Kongkham Nomita Devi

Manipur University · Physics Department

Immobilization of powdered nanoparticles within a polymer matrix is considered a practical solution to address the challenge of the difficult recovery of the material after the photodegradation experiment. For the first time, this paper reports a low-energy visible light-driven photocatalytic degradation of Malachite Green dye utilizing free-standi...

Transport properties of Polyvinyl alcohol/ZnO nanocomposites(PVA/ZnO) of varying ZnO nanofiller is studied focussing on their potential application in electronic device application. The structural, morphological and elemental composition studies of the prepared samples are done by X‐ray diffraction(XRD), Scanning electron microscope(SEM) and Energy...

In this paper, optical and transport properties of Polyvinyl Alcohol/Silver incorporated Zinc Oxide (PVA/Ag–ZnO) nanocomposites of varying Ag–ZnO nanoparticles content prepared by solution casting method are studied to explore their multifunctional applications. The nanocomposites are characterized using X-ray diffraction, Scanning electron microsc...

Low temperature-dependent I-V measurement was adopted to investigate an insight into the effect of synthesis temperature on the field and temperature-dependent charge transport properties of electrochemically polymerized poly(3-methylthiophene) devices. Devices having different doping levels were fabricated at two different temperatures, one at roo...

Gd-doped ZnO (GdxZn1-xO, where x = 0.00, 0.03, 0.06, 0.09 and x = 0.12) with rich oxygen vacancy defects was synthesized by co-precipitation method. The formation of hexagonal wurtzite structure of ZnO and Gd doped ZnO was confirmed by X-ray Diffraction (XRD). Energy Dispersive X-ray (EDX) analysis shows the presence of zinc, gadolinium, and oxygen...

Organic dyes mainly used in dyeing process in textile industry contribute largely to water pollution which affects the environment and mankind directly or indirectly. ZnS, ZnO and ZnO/ZnS composites in the ratio 2:1, 1:1 and 1:2 were successfully synthesized by chemical method for efficient photodegradation of malachite green (MG) dye. Enhanced pho...

The present study involves the successful synthesis of ZnO and ZnO/CuO composites with different compositional ratio 4:1, 3:2, 2:3, 1:1 and 1:4 by hydrothermal method. The synthesized samples were characterized by X-ray diffraction (XRD) technique, UV–Visible and Fourier Transform Infra-Red (FTIR) spectroscopy. The photocatalytic activities of the...

Simple co-precipitation method was employed for the successful preparation of metal sulfide nanostructures (ZnS and CdS). The structural properties of the samples were investigated using X-Ray Diffraction (XRD) technique. The crystallite size of CdS and ZnS were observed to be 3.2 nm and 3.3 nm respectively. The optical properties of the samples we...

Polyvinyl alcohol/Zinc oxide (PVA/ZnO) nanocomposite films with various weight percentages of ZnO nanoparticles (0 wt%, 5 wt%, 10 wt%, 15 wt%, 20 wt%) were prepared by solution casting method. The structural, optical and morphological properties of the synthesized samples were characterized by X-ray diffraction (XRD), UV–Visible spectroscopy, Fouri...

Temperature dependent DC current-voltage (I-V) down to 50 K and field-dependent AC impedance measurements were carried out to study the electric field and temperature dependence of charge carrier mobility in Poly(3-octylthiophene) based metal/polymer/metal device structures of different charge carrier concentrations. In highly doped device, a negat...

Zn1 − xNixO (x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) was synthesized successfully using chemical co-precipitation method. The structural, morphological and optical properties of the synthesized samples were investigated using XRD (X-ray diffraction), SEM (scanning electron microscope), EDX (energy-dispersive X-ray), TEM (transmission electron microscop...

Pure SnO2 nanostructure was successfully synthesized using simple hydrothermal method. The properties of the synthesized samples were characterized using XRD (X Ray Diffraction) spectroscopy, SEM (Scanning Electron Microscope) and FTIR (Fourier Transform Infrared) spectroscopy. The photocatalytic efficiency of the synthesized samples were investiga...

ZnO nanoparticle was successfully synthesized by green and chemical methods. The structural and morphological properties were characterized by X-Ray diffraction (XRD) and Scanning Electron Microscope (SEM). The optical properties were analyzed by UV-Visible absorption and Fourier Transform Infra Red (FTIR) spectroscopy. Degradation of malachite gre...

The photocatalytic activities of ZnO nanoparticles, synthesized by two methods, towards the degradation of Malachite green (MG) dye were studied and compared. Green synthesized ZnO nanoparticle was observed to be more effective in photodegradation and the effect of operating parameters such as catalyst loading, initial dye concentration and pH was...

The present study involves the successful synthesis of zinc oxide and tin oxide nanoparticles by green and chemical co-precipitation methods respectively. The synthesized samples were characterized by X-ray diffraction (XRD) and UV-visible absorption techniques. XRD analysis confirms the formation of hexagonal wurtzite structure of ZnO and pure cas...

Thermal and electric field activated charge transport mechanism in Silver/Poly(3-methylthiophene)/Stainless Steel device with different charge carrier concentrations is studied. Temperature dependent Current-Voltage (I–V) characteristics of the devices show disorder induced non-linear behaviour $I\propto {V}^{m}.$ Depending upon temperature range,...

