Hyphenated in situ conductance and spectroelectrochemical studies of polyaniline films in strongly acidic solutions

2013 ◽  
Vol 110 ◽  
pp. 446-451 ◽  
Author(s):  
Péter S. Tóth ◽  
Gergely F. Samu ◽  
Balázs Endrődi ◽  
Csaba Visy
Keyword(s):  
Acidic Solutions ◽  
Polyaniline Films

In Situ ATR-IR Observation of the Electrochemical Oxidation of a Polycrystalline Boron-Doped Diamond Electrode in Acidic Solutions

2018 ◽  
Vol 122 (48) ◽  
pp. 27456-27461 ◽  
Author(s):  
Taiga Ogose ◽  
Seiji Kasahara ◽  
Norihito Ikemiya ◽  
Nagahiro Hoshi ◽  
Yasuaki Einaga ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Boron Doped Diamond ◽  
Acidic Solutions ◽  
Diamond Electrode ◽  
Boron Doped ◽  
Boron Doped Diamond Electrode

scholarly journals Poly(3,4-ethylenedioxythiophene) Electrosynthesis in the Presence of Mixtures of Flexible-Chain and Rigid-Chain Polyelectrolytes

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3866
Author(s):  
Varvara Kabanova ◽  
Oxana Gribkova ◽  
Alexander Nekrasov
Keyword(s):  
Additive Effect ◽  
Potential Cycling ◽  
Flexible Chain ◽  
Chain Component ◽  
Ammonia Sensing ◽  
Rigid Chain ◽  
Vis Spectroscopy ◽  
Polyaniline Films ◽  
Spectroelectrochemical Properties

The electrochemical synthesis of poly(3,4-ethylenedioxythiophene) (PEDOT) was first carried out in the presence of mixtures of flexible-chain and rigid-chain polyacids and their Na-salts. Earlier on with the example of polyaniline, we have shown the non-additive effect of the rigid-chain component of polyacid mixtures on the electrodeposition of polyaniline films, their morphology and spectroelectrochemical properties. In this study, we confirmed the non-additive effect and showed that such mixed PEDOT–polyelectrolyte films possess unique morphology, spectroelectrochemical and ammonia sensing properties. The electrosynthesis was carried out in potential cycling, galvanostatic and potentiostatic regimes and monitored by in situ UV–Vis spectroscopy. UV–Vis spectroelectrochemistry of the obtained PEDOT–polyelectrolyte films revealed the dominating influence of the rigid-chain polyacid on the electronic structure of the mixed complexes. The mixed PEDOT–polyacid films demonstrated the best ammonia sensing performance (in the range of 5 to 25 ppm) as compared to the films of individual PEDOT–polyelectrolyte films.

Electrical properties and conduction mechanism of in situ HCl-doped emeraldine salt polyaniline films deposited on n-ZnS/p-Si(100)

2018 ◽  
Vol 5 (7) ◽  
pp. 15180-15185
Author(s):  
Kathrina P. Gumahad ◽  
Reynaldo M. Vequizo ◽  
Majvell Kay G. Odarve-Vequizo ◽  
Bianca Rae B. Sambo-Fabricante
Keyword(s):  
Electrical Properties ◽  
Conduction Mechanism ◽  
Emeraldine Salt ◽  
Polyaniline Films

Structure and stability of thin polyaniline films deposited in situ on silicon and gold during precipitation and dispersion polymerization of aniline hydrochloride

2011 ◽  
Vol 519 (18) ◽  
pp. 5933-5941 ◽  
Author(s):  
Zuzana Rozlívková ◽  
Miroslava Trchová ◽  
Ivana Šeděnková ◽  
Milena Špírková ◽  
Jaroslav Stejskal
Keyword(s):  
Dispersion Polymerization ◽  
Aniline Hydrochloride ◽  
Structure And Stability ◽  
Polyaniline Films

The local structure of Ta(v) aqua ions in high temperature fluoride- and chloride-bearing solutions: Implications for Ta transport in granite-related postmagmatic fluids

2019 ◽  
Vol 57 (6) ◽  
pp. 843-851
Author(s):  
Alan J. Anderson ◽  
Robert A. Mayanovic ◽  
Thomas Lee
Keyword(s):  
High Temperature ◽  
Local Structure ◽  
Elevated Temperatures ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Acidic Solutions ◽  
Diamond Anvil ◽  
X Ray Absorption ◽  
Photon Source

Abstract The local structure of Ta(V) in high-temperature fluoride- and chloride-bearing acidic solutions was investigated using in situ X-ray absorption spectroscopy (XAS). All XAS spectra were collected from two solutions, designated A and B, at beamline ID-20-C at the Advanced Photon Source, Argonne National Laboratory. Spectra were collected from solution A at 350 and 400 °C and from solution B at 25, 360, and 400 °C after the solutions were sealed in a hydrothermal diamond anvil cell. Solution A was prepared by dissolving Ta2O5 powder in 5% HF solution; solution B consisted of TaCl5 dissolved in 2% HF. The dominant tantalum species in solution A at elevated temperatures was TaF83–. In contrast, TaCl6–, which was the dominant complex in solution B at room temperature, disappeared as hydroxide complexes with an average ligand number between 5 and 7 became the dominant species at 350 and 400 °C. The XAS results confirm the previously recognized effect of fluoride activity on Ta speciation in hydrothermal fluids and suggest that both fluoride and hydroxide complexes play an important role in the transport of Ta in acidic fluoride-bearing solutions involved in the formation of mineralized mica-rich replacement units in granitic pegmatites.

Morphology and gas-sensing behavior of in situ polymerized nanostructured polyaniline films

2006 ◽  
Vol 42 (10) ◽  
pp. 2730-2735 ◽  
Author(s):  
Shuangxi Xing ◽  
Chun Zhao ◽  
Shengyu Jing ◽  
Yan Wu ◽  
Zichen Wang
Keyword(s):  
Gas Sensing ◽  
Polyaniline Films

Infrared Spectroscopic Studies of Thin Polyaniline Films

1990 ◽  
Vol 210 ◽  
Author(s):  
Carol Korzeniewski ◽  
David M. Seeger
Keyword(s):  
Spectroscopic Study ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic Study ◽  
Infrared Spectroscopic ◽  
Polyaniline Films

AbstractThe electrochemistry of polyaniline depends upon the pH of the deposition solution and the nature of the anion present during deposition. When the pH of the deposition solution is below 1.0, the response is typical of the para-substituted phenyleneamine structure. When the pH of the deposition solution is greater than 1.0, an additional voltammetric wave appears, and the response is a function of the dopant anion. This report presents results of an in situ infrared spectroscopic study aimed at elucidating structural features which determine the anion dependent voltammetric response.

In situ formation of molecular-scale ordered polyaniline films by zinc coordination

Nanoscale ◽  
2017 ◽  
Vol 9 (19) ◽  
pp. 6545-6550 ◽  
Author(s):  
Hong-Joon Lee ◽  
Sang-Ook Hur ◽  
Min-Kyoon Ahn ◽  
Mohammad Changez ◽  
Jae-Suk Lee
Keyword(s):  
Molecular Scale ◽  
Polyaniline Films ◽  
Zinc Coordination ◽  
In Situ Formation
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