“…These voltammograms show a highly reversible capacitive response at potentials more positive than −500 mV, which is characteristic of conducting polymers . The broad cathodic and anodic peaks between −0.20 and −0.3 V are likely associated with the uptake of protons by the polymer. , Since the polymer blends contain an immobilized polyanion which compensates the charge on the PEDOT, electroneutrality during the charging and discharging of PEDOT is maintained by the movement of protons in to and out of the polymer layer (eq 1). 3 Cyclic voltammetry at 20 mV s -1 of 30 μm thick (Nafion coated) PEDOT/PSS layers in 1 M H 2 SO 4 (aq): (A) M4, (B) Q1.…”
Section: Resultsmentioning
confidence: 99%
“…6 The broad cathodic and anodic peaks between -0.20 and -0.3 V are likely associated with the uptake of protons by the polymer. 20,21 Since the polymer blends contain an immobilized polyanion which compensates the charge on the PEDOT, electroneutrality during the charging and discharging of PEDOT is maintained by the movement of protons in to and out of the polymer layer (eq 1).…”
Poly(3,4-ethylenedioxythiophene)/poly(styrene-4-sulfonate) (PEDOT/PSS) composites have
been prepared from aqueous and aqueous acetonitrile solutions of EDOT and NaPSS by
oxidation using Fe(III) salts. Powders with PEDOT to PSS ratios ranging from 0.3 to 4.2
and electronic conductivities as high as 10 S cm-1 have been obtained in good yields. The
PEDOT/PSS blends are cation exchangers and exhibit facile eletrochemistry in both aqueous
and acetonitrile media. Impedance measurements have shown that 30 μm thick PEDOT/PSS layers have proton conductivities as high as 0.03 S cm-1.
“…These voltammograms show a highly reversible capacitive response at potentials more positive than −500 mV, which is characteristic of conducting polymers . The broad cathodic and anodic peaks between −0.20 and −0.3 V are likely associated with the uptake of protons by the polymer. , Since the polymer blends contain an immobilized polyanion which compensates the charge on the PEDOT, electroneutrality during the charging and discharging of PEDOT is maintained by the movement of protons in to and out of the polymer layer (eq 1). 3 Cyclic voltammetry at 20 mV s -1 of 30 μm thick (Nafion coated) PEDOT/PSS layers in 1 M H 2 SO 4 (aq): (A) M4, (B) Q1.…”
Section: Resultsmentioning
confidence: 99%
“…6 The broad cathodic and anodic peaks between -0.20 and -0.3 V are likely associated with the uptake of protons by the polymer. 20,21 Since the polymer blends contain an immobilized polyanion which compensates the charge on the PEDOT, electroneutrality during the charging and discharging of PEDOT is maintained by the movement of protons in to and out of the polymer layer (eq 1).…”
Poly(3,4-ethylenedioxythiophene)/poly(styrene-4-sulfonate) (PEDOT/PSS) composites have
been prepared from aqueous and aqueous acetonitrile solutions of EDOT and NaPSS by
oxidation using Fe(III) salts. Powders with PEDOT to PSS ratios ranging from 0.3 to 4.2
and electronic conductivities as high as 10 S cm-1 have been obtained in good yields. The
PEDOT/PSS blends are cation exchangers and exhibit facile eletrochemistry in both aqueous
and acetonitrile media. Impedance measurements have shown that 30 μm thick PEDOT/PSS layers have proton conductivities as high as 0.03 S cm-1.
“…The cathodic peak at ca. −0.20 V during the first scan can be assigned to the uptake of protons by the polymer. , Since the PPy/PSS layer contains immobile polyanions and was separated from an acid electrolyte solution by a Nafion film, which is impermeable to anions, protons are the only charge-compensating ion that are likely to be involved. 6 Cyclic voltammograms of PPy/PSS sample 1.…”
Size control of polypyrrole particles prepared by chemical
polymerization was achieved
by varying the concentration of the oxidant in the presence of
poly(styrenesulfonate). At
higher concentrations, smaller polypyrrole particles are formed.
Poly(styrenesulfonate)
functions as a molecular template, causing local preconcentration of
both pyrrole and Fe3+.
These increased local concentrations result in faster nucleation
and polymerization, which
favors the formation of small particles. Average particle sizes
ranging from ca. 40 nm to 1
μm have been obtained.
“…It has been reported that the expansion and contraction of conjugated polymers including polypyrrole vary depending on several factors such as mobility of dopant ions, solvent, pH, or the history of applied voltage. 11,[22][23][24] The efficiency of converting electrical energy to mechanical energy for polypyrrole has been estimated. 25 Dimensional change in carbon materials at applying voltage has also been observed for composite materials such as the bucky paper actuator 14 or the bucky-gel actuator.…”
Articles you may be interested inStability of deflected-beam metal-insulator-metal tunneling cathodes under high acceleration voltageThe authors developed a scheme for characterizing the expansion and contraction of polymer electrodes when voltage is applied by coupling a symmetry analysis, the elasticity theory, and the experimental measurements. This scheme was applied to the bucky-gel electrodes and the expansion and contraction rates for the cathode and the anode were determined separately. For the case of the bucky-gel electrodes, it was found that the cathode expands and the anode contracts as voltage is applied. The stress exerted inside the electrode layers was also determined and the mechanical efficiency of the actuator composed of the bucky-gel electrodes is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
