Electrical conductivity, isothermal stability and amine sensing studies of a synthetic poly-o-toluidine/multiwalled carbon nanotube/Sn(iv) tungstate composite ion exchanger doped with p-toluene sulfonic acid

2015 ◽  
Vol 7 (5) ◽  
pp. 2077-2086 ◽  
Author(s):  
Asif Ali Khan ◽  
Shakeeba Shaheen
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Sulfonic Acid ◽  
Oxidative Polymerization ◽  
Multiwalled Carbon ◽  
Electrically Conductive ◽  
Toluene Sulfonic Acid ◽  
Composite Ion Exchanger

An electrically conductive poly-o-toluidine (POT) composite doped with p-toluene sulfonic acid (pTSA) was prepared using multiwalled carbon nanotubes (MWCNTs) and Sn(iv) tungstate (ST) by in situ oxidative polymerization.

P-Toluene Sulfonic Acid Doped Polyaniline/Carbon Nanotube Nanocomposites by a Sequential Doping-Dedoping-Redoping Process

2014 ◽  
Vol 665 ◽  
pp. 315-318
Author(s):  
Yi Zhou ◽  
Wen Yi Li ◽  
Xiao Ping Wang ◽  
Hui Li ◽  
Qing Wu Tian ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Properties ◽  
Sulfonic Acid ◽  
Structural Defects ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Toluene Sulfonic Acid ◽  
Multi Walled Carbon Nanotube ◽  
Doped Polyaniline

HCl doped Polyaniline (PANI)/multi–walled carbon nanotube (MWCNT) nanocomposites were first prepared by in–situ chemical polymerization of aniline monomers in the presence of MWCNTs with less structural defects, and then p–toluene sulfonic acid (TSA) doped PANI/MWCNT nanocomposites were obtained by a sequential doping–dedoping–redoping process. The morphology, microstructure, and thermal and electrochemical properties of the resulting nanocomposites were investigated by scanning electron microscopy, fournier infrared spectroscopy, thermal gravimetric analysis, and cyclic voltammetry, respectively. The effects of TSA as the secondary dopant on the microstructure and electrochemical properties were discussed. The results indicated that a significant improvement in the thermal stability could be achieved, while good electrochemical behavior could be remained.

Well-Defined Blackberry-Like Polypyrrole Microspheres via Chemical Oxidative Polymerization in the Presence of Functional Floating Bead as In Situ Dopant

2014 ◽  
Vol 904 ◽  
pp. 159-163 ◽  
Author(s):  
Jia Ping Lao ◽  
Chao Yang ◽  
Hao Dao Mo ◽  
Yu Ping Li ◽  
Li Min Zang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Sulfonic Acid ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
High Electrical Conductivity ◽  
Chemical Oxidative Polymerization ◽  
Inorganic Substrate ◽  
Thermal Stability Of

Functional floating bead (F-FB), prepared by anchoring the organic sulfonic acid on the surface of the blackberry-like structural FB, was used as both the inorganic substrate and the in situ dopant for the in situ chemical oxidative polymerization of pyrrole to obtain the plypyrrole/functional floating bead (PPy/F-FB) nanocomposite material. The composites possess high electrical conductivity at room temperature. Thermogravimetric analysis shows that the thermal stability of PPy/F-FB composites was enhanced and these can be attributed to the retardation effect of sulfonic acid-functionalized FB as barriers for the degradation of PPy. The morphology of PPy/FB composites showed the well-defined blackberry-like morphology.

scholarly journals Electrically Conductive Nanocomposites Polymer of Poly(Vinyl Alcohol)/Glutaraldehyde/Multiwalled Carbon Nanotubes: Preparation and Characterization

2018 ◽  
Vol 18 (3) ◽  
pp. 383 ◽  
Author(s):  
Fitri Khoerunnisa ◽  
Hendrawan Hendrawan ◽  
Yaya Sonjaya ◽  
Rizki Deli Hasanah
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Polymer Matrix ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Electrically Conductive ◽  
X Ray ◽  
Conductive Nanocomposites

Electrically conductive nanocomposites polymer of poly(vinyl alcohol)/PVA, glutaraldehyde (GA) and multiwalled carbon nanotubes (MWCNT) has been successfully synthesized. The polymer nanocomposites were prepared by mixing PVA, GA (crosslinker), and MWCNT dispersion with an aid of ultrasonic homogenizer at 50 °C. The content of MWCNT, in particular, was varied in order to determine the effect of MWCNT on electrical conductivity of polymer composites. The polymer mixture was casted into a disc to obtain thin film. The electrical conductivity, surface morphology, and mechanical properties of the composites film were investigated by means of four probes method, FTIR spectroscopy, X-ray diffraction, SEM, AFM, and tensile strength measurement, respectively. It was found that the optimum composition of PVA (10%): GA (1%): MWCNT (1%) was 20:20:3 in volume ratio. The addition of MWCNT induced the electrically conductive network on polymer matrix where the electrical conductivity of nanocomposites film significantly increased up to 8.28 x 10-2 S/sq due to reduction of the contact resistance between conductive filler. Additionally, the mechanical strength of nanocomposites polymer were significantly increased as a result of MWCNT addition. Modification of morphological structure of composite film as indicated by FTIR spectra, X-ray diffraction patterns, SEM, and AFM images verified the effective MWCNT filler network in the polymer matrix.

