AC conductivity studies in copper decorated and zinc oxide embedded polypyrrole composite nanorods: Interfacial effects

2020 ◽  
Vol 110 ◽  
pp. 104963 ◽  
Author(s):  
R. Megha ◽  
Y.T. Ravikiran ◽  
S.C. Vijaya Kumari ◽  
H.G. Rajprakash ◽  
S. Manjunatha ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ac Conductivity ◽  
Interfacial Effects ◽  
Polypyrrole Composite ◽  
Composite Nanorods

scholarly journals Nonisothermal Kinetic Analysis and AC Conductivity for Polyvinyl Chloride (PVC)/Zinc Oxide (ZnO) Nanocomposite

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Huda AlFannakh
Keyword(s):  
Thermal Stability ◽  
Zinc Oxide ◽  
Kinetic Analysis ◽  
Zno Nanoparticles ◽  
Ac Conductivity ◽  
Zno Nanoparticle ◽  
Nonisothermal Kinetic ◽  
Increasing Temperature ◽  
Host Polymer ◽  
Nonisothermal Kinetic Analysis

The behavior of polyvinyl chlorine (PVC)/zinc oxide (ZnO) nanoparticles was investigated. To improve the dispersion and distribution of zinc nanoparticles within the host polymer (PVC), they were treated with water before being added to the polymer. The nanocomposite samples were prepared by casting method using different weight ratios of ZnO nanoparticles. The prepared nanocomposite samples were characterized by thermogravimetric analysis (TGA). Both thermal stability and kinetic analysis of the prepared samples were investigated. The ZnO nanoparticles lower the activation energy and decrease the thermal stability of PVC. Kissinger, Flynn-Wall-Ozawa, and Kissinger-Akahira-Sunose models were used in the nonisothermal kinetic analysis of PVC/ZnO nanocomposite samples. The thermal stability behavior due to the addition of zinc oxide nanoparticles was explained and correlated with the behavior of the kinetic parameters of the samples. The AC conductivity as function of frequency and temperature was also investigated. The addition of ZnO nanoparticle increases the AC conductivity, and the temperature-independent region decreased by increasing temperature. Both S and A coefficients were predicted using the Jonscher power law and OriginLab software. The trends of S and A coefficients were discussed based on the glass transition of the host polymer.

scholarly journals Template-Assisted Electrochemical Synthesis of CdSe Quantum Dots—Polypyrrole Composite Nanorods

2020 ◽  
Vol 10 (17) ◽  
pp. 5966
Author(s):  
Won-Seok Kang ◽  
Taegon Oh ◽  
Gwang-Hyeon Nam ◽  
Hyo-Sop Kim ◽  
Ki-Suk Kim ◽  
...  
Keyword(s):  
Simple Procedure ◽  
Hybrid Structure ◽  
Proof Of Concept ◽  
Interface Area ◽  
Anodic Aluminum ◽  
Enhanced Photoluminescence ◽  
Polypyrrole Composite ◽  
High Level ◽  
Oxide Membranes ◽  
Composite Nanorods

Luminescent nanoparticles have reached a high level of maturity in materials and spectral tunability for optics and optoelectronics. However, the lack of facile methodology for heterojunction formation of the nanoparticles provides many challenges for scalability. In this paper we demonstrate a simple procedure to synthesize a nanoparticle-embedded polymer nanorod hybrid structure via a template-based electrochemical method using anodic aluminum oxide membranes. This method enables the formation of interactive nanostructures wherein the interface area between the two components is maximized. As a proof of concept, semiconducting CdSe nanoparticles were embedded in polypyrrole nanorods with dimensions that can be finely tuned. We observed enhanced photoluminescence of the hybrid structures compared with bare polypyrrole nanorods.

Structural and Dielectric Properties of Zn1-xMoxO Nanoparticles

2020 ◽  
Vol 13 (2) ◽  
pp. 165-170
Keyword(s):  
Zinc Oxide ◽  
Dielectric Properties ◽  
Ac Conductivity ◽  
Hexagonal Wurtzite Structure ◽  
Dielectric Constants ◽  
Precipitation Method ◽  
Dielectric Parameters ◽  
Mo Doping ◽  
Lcr Meter ◽  
Co Precipitation

Abstract: In this work, samples of zinc oxide nanoparticles doped by molybdenum (Zn1-xMoxO with 0 ≤ x ≤ 0.1) were prepared by using the wet co-precipitation method. The characterization of the prepared samples was carried out by means of X-ray powder diffraction (XRD). The samples reserved their hexagonal wurtzite structure with Mo doping and showed a decrease in the crystallite size up to x = 0.04 followed by a further increase. On the other hand, dielectric measurements were performed using an LCR meter. The effect of frequency and temperature on the dielectric properties such as the real and imaginary parts of dielectric constant (ε^' and ε'', respectively), dielectric loss (tanδ) and ac-conductivity (σ_ac) of Mo-doped zinc oxide samples, was studied in the frequency range (100 Hz - 1 MHz) and at temperatures (300 - 773 K). The values of room temperature dielectric parameters were found to be strongly dependent on the Mo-doping. However, the increase in temperature caused an enhancement in the values of the dielectric parameters, particularly at 773 K. Keywords: Zinc oxide, XRD, Dielectric constants, Ac-conductivity.

