Showing papers by "Ajit Kumar Meikap published in 2018"
TL;DR: In this paper, the dielectric constant, conductivity, impedance spectroscopy and current-voltage characteristic of zinc contain diamond-like carbon (Zn-DLC) films prepared by a combination of plasma source ion implantation with magnetron sputtering of a zinc target.
25 citations
TL;DR: In this article, the synthesis of BiFeO3 (BFO) nanoparticles (NPs) by sol-gel method is demonstrated by using BFO filler in PVA matrix.
20 citations
TL;DR: In this paper, the electrical transport properties of Gd doped YCrO 3 nanoparticles synthesized by sol-gel method in the temperature range 298 −523 K and in the frequency range 100 −Hz −1MHz were reported.
18 citations
TL;DR: In this article, the formation of a free-standing film containing oriented functionalized single-walled carbon nanotubes (SWCNT) grafted by poly(vinyl alcohol) (PVA) using a simple solution casting technique is demonstrated.
Abstract: The formation of a free-standing film containing oriented functionalized single-walled carbon nanotube (SWCNT) grafted by poly(vinyl alcohol) (PVA) using a simple solution casting technique is demo...
17 citations
TL;DR: In this article, the authors proposed a novel electrode for the electrochemical detection of fluoride ion (F−) present in water by growing thin iron (III) oxide hydroxide film on conducting glass substrate through simple and cost effective dip coating technique.
15 citations
TL;DR: In this article, a novel technique to obtain a higher or lower value of dielectric constant due to the variation of a functional group on the surface of multiwall carbon nanotube (MWCNTs) for a polyvinyl alcohol (PVA) grafted MWCNT system was presented.
Abstract: We present a novel technique to obtain a higher or lower value of dielectric constant due to the variation of a functional group on the surface of multiwall carbon nanotube (MWCNTs) for a polyvinyl alcohol (PVA) grafted MWCNT system. We have prepared PVA grafted pristine and different types of functionalized (-COOH, -OH, and -NH2) MWCNT nanocomposite films. The strong interfacial interaction between the host PVA matrix and nanofiller is characterized by different experimental techniques. The frequency variation of the electrical transport properties of the composite films is investigated in a wide temperature range (303 ≤ T ≤ 413 K) and frequency range (20 Hz ≤ f ≤ 1 MHz). The dielectric constant of the amine (-NH2) functionalized MWCNT incorporated PVA film is about 2 times higher than that of the pristine MWCNT embedded PVA film. The temperature variation of the dielectric constant shows an anomalous behaviour. The modified Cole-Cole equation simulated the experimentally observed dielectric spectroscopy at high temperature. The ac conductivity of the composite films obeys the correlated barrier hopping model. The imaginary part of the electric modulus study shows the ideal Debye-type behaviour at low frequency and deviation of that at high frequency. To illustrate the impedance spectroscopy of the nanocomposite films, we have proposed an impedance based battery equivalent circuit model. The current-voltage characteristic shows hysteresis behaviour of the nanocomposite films. The trap state height for all composite films is evaluated by simulating the current density-electric field data with the Poole-Frenkel emission model. This investigation opens a new avenue for designing electronic devices with a suitable combination of cost effective soft materials.
15 citations
TL;DR: In this article, a comprehensive study on hysteresis behavior of currentvoltage characteristic and impedance spectroscopy of granular semicrystalline polyvinyl alcohol (PVA) film is presented.
8 citations
TL;DR: In this paper, the disorder dependence electron phonon scattering rate in three dimensional disordered V82Pd18−−xFex alloys has been systematically investigated and a minimum in temperature dependence resistivity curve has been observed at low temperature T = T m.
4 citations
01 Apr 2018
3 citations
01 Jan 2018
TL;DR: In this article, a new kind of polyaniline (PANI)-based carbon nanotubes (CNTs)-CdS or ZnS semiconducting composites have been developed via in-situ polymerization of aniline monomer in the presence of multiwalled CNTs and dispersed CdS nanoparticles.
