Faradaic impedance behaviour of oxidized and reduced poly (2,5-di-(2-thienyl)-thiophene) films

Electrical and Electrochemical Properties of Reduced, Oxidized, and Overoxidized Poly[2,5-di(-2-thienyl)-pyrrole] Films in Water/Acetonitrile Mixture

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Thin films of such materials can be usually electrogenerated from acetonitrile containing LiClO 4 as background electrolyte by cyclic voltammetry (CV), chronoamperometry (CA), and chronopotentiometry (CP). In the course of anodic electropolymerization, the polymer backbone is also oxidized to yield radical cation sites (polarons), which are compensated with anions coming from the electrolyte.…”

“…In the course of anodic electropolymerization, the polymer backbone is also oxidized to yield radical cation sites (polarons), which are compensated with anions coming from the electrolyte. Electron-spin resonance and spectral studies [7][8][9][10][11][12] have shown that polarons act as the main charge carriers conferring electrical conductivity of a semiconductor to these materials. The redox control of oxidized films produced at low anodic potentials, close to the beginning of electropolymerization, reveals that most polarons are electroactive and can be reversibly reduced with loss of counterions.…”

“…The redox control of oxidized films produced at low anodic potentials, close to the beginning of electropolymerization, reveals that most polarons are electroactive and can be reversibly reduced with loss of counterions. [9][10][11][12][13] The resulting reduced films then show so low a conductivity that they behave as electronic insulators. However, less is known about the properties of such polymers electrosynthesized at high anodic potentials.…”

“…22 The last procedure has been applied succesfully to characterize thin films of several insoluble conducting polymers, such as polyacetylene doped with alkali metals, 23 polypyrrole, 19,[24][25][26][27] polythiophenes, 28,29 and polyanilines. [28][29][30] In this way, we have previously studied 12 the faradaic impedance behavior of reduced and oxidized poly[2,5-di(-2-thienyl)-thiophene] [poly(SSS)] in 0.1 M LiClO 4 ϩ acetonitrile, but without overoxidation. Under these conditions, deposits show an increasing capacitance as electroactive polymer becomes more oxidized, along with high film resistances suggesting control of the corresponding oxidation-doping process by the transport of ClO 4 Ϫ counterions.…”

One saccharide sensor based on the complex of the boronic acid and the monosaccharide using electrochemical impedance spectroscopy

“…Among the various transduction techniques, electrochemical impedance spectroscopy is an effective method to probe the interfacial properties of modified electrode and often used for understanding chemical transformations and process associated with the conductive supports [22][23][24][25]. The dynamics of charge transfer at electrode interface are strongly influenced by the nature of the electrode surface and the structure of the electrical double layer [26].…”