“…After plasma treatment, these bands shows significant changes in shape, position, and intensity. More specifically, two very strong bands centered at 1342 and 1592 cm −1 apparently group the CC and CC bands, reflecting a very drastic change in the resonant structure of the polymer chains …”
The application of inert and insulating low density polyethylene (LDPE) in electrochemical detection is null. However, in a recent study it was found that reactive species formed onto the surface of plasma-treated LDPE and other polymers promote the electrocatalytic oxidation of dopamine. In this work, we examine the role of plasma-treated LDPE as mediator in enzymatic glucose biosensors based on Glucose oxidase and glass carbon substrate. Results indicate that plasma-induced changes facilitate the electrocommunication between the enzyme and the substrate. The chronoamperometric response of these sensors prove their bifunctionality since the oxidation of glucose to gluconolactone, which is catalyzed by the GOx, coexists with the oxidation of dopamine that is electrocatalytized by the plasma activated LDPE surface.
K E Y W O R D Scatalysis, glucose oxidase, inert polymers, poly(3,4-ethylenedioxythiophene), sensors
“…After plasma treatment, these bands shows significant changes in shape, position, and intensity. More specifically, two very strong bands centered at 1342 and 1592 cm −1 apparently group the CC and CC bands, reflecting a very drastic change in the resonant structure of the polymer chains …”
The application of inert and insulating low density polyethylene (LDPE) in electrochemical detection is null. However, in a recent study it was found that reactive species formed onto the surface of plasma-treated LDPE and other polymers promote the electrocatalytic oxidation of dopamine. In this work, we examine the role of plasma-treated LDPE as mediator in enzymatic glucose biosensors based on Glucose oxidase and glass carbon substrate. Results indicate that plasma-induced changes facilitate the electrocommunication between the enzyme and the substrate. The chronoamperometric response of these sensors prove their bifunctionality since the oxidation of glucose to gluconolactone, which is catalyzed by the GOx, coexists with the oxidation of dopamine that is electrocatalytized by the plasma activated LDPE surface.
K E Y W O R D Scatalysis, glucose oxidase, inert polymers, poly(3,4-ethylenedioxythiophene), sensors
“…An observable change has happened to the O1s peak. The band around 533 eV can be attributed to the C-O bond in PEDOT, whereas the peak at 531 eV can be assigned to S=O in the counterions (Madl et al., 2011, Kim et al., 2009, Park et al., 2014, Yan and Okuzaki, 2009). It can be concluded from the XPS and FTIR analyses that the MeOH-rinsed film contains only PEDOT and its counterions without residual reactants or oxidants.Figure 2Compositional Analysis of SSP PEDOT Film(A) XPS spectra (V2p) of V 2 O 5 and SSP PEDOT.(B) XPS spectra (S2p) of PH1000.(C) XPS spectra (S2p) of SSP PEDOT.…”
SummaryVarious in situ synthesis methods have been developed for the polymerization of 3,4-ethylenedioxythiophene monomers, such as electropolymerization, oxidative chemical vapor deposition, and vapor phase polymerization. Meeting industrial requirements through these techniques has, however, proven challenging. Here, we introduce an alternative method to fabricate highly conductive poly(3,4-ethylenedioxythiophene) (PEDOT) films in situ by solution means. The process involves sequential deposition of oxidants (V2O5 in this case) and monomers. Excess reactants and by-products can be completely removed from the PEDOT film by MeOH rinsing. The obtained PEDOT films possess good crystallinity and high doping level, with carrier concentration three orders of magnitude higher than that of the commercial product (PH1000, Heraeus GmbH). The electrical conductivity of the as-cast PEDOT film reaches up to 1,420 S/cm. In addition, this method is fully compatible with large-scale printing techniques. These PEDOT conducting films enable the realization of flexible touch sensors, which demonstrate superior flexibility and sensitivity.
“…The broad absorbance in the wavelength region around 600 and 650 nm corresponds to the peaks of PEDOT. 11,12 The absorbance of the PEDOT polymerized at 6 of the weight ratio between iron(III) p-toluenesulfonate hexahydrate-6 H 2 O and 3,4-ethylenedioxythiophene was the highest among the PEDOT polymerized at 5, 6, and 7 of weight ratios between iron(III) p-toluenesulfonate hexahydrate-6 H 2 O and 3,4-ethylenedioxythiophene (See Fig. 2), thus the amount of the PEDOT polymerized at 6 of the weight ratio between iron(III) p-toluenesulfonate hexahydrate-6 H 2 O and 3,4-ethylenedioxythiophene was the highest and then the capacitance was the highest (See Fig.…”
Carbon nanotubes (CNTs) which are directly grown on nanoporous alumina templates by chemical vapor deposition are modified by acid-treatment or/and annealing and then a negative electrode is obtained. Next, alumina is deposited onto the nanoporous alumina templates with the grown as well as modified CNTs by a chemical liquid phase deposition method and then a positive electrode is obtained. Finally, the negative electrode coated with solid electrolyte polymerized by changing weight ratios between iron(III) p-toluenesulfonate hexahydrate-6 H 2 O and 3,4-ethylenedioxythiophene is assembled with the positive electrode into an aluminum capacitor. The capacitance of the aluminum capacitor reaches a maximum at 6 of the weight ratio between iron(III) p-toluenesulfonate hexahydrate-6 H 2 O and 3,4-ethylenedioxythiophene. Furthermore, the highest capacitance as well as operation potential of the aluminum capacitor and the lowest leakage current density of the aluminum capacitor at the 10000th cycle of potential cycling are obtained by the CNTs being treated with acid and annealed. Moreover, the decreasing rates of the capacitance as well as operation potential of the aluminum capacitor and the increasing rate of the leakage current density of the aluminum capacitor for the raw CNTs are quicker than those for the CNTs treated with acid or/and annealed.
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