photovoltaic devices. The semiconductor thin film plays a crucial role in the working of DSC. This paper aims at formulating a process for the selection of optimum semiconductor material for nanostructured thin film using multiple attribute decision makin...