Photocatalytic degradation of aqueous solution of methylene blue dye under UV light illumination was studied by using manganese doped ZnO (Zn1-xMnxO, where x=0.00,x=0.02andx=0.05) nanoparticles as a photocatalyst. The nanophotocatalysts were synthesized by wet chemical co-precipitation method. The structural, morphological, and optical properties o...

Manganese doped ZnO nanoparticles with compositional formula were prepared by chemical co precipitation method. The nanoparticles were characterized by using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy and UV-visible Spectroscopy techniques. Structural and optical properties of the nanoparticles...

Co doped ZnO nanospindles with general compositional formula Zn1−xCoxO (0 ≤ x ≤ 0.1) are prepared by wet chemical co precipitation method. The samples are characterized for its structural, morphological, compositional and optical properties by X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy dispersive analysis of X-rays (EDAX),...

In this paper we report the synthesis of multiferroic BiFeO3 (BFO)–CoFe2O4 (CFO) nanocomposites. The XRD and SEM data confirm the formation of both the parent compounds and the composite. All the composite samples show typical frequency dispersion at low frequency. The composite samples possess low dielectric loss. The frequency dependence of ac el...

Cd1-xMnxS (x = 0.0, 0.02, 0.04, 0.06, 0.08, 0.1) nanoparticles have been synthesized by chemical co-precipitation method. Structural characterization of the samples has been performed using X-ray diffraction (XRD). XRD patterns show that dopant atoms of manganese (Mn) are incorporated at the Cd sites in cubic structure without disturbing original C...

Manganese (Mn) substituted nanocrystalline Bismuth Ferrite (BiFe1-xMnxO3) thin films were deposited on quartz substrates by sol-gel process and the effect of the substitution on the structural and optical properties of BiFe1-xMnxO3 system was studied. With the increase in Mn content up to 30%, a distortion in crystal lattice constants and contracti...

Nanocrystalline CdS thin films were deposited on glass substrate by chemical bath deposition method using Cadmium Sulphate and Thiourea as Cd+2 and S-2 ion sources for different molarities i.e. 0.1 M, 0.2 M and 0.3 M. The crystallite size and lattice parameters for each sample were determined from X-Ray diffraction data using Scherrers formula. The...

Nickel (Ni) substituted ZnO nanopowders were synthesized by simple and efficient co-precipitation method with zinc nitrate and nickel nitrate as the starting materials. Effect of Ni substitution on structural and photoluminescence properties of ZnO nanopowders has been studied. Structural characterization of the as prepared powders was performed wi...

CdS nanoparticles have been synthesized by chemical co-precipitation method using PVA as a capping agent. Structural characterization of the as synthesized CdS nanoparticles were performed by X-ray diffraction (XRD) study which showed hexagonal structure with average crystallite size of 11 nm and lattice constants a=4.106 Å, c=6.637 Å. Optical char...

Medicinal herbs have been used from antiquity by humanity. This paper discusses the elemental composition and concentration of ten Indian medicinal plants investigated by particle induced X-ray emission (PIXE) technique. The accuracy and precision of the technique were assured by analyzing three Certified Standard Reference Materials-cabbage (GBW 0...

Cadmium sulphide thin films were deposited by the vacuum evaporation technique onto well clean glass substrate held at 200 °C. The films have been annealed, in air, at two different temperatures, 300 °C and 350 °C. X-ray diffraction studies confirmed the polycrystalline hexagonal CdS phase formation. The structural parameters such as lattice parame...

Tin oxide (SnO2) thin films are prepared by spin coating onto well-cleaned glass substrates using stannous chloride and methanol solution as complexing agent. Films of different thicknesses are annealed at 400° C. Optical properties are studied using UV-Visible spectrophotometer. The films are highly transparent in the visible region. It is found t...

The quantitative estimation of various trace element concentrations in medicinal plants is necessary for determining their effectiveness in treating various diseases and for understanding their pharmacological action. Elemental concentrations of some selected medicinal plants of north east India was measured by proton induced X-ray emission (PIXE)...

Elemental analysis of some selected medicinal plants of northeast India having anti-diabetic property was conducted using proton-induced X-ray emission (PIXE) technique. Plant samples were excited with a 2.4-MeV proton beam from a 3-MV Tandetron accelerator, and the spectral data were analyzed by using GUPIX, a software package for fitting PIXE spe...

Proton induced X-ray emission (PIXE) and proton induced γ -ray emission (PIGE) techniques were employed for the elemental analysis of twelve different plants traditionally used for medicinal purposes in north east India. PIXE is a well established ion beam analysis technique for the sensitive and non destructive determination of various elements ha...

Proton induced X-ray emission (PIXE) and proton induced γ-ray emission (PIGE) techniques are employed for the determination of essential and trace elements in some commonly used medicinal plants of north east India. Light elements such as Na, Mg, Al and P are determined by PIGE while medium Z elements such as K, Ca, Mn, Fe, Cu, Zn, Rb and Sr are de...

Rhizomes of seven medicinal Zingiberales commonly used in Manipur have been analysed by the proton induced X-ray emission (PIXE) technique. The elements K, Ca, Mn, Fe, Cu, Zn, Rb and Sr are found to be present in varying concentrations. K and Ca have been estimated at percentage level while other elements are quantified at ppm level. Among the trac...

The dielectric properties and dc conductivity of lampblack samples have been investigated. The dielectric constant (ε) and loss tangent (tan δ) show strong frequency dependence. The dielectric constant also shows an anomaly peak at about 330K, while no such peak was observed in tan δ. Two distinct regions can be divided in the dc conductivity (σdc)...