Functionalisation of Microfluidic Channels with In Situ Grown Carbon Nanotubes

2005 ◽  
Vol 872 ◽  
Author(s):  
K. Gjerde ◽  
T. Schurmann ◽  
K.B.K. Teo ◽  
M. Aono ◽  
W.I. Milne ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Properties ◽  
Microfluidic Channels ◽  
Electrical Field ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Local Distortions

AbstractWe present a new route towards customizing the surface properties of microfluidic channels, by a forest of in situ grown multiwalled carbon nanotubes (CNT). Local distortions of the electrical field direction are used to control the direction of the carbon nanotube growth.

EFFECT OF PARA-HYDROXYBENZENE SULFONIC ACID ON THE PROPERTIES OF EX SITU PREPARED POLYANILINE/MULTIWALLED CARBON NANOTUBES–MnO2

NANO ◽  
2010 ◽  
Vol 05 (06) ◽  
pp. 369-373 ◽  
Author(s):  
SAIFUL IZWAN ABD RAZAK ◽  
SHARIF HUSSEIN SHARIF ZEIN ◽  
ABDUL LATIF AHMAD
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Electron Microscope ◽  
Multiwalled Carbon Nanotubes ◽  
Transmission Electron Microscope ◽  
Sulfonic Acid ◽  
Interfacial Interaction ◽  
Ex Situ ◽  
Multiwalled Carbon ◽  
Transmission Electron

New ex situ polyaniline (PANI)/ MnO2 -filled multiwalled carbon nanotubes (MWCNTs) nanocomposites using para-hydroxybenzene sulfonic acid (PHBSA) as a dopant and linker exhibit enhanced electrical conductivity and interfacial interaction. Strong and enhanced interfacial interaction was observed on the surfaces of the filled carbon nanotubes and PANI. Transmission electron microscope (TEM) demonstrated clearly the improved bonding at the interface compared to the nanocomposite without PHBSA.

A facile preparation of CoFe2O4 nanoparticles on polyaniline-functionalised carbon nanotubes as enhanced catalysts for the oxygen evolution reaction

2016 ◽  
Vol 4 (12) ◽  
pp. 4472-4478 ◽  
Author(s):  
Yang Liu ◽  
Jing Li ◽  
Feng Li ◽  
Wenzhu Li ◽  
Haidong Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Cofe2o4 Nanoparticles ◽  
Multiwalled Carbon ◽  
Mild Conditions ◽  
Facile Preparation

A polyaniline-multiwalled carbon nanotube supported, high performance CoFe2O4 nanoparticle loaded electrocatalyst is synthesized through a novel and simple in situ process under mild conditions.

Investigation of dielectric relaxation phenomena and AC electrical conductivity in graphite/carbon nanotubes/engine oil nanofluids

2020 ◽  
pp. 073168442095185
Author(s):  
S Barnoss ◽  
BMG Melo ◽  
M El Hasnaoui ◽  
MPF Graça ◽  
ME Achour ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Percolation Threshold ◽  
Complex Impedance ◽  
Engine Oil ◽  
Positive Temperature ◽  
Multiwalled Carbon ◽  
Remarkable Change ◽  
Ac Electrical Conductivity

In this paper, we report an investigation on electrical conduction mechanisms of nanofluids based on commercial engine oil loaded with graphite (Gt) and multiwalled carbon nanotubes, at different concentrations. The impedance spectroscopy technique was used to measure the resistance and capacity characterizing each sample in a frequency range 100 Hz–1 MHz and a temperature range 300–400 K. Two formalisms were used to analyze the data: (a) the electrical conductivity which has found to follow the Jonscher’s law with single and double exponents for carbon nanotube concentrations below and above the percolation threshold, respectively, and (b) the complex impedance that has permitted to identify the relaxation peaks according to the Cole–Cole model. Both the two formalisms showed that when the carbon nanotube concentration is higher than the percolation threshold, a positive temperature coefficient and a remarkable change in conductivity were observed, suggesting that the presence of the carbon nanotube greatly affect the electrical properties of the engine oil as a result of additional polarization effect induced by these nanoparticles. Furthermore, the analysis of the temperature dependence of dc conductivity and relaxation time using the Arrhenius equation indicated the addition of carbon nanotubes into engine oil increase the activation energies.

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