Effect of incorporation of ethylene glycol into PEDOT:PSS on electron phonon coupling and conductivity

Abstract

The effect of incorporation of ethylene glycol (EG) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on electron phonon coupling and conductivity is investigated. It is shown that the carrier density (NC) increases significantly and the carrier mobility (μ) increases slightly at 300 K. The increased intensity of the Raman spectrum between 1400 and 1450 cm−1, following EG treatment (that is, the quinoid-dominated structures of the PEDOT chain), leads to an increase in the number of polarons (bipolarons), which leads to an increase in NC. In addition, μ in PEDOT:PSS samples with or without EG addition exhibits a strong temperature dependence, which demonstrates the dominance of tunneling (hopping) at low (high) temperatures. The high conductivity of PEDOT:PSS samples with the addition of EG is attributed to the combined effect of the modification of the electron-phonon coupling and the increase in NC