scholarly journals Electrical Conductivity Studies of Polyaniline Nanotubes Doped with Different Sulfonic Acids

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Mohd. Khalid ◽  
Milton A. Tumelero ◽  
Iuri. S. Brandt ◽  
Vinicius C. Zoldan ◽  
Jose J. S. Acuña ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cyclic Voltammetry ◽  
Oxidative Polymerization ◽  
Sulfonic Acids ◽  
Camphorsulfonic Acid ◽  
Ammonium Peroxydisulfate ◽  
Toluenesulfonic Acid ◽  
Sem And Tem ◽  
Self Assembled ◽  
Polyaniline Nanotubes

Self-assembled polyaniline (PANI) nanotubes were prepared in the presence of three different sulfonic acids as dopant, namely, p-toluenesulfonic acid, camphorsulfonic acid, and tetrakis(4-sulfonatophenyl)porphyrin, by oxidative polymerization using ammonium peroxydisulfate as the oxidant. The morphology of the PANI nanotubes was determined by SEM and TEM and the electrical conductivity was measured as a function of temperature. The PANI nanotubes were also characterized by FTIR, XRD, UV-Vis, and cyclic voltammetry. We have found that the dopants had a noteworthy effect on the electrical conductivity whithout significant changes in the morphology of the PANI nanotubes.

scholarly journals Role of the Anilinium Ion on the Selective Polymerization of Anilinium 2-Acrylamide-2-methyl-1-propanesulfonate

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2349
Author(s):  
Alain Salvador Conejo-Dávila ◽  
Marco Armando Moya-Quevedo ◽  
David Chávez-Flores ◽  
Alejandro Vega-Rios ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Cyclic Voltammetry ◽  
Optical Properties ◽  
Thermal Properties ◽  
Free Radical ◽  
1H Nmr ◽  
Molecular Interactions ◽  
13C Nmr ◽  
Oxidative Polymerization ◽  
Cyclic Voltammetry Analysis

The development of anilinium 2-acrylamide-2-methyl-1-propanesulfonate (Ani-AMPS) monomer, confirmed by 1H NMR, 13C NMR, and FTIR, is systematically studied. Ani-AMPS contains two polymerizable functional groups, so it was submitted to selective polymerization either by free-radical or oxidative polymerization. Therefore, poly(anilinium 2-acrylamide-2-methyl-1-propanesulfonic) [Poly(Ani-AMPS)] and polyaniline doped with 2-acrylamide-2-methyl-1-propanesulfonic acid [PAni-AMPS] can be obtained. First, the acrylamide polymer, poly(Ani-AMPS), favored the π-stacking of the anilinium group produced by the inter- and intra-molecular interactions and was studied utilizing 1H NMR, 13C NMR, FTIR, and UV-Vis-NIR. Furthermore, poly(Ani-AMPS) fluorescence shows quenching in the presence of Fe2+ and Fe3+ in the emission spectrum at 347 nm. In contrast, the typical behavior of polyaniline is observed in the cyclic voltammetry analysis for PAni-AMPS. The optical properties also show a significant change at pH 4.4. The PAni-AMPS structure was corroborated through FTIR, while the thermal properties and morphology were analyzed utilizing TGA, DSC (except PAni-AMPS), and FESEM.

Polyaniline nanotubes with rectangular-hollow-core and its self-assembled surface decoration: high conductivity and dielectric properties

RSC Advances ◽  
2014 ◽  
Vol 4 (24) ◽  
pp. 12342-12352 ◽  
Author(s):  
Pradip Paik ◽  
Ramesh Manda ◽  
Chander Amgoth ◽  
K. Santhosh Kumar
Keyword(s):  
Dielectric Properties ◽  
High Conductivity ◽  
Hollow Core ◽  
Electrical And Dielectric Properties ◽  
Surface Decoration ◽  
Self Assembled ◽  
Polyaniline Nanotubes

Self-assembled and surface decorated PANI nanotubes with rectangular hallow core with high electrical and dielectric properties.

scholarly journals Preparation and Thermoelectric Properties of Graphite/poly(3,4-ethyenedioxythiophene) Nanocomposites

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2849 ◽  
Author(s):  
Yong Du ◽  
Haixia Li ◽  
Xuechen Jia ◽  
Yunchen Dou ◽  
Jiayue Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Oxidative Polymerization ◽  
Polymerization Process ◽  
Measurement Temperature ◽  
Temperature Range ◽  
Different Content

Graphite/poly(3,4-ethyenedioxythiophene) (PEDOT) nanocomposites were prepared by an in-situ oxidative polymerization process. The electrical conductivity and Seebeck coefficient of the graphite/PEDOT nanocomposites with different content of graphite were measured in the temperature range from 300 K to 380 K. The results show that as the content of graphite increased from 0 to 37.2 wt %, the electrical conductivity of the nanocomposites increased sharply from 3.6 S/cm to 80.1 S/cm, while the Seebeck coefficient kept almost the same value (in the range between 12.0 μV/K to 15.1 μV/K) at 300 K, which lead to an increased power factor. The Seebeck coefficient of the nanocomposites increased from 300 K to 380 K, while the electrical conductivity did not substantially depend on the measurement temperature. As a result, a power factor of 3.2 μWm−1 K−2 at 380 K was obtained for the nanocomposites with 37.2 wt % graphite.