Field emission properties of zinc oxide/zinc tungstate (ZnO/ZnWO 4 ) composite nanorods

2013 ◽  
Vol 231 ◽  
pp. 289-292 ◽  
Author(s):  
Bohr-Ran Huang ◽  
Tzu-Ching Lin ◽  
Kuo-Ting Chu ◽  
Ying-Kan Yang ◽  
Jun-Cheng Lin
Keyword(s):  
Zinc Oxide ◽  
Field Emission ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Zinc Tungstate ◽  
Composite Nanorods

Synthesis, Structural, Optical and Dielectric Studies on Carbon Dot-Zinc Oxide Nanocomplexes

2018 ◽  
Vol 17 (05) ◽  
pp. 1750021
Author(s):  
S. Ajin Sundar ◽  
N. Joseph John
Keyword(s):  
Zinc Oxide ◽  
Ac Conductivity ◽  
Phase Segregation ◽  
Hexagonal Structure ◽  
Dielectric Studies ◽  
Strong Absorption Band ◽  
Carbon Dot ◽  
Increase With Increase ◽  
Conductivity Increase ◽  
Wet Chemical

In the present manuscript, we have reported the synthesis, structural, optical, AC conductivity and dielectric studies of carbon dot-zinc oxide (CDZO) nanocomplexes. CDZO nanocomplexes were synthesized by the wet chemical method. The refinement of X-ray powder diffraction data reveals that the sample possesses hexagonal structure of ZnO. The low intensity diffraction peaks corresponding to carbon come to existence, it is suggested that phase segregation has occurred in the CDZO nanoparticles. The strong absorption band observed in the UV region for the prepared samples can be attributed to the band edge absorption. Dielectric property and AC conductivity have been studied as a function of frequency (100[Formula: see text]Hz and 1[Formula: see text]kHz) of the applied AC signal in the temperature range 30[Formula: see text]C to 150[Formula: see text]C. The result showed that AC conductivity increases with increase of temperature. Dielectric loss and DC conductivity increase with increase of temperature.

Synthesis of Zinc Oxide and Titanium Dioxide Composite Nanorods and Their Photocatalytic Properties

2016 ◽  
Vol 25 (1) ◽  
pp. 096369351602500 ◽  
Author(s):  
L. Z. Pei ◽  
T. Wei ◽  
N. Lin ◽  
H. Y. Yu
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Light Irradiation ◽  
Hydrothermal Temperature ◽  
Titanium Butoxide ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Composite Nanorods

Zinc oxide and titanium dioxide composite nanorods have been synthesized by the hydrothermal process using zinc acetate and titanium butoxide as the raw materials. X-ray diffraction (XRD) shows that the composite nanorods are composed of hexagonal ZnO and tetragonal TiO2 phases. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that the length and diameter of the composite nanorods are 1–5 μm and 80–350 nm, respectively. Hydrothermal temperature and duration time have important roles in the formation of the composite nanorods. Using rhodamine B (RB) degradation as the probe reaction, the photocatalytic activities of the composite nanorods under UV light irradiation have been analysed. The roles of the irradiation time, content of the composite nanorods and RB concentration in the photocatalytic activities of the composite nanorods have been investigated. 10 mL 10 mgL−1 RB solution can be totally degraded using 10 mg composite nanorods under UV light irradiation for 90 min.

Extraction and identification of fillers and pigments from pyrolyzed rubber and tire samples

1996 ◽  
Vol 54 ◽  
pp. 174-175
Author(s):  
P. Sadhukhan ◽  
J. B. Zimmerman
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Carbon Black ◽  
Natural Rubber ◽  
Transmission Electron Microscope ◽  
Rolling Resistance ◽  
Synthetic Polymers ◽  
Nitrogen Atmosphere ◽  
Transmission Electron ◽  
Curing Agents

Rubber stocks, specially tires, are composed of natural rubber and synthetic polymers and also of several compounding ingredients, such as carbon black, silica, zinc oxide etc. These are generally mixed and vulcanized with additional curing agents, mainly organic in nature, to achieve certain “designing properties” including wear, traction, rolling resistance and handling of tires. Considerable importance is, therefore, attached both by the manufacturers and their competitors to be able to extract, identify and characterize various types of fillers and pigments. Several analytical procedures have been in use to extract, preferentially, these fillers and pigments and subsequently identify and characterize them under a transmission electron microscope.Rubber stocks and tire sections are subjected to heat under nitrogen atmosphere to 550°C for one hour and then cooled under nitrogen to remove polymers, leaving behind carbon black, silica and zinc oxide and 650°C to eliminate carbon blacks, leaving only silica and zinc oxide.

Analysis of Sputtered Zinc Oxide Films

1980 ◽  
Vol 38 ◽  
pp. 416-417
Author(s):  
T. A. Emma ◽  
M. P. Singh
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Piezoelectric Materials ◽  
Oxide Films ◽  
Optical Quality ◽  
Zno Films ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Sputtered Films ◽  
Zinc Oxide Films

Optical quality zinc oxide films have been characterized using reflection electron diffraction (RED), replication electron microscopy (REM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Significant microstructural differences were observed between rf sputtered films and planar magnetron rf sputtered films. Piezoelectric materials have been attractive for applications to integrated optics since they provide an active medium for signal processing. Among the desirable physical characteristics of sputtered ZnO films used for this and related applications are a highly preferred crystallographic texture and relatively smooth surfaces. It has been found that these characteristics are very sensitive to the type and condition of the substrate and to the several sputtering parameters: target, rf power, gas composition and substrate temperature.

Sign in / Sign up

Export Citation Format

Share Document