TY - GEN A1 - Lyutov, Vladimir V. A1 - Ivanov, Svetlozar D. A1 - Mirsky, Vladimir M. A1 - Tsakova, Vessela T. T1 - Polyaniline doped with poly(acrylamidomethylpropanesulphonic acid): electrochemical behaviour and conductive properties in neutral solutions T2 - Chemical Papers N2 - Poly(2-acrylamido-2-methyl-1-propanesulphonic acid) (PAMPSA)-doped polyaniline (PANI) layers are synthesised in the presence of sulphuric and perchloric acids. The effects of the inorganic acid as well as of the electrochemical synthetic procedure (potentiostatic and potentiodynamic deposition) and thickness of the polymer layers are studied. The focus is directed towards the pH dependence of the electrochemical redox activity and conductivity of the PAMPSA-doped PANI layers obtained under different conditions. Ascorbic acid oxidation is used as a test reaction to study the electrocatalytic behaviour of various PAMPSA-doped PANI layers in neutral solution. It is found that the type of inorganic component present in the polymerisation solution has a marked effect on the extent of doping in acidic solutions as well as on the redox electroactivity in neutral solutions. A comparison between potentiostatically and potentiodynamically synthesised layers at pH 7 shows a markedly lower conductance and lower extent of redox charge preservation in the case of potentiodynamic synthesis. The PANI electrocatalytic activity for ascorbic acid oxidation is also dependent on the polymer electrodeposition procedure, with potentiostatically synthesised layers exhibiting better electrocatalytic performance. KW - polyaniline KW - polyacids KW - PAMPSA KW - conductance KW - electrochemical Y1 - 2013 U6 - https://doi.org/10.2478/s11696-013-0341-9 SN - 1336-9075 VL - 67 IS - 8 SP - 1002 EP - 1011 ER - TY - GEN A1 - Tsakova, Vessela T. A1 - Ivanov, Svetlozar D. A1 - Lange, Ulrich A1 - Stoyanova, Aneliya A1 - Lyutov, Vladimir V. A1 - Mirsky, Vladimir M. T1 - Electroanalytical applications of nanocomposites from conducting polymers and metallic nanoparticles prepared by layer-by-layer deposition T2 - Pure and Applied Chemistry N2 - Layer-by-layer (LbL) deposition is a convenient technique for the formation of ultra-thin nanocomposite layers containing metallic nanoparticles (NPs) and conducting polymers (CPs). The advantages of this approach for producing composite layers suitable for electroanalytical applications are discussed. Examples of electroanalytical applications of LbL-deposited composites are presented. Composite layers consisting of polyaniline (PANI) and Pd NPs are used for hydrazine oxidation. The PANI–Au NPs system is applied for dopamine (DA) and uric acid (UA) oxidation. KW - conducting polymers KW - dopamine KW - electrochemistry KW - hydrazine KW - layer-by-layer deposition KW - nanoparticles KW - polyaniline (PANI) KW - uric acid Y1 - 2010 U6 - https://doi.org/10.1351/PAC-CON-10-08-01 SN - 1365-3075 VL - 83 IS - 2 SP - 345 EP - 358 ER - TY - GEN A1 - Lange, Ulrich A1 - Ivanov, Svetlozar D. A1 - Lyutov, Vladimir V. A1 - Tsakova, Vessela T. A1 - Mirsky, Vladimir M. T1 - Voltammetric and conductometric behaviour of self assembled multilayer nanocomposites of polyaniline and gold nanoparticles T2 - Journal of Solid State Electrochemistry N2 - Multilayer nanocomposites from polyaniline (PANI) and gold nanoparticles (AuNPs) were formed by layer-by-layer deposition. The formation of PANI–AuNPs multilayer structures was monitored by UV-vis absorption spectroscopy and cyclic voltammetry. Each deposited bilayer of PANI–AuNPs led to a monotonous and almost linear increase in both optical absorbance and the first current peak of PANI oxidation. The prepared multilayer nanocomposites were characterized by in situ conductivity measurements at different pH and potential and by transmission electron microscopy. Finally, chemosensitive properties of the new material based on the intrinsic affinity of gold nanoparticles were studied. Changes in the film resistance on exposure to vapors of mercury and sulfur-containing compounds were observed. KW - Polyaniline KW - Gold nanoparticles KW - Layer-by-layer deposition KW - Chemoresistor KW - In situ conductivity measurements KW - Nanocomposite Y1 - 2010 U6 - https://doi.org/10.1007/s10008-009-0922-2 SN - 1432-8488 SN - 1433-0768 VL - 14 IS - 7 SP - 1261 EP - 1268 ER -