scholarly journals NaFePO4 Cathode Prepared from The Caustic Fusion of A Mix Ilmenite-Hematite Followed by Cyclic Voltammetry for Na Insertion

2020 ◽  
Vol 9 (2) ◽  
pp. 142-152
Author(s):  
Fitria Rahmawati ◽  
◽  
Dwi Aman Nur Romadhona ◽  
Syulfi Faiz ◽  
◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cyclic Voltammetry ◽  
Secondary Phase ◽  
Impedance Analysis ◽  
Fusion Method ◽  
Peak Point ◽  
Fe Content ◽  
Scan Rate ◽  
Hematite Fe2o3 ◽  
Resistance Value

Research to prepare NaFePO4 cathode material from iron sand was conducted. The iron sand consists of ilmenite FeTiO3 and hematite Fe2O3. A caustic fusion method used to precipitate iron as Fe(OH)3 and it increased Fe content up to 94.71 %. Phosphate precipitation successfully produced trigonal FePO4 and monoclinic FePO4 comply with ICSD#412736 and ICSD#281079. The prepared-FePO4 was then used as a precursor for Na insertion by applying cyclic voltammetry mode within 2.0 – 4.0 V with 0.05 mVs-1 of the scan rate. It produced orthorhombic olivine NaFePO4 and a secondary phase of orthorhombic Na0.7FePO4. Impedance analysis at 20 Hz – 5 MHz found that the material provided a semicircle at 100 Hz peak point, indicating electrode-bulk interface with a resistance value of 1735W, comparable to the electrical conductivity of 5.36 x 10-6 Scm-1. Even though the conductivity value is quite lower than NaFePO4 prepared from a commercial FePO4 that has been conducted in our previous research, however the electrical conductivity still reliable for cathode.

Synthesis and Characterization of Self-Assembled Polyaniline Nanotubes/Silica Nanocomposites

2009 ◽  
Vol 113 (20) ◽  
pp. 7116-7127 ◽  
Author(s):  
Gordana Ćirić-Marjanović ◽  
Ljiljana Dragičević ◽  
Maja Milojević ◽  
Miloš Mojović ◽  
Slavko Mentus ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Silica Nanocomposites ◽  
Self Assembled ◽  
Polyaniline Nanotubes

scholarly journals Influence of Acidity and Oxidant Concentration on the Nanostructures and Electrochemical Performance of Polyaniline during Fast Microwave-Assisted Chemical Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 310 ◽  
Author(s):  
Biwei Qiu ◽  
Jingyun Wang ◽  
Zhoujing Li ◽  
Xia Wang ◽  
Xiaoyan Li
Keyword(s):  
Electrical Conductivity ◽  
Electrochemical Performance ◽  
Oxidative Polymerization ◽  
Molecular Structures ◽  
Chain Growth ◽  
Acidic Solutions ◽  
Microwave Assisted ◽  
Oxidant Concentration ◽  
Weakly Acidic Solution ◽  
Hcl Concentration

Polyaniline (PANI), a typical conducting polymer, has attracted great interest as an electrode material. A series of PANIs were prepared through fast microwave-assisted chemical oxidative polymerization with varying HCl and APS concentrations here. It was found that the microwave synthesized PANIs had ~4 times higher for the yields and 7~10 times higher for the electrical conductivity in comparison to PANI samples prepared using conventional method. PANI nanosheets could easily be fabricated in weakly acidic solution due to their oligomeric structure, which contained flat phenazine rings. By contrast, linear PANI chains produced in highly acidic solutions formed nanofibers. The APS concentration did not significantly affect the molecular structures of PANIs under the conditions here. However, increasing the concentration of APS produced nanofibers with shorter branches, which may be due to secondary nucleation during chain growth resulting from increases in active initiation centers. The electrical conductivity and electrochemical performance of PANIs were both improved with increasing HCl and APS concentrations. Improvements due to increases in HCl concentration may be attributed to additions in conjugation length and enrichment of doping levels, while improvements due to increases in APS concentration could be attributed to the increased crystallinity of PANI, which facilitates ion transport.

Photochromic dithienylethenes characterized by in situ irradiation NMR-spectroscopy and electrochemically induced responsiveness on gold substrates

2019 ◽  
Vol 7 (45) ◽  
pp. 14088-14097
Author(s):  
Jonas von Irmer ◽  
Florian Frieß ◽  
Dominik Herold ◽  
Jonas Kind ◽  
Christina M. Thiele ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Nmr Spectroscopy ◽  
Self Assembled Monolayers ◽  
Gold Surfaces ◽  
Gold Substrates ◽  
Assembled Monolayers ◽  
Self Assembled

The photochromic and electrochemical switching capabilities of two dithienylethenes with different substitutions and their self-assembled monolayers on gold surfaces are characterized by in situ NMR-spectroscopy and cyclic voltammetry.

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