Abstract: In the polymer industry, there is a continuous search toward new materials with improved properties. In the early days, chemists developed new monomers for the polymerization of new materials. Later, more efforts were devoted to improving properties of existing polymers by introducing several new materials with known properties to create new grades with improved properties. This chapter demonstrates a new kind of polyaniline (PANI)-based carbon nanotubes (CNTs)—CdS or ZnS semiconducting composites—which have been developed via in situ polymerization of aniline monomer in the presence of multiwalled CNTs and dispersed CdS or ZnS nanoparticles. The in situ polymerization of aniline monomer in the presence of CNTs and semiconducting nanomaterials is one of the most efficient and versatile ways to synthesize PANI nanocomposites. Because of the good interfacial adhesion between PANI matrix, CNTs and semiconducting materials (CdS, ZnS) are crucial for successful preparation, and they have enhanced optical and electrical properties than base polyaniline.
3 citations
10 Apr 2018
TL;DR: Tungsten oxide (WO3) nanoplates have been synthesized via hydrothermal method and the average crystallite size of the WO3 is 28.9 ± 0.5 µm as mentioned in this paper.
Abstract: Tungsten oxide (WO3) nanoplates have been synthesized via hydrothermal method. The average crystallite size of the nanoplates is 28.9 ± 0.5 nm. The direct and indirect band gap of WO3 is observed. The AC conductivity of PVA-WO3 composite film has been observed and carrier transport mechanism follows correlated barrier hopping model. The maximum barrier height of the composite film is 0.1 eV. The electric modulus reflects the non-Debye type behaviour of relaxation time which is simulated by Kohlrausch-Willims-Watts (KWW) function.Tungsten oxide (WO3) nanoplates have been synthesized via hydrothermal method. The average crystallite size of the nanoplates is 28.9 ± 0.5 nm. The direct and indirect band gap of WO3 is observed. The AC conductivity of PVA-WO3 composite film has been observed and carrier transport mechanism follows correlated barrier hopping model. The maximum barrier height of the composite film is 0.1 eV. The electric modulus reflects the non-Debye type behaviour of relaxation time which is simulated by Kohlrausch-Willims-Watts (KWW) function.
01 Jan 2018
TL;DR: In this article, perovskite-type La-doped Yttrium Chromite (Y1−XLaxCrO3) nanoparticles are prepared via sol-gel method.
Abstract: Perovskite-type La-doped Yttrium Chromite (Y1–XLaxCrO3) nanoparticles are prepared via sol–gel method. The formation of the compound is confirmed by X-ray diffraction (XRD) technique. Particle sizes are calculated by Transmission Electron Microscopy (TEM) measurements. Electrical DC conductivity is studied. DC conductivity analysis shows that all the samples have semiconducting behavior. Dc activation energy decreases when the lanthanum doping content is increased. The dielectric properties of all the samples are studied within the temperature range 298–523 K and in the frequency range 20–1 MHz. Impedance (AC) analysis suggests that the assistance of grain boundary governs over the grain.
10 Apr 2018
TL;DR: Gadolinium doped Yttrium Chromite nanoparticles are synthesized following sol-gel method as mentioned in this paper, and the formation of the nanoparticles is confirmed by XRD and TEM measurements.
Abstract: Gadolinium doped Yttrium Chromite nanoparticles are synthesized following sol-gel method. The formation of the nanoparticles are confirmed by XRD and TEM measurements. Dielectric permittivity and dielectric loss are estimated within the temperature range 298K to 523K and in the frequency range 20 Hz to 1 MHz. Dielectric permittivity follows the power law e′(f) ∝ Tm. It is observed that the temperature exponent m increases with the decreasing frequency. The temperature variation of resistivity shows that the samples have semiconducting behavior. The activation energy is also measured.