Investigation of Electrical Properties of Polyaniline Nanocomposites by Impedance Spectroscopy

2010 ◽  
Vol 442 ◽  
pp. 356-363 ◽  
Author(s):  
A.B. Afzal ◽  
M. Javed Akhtar ◽  
M. Nadeem ◽  
M. Masood-ul Hassan
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Metal Nanoparticles ◽  
Chemical Method ◽  
Microphase Separation ◽  
Conductivity Relaxation ◽  
Considerable Decrease ◽  
Gas Condensation ◽  
Repeat Units ◽  
Embedded Nanoparticles

Polyaniline (PANI) nanocomposites were synthesized by incorporating separately synthesized metal nanoparticles in 1-methyl-2-pyrrolidinone (NMP) solution of polyaniline. PANI was prepared by oxidative reduction of aniline using chemical method. Silver nanoparticles were produced by inert gas condensation; whereas gold nanoparticles were synthesized by the reduction of gold salt. FTIR confirmed the formation of PANI in all samples. The electrical properties of the nanocomposites were determined by impedance spectroscopy. The conductivity relaxation analysis suggested microphase separation of NMP plasticized films into phases of reduced and oxidized repeat units. The conductivity of PANI films increases with the increase in concentration of embedded nanoparticles. Incorporation of metal nanoparticles in PANI causes considerable decrease in the real part of impedance.

The Structure and Electrical Properties of Polyaniline

2001 ◽  
Vol 699 ◽  
Author(s):  
Runqing Ou ◽  
Robert J. Samuels ◽  
Rosario A. Gerhardt
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Molecular Orientation ◽  
Polymeric Films ◽  
Anisotropic Structure ◽  
Conductivity Relaxation ◽  
Test Fixture ◽  
Polyaniline Films ◽  
Infrared Dichroism

AbstractThe anisotropic structure of EB polyaniline films cast from N, N'-Dimethylpropylene urea (DMPU) solution and stretched to different draw ratios was studied by infrared dichroism. The drawn films were doped with 1.0 M HCl and the electrical properties were studied by impedance spectroscopy. A new test fixture has been developed to measure the in-plane impedance of polymeric films. A Debye-like conductivity relaxation was observed for all the HCl-doped PANI samples. The conductivity along the stretch direction increases with molecular orientation. The in-plane conductivity is significantly higher than the through-plane conductivity.

Electrical properties of (Cu1-xAgx)7GeS5I crystals investigated by impedance spectroscopy

2021 ◽  
Vol 363 ◽  
pp. 115593
Author(s):  
V. Kavaliukė ◽  
T. Šalkus ◽  
S. Balčiūnas ◽  
J. Banys ◽  
A.I. Pogodin ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy

scholarly journals Electrical Impedance Spectroscopy as Electrical Biopsy for Monitoring Radiation Sequelae of Intestine in Rats

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Pei-Ju Chao ◽  
Eng-Yen Huang ◽  
Kuo-Sheng Cheng ◽  
Yu-Jie Huang
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Integrated Circuits ◽  
Electrical Impedance ◽  
Roc Analysis ◽  
Electrical Impedance Spectroscopy ◽  
Electrical Characteristics ◽  
Injury Score ◽  
Histological Changes ◽  
Radiation Sequelae

Electrical impedance is one of the most frequently used parameters for characterizing material properties. The resistive and capacitive characteristics of tissue may be revealed by electrical impedance spectroscopy (EIS) as electrical biopsy. This technique could be used to monitor the sequelae after irradiation. In this study, rat intestinal tissues after irradiation were assessed by EIS system based on commercially available integrated circuits. The EIS results were fitted to a resistor-capacitor circuit model to determine the electrical properties of the tissue. The variations in the electrical characteristics of the tissue were compared to radiation injury score (RIS) by morphological and histological findings. The electrical properties, based on receiver operation curve (ROC) analysis, strongly reflected the histological changes with excellent diagnosis performance. The results of this study suggest that electrical biopsy reflects histological changes after irradiation. This approach may significantly augment the evaluation of tissue after irradiation. It could provide rapid results for decision making in monitoring radiation sequelae prospectively.

Impedance spectroscopy and morphology of SrBi4Ti4O15 ceramics prepared by soft chemical method

2009 ◽  
Vol 477 (1-2) ◽  
pp. 706-711 ◽  
Author(s):  
S.K. Rout ◽  
Ali Hussian ◽  
J.S. Lee ◽  
I.W. Kim ◽  
S.I. Woo
Keyword(s):  
Impedance Spectroscopy ◽  
Chemical Method

Chitosan-Bentonite Crosslinked Film As Indicator for Copper (II) Ions Adsorption

2021 ◽  
Author(s):  
Nurul Huda Osman ◽  
Nurul Najiha Mazu ◽  
Josephine Liew Ying Chyi ◽  
Muhammad Mahyiddin Ramli ◽  
Mohammad Abdull Halim Mohd Abdull Majid ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Dc Conductivity ◽  
Dielectric Constants ◽  
Peak Amplitude ◽  
Electrical Parameters ◽  
Before And After

This paper reports on chitosan/bentonite crosslinked (ChB-ECH) film for removal of Cu (II). The effects of chitosan/bentonite ratio on the removal percentage were studied along with the effect of different Cu (II) concentration and the contact time on the film adsorption capacity, qt. The electrical properties of the film are studied, before and after the adsorption occurred, by using impedance spectroscopy for different parameters such as DC conductivity, the complex dielectric constants (ε’ and ε”) and complex electrical modulas (M’ and M’’). The results showed that the chitosan/bentonite ratio of 3:1 produces highest removal percentage at 29 %, while the contact time of 120 minutes was found to be optimum. An increment in the DC conductivity of the ChB-ECH film’s was observed up to 10-7 S/cm as the removal percentage of film increased. The film with the highest Cu (II) adsorb also showed the highest value for ε’ and ε” while exhibiting non-Derby behavior. Shifting of peak amplitude of the M” towards the higher frequency was also observed as the Cu (II) adsorption in the film increased. The results showed that all the electrical parameters can be utilized to determine the amount of adsorbed copper (II) in chitosan/bentonite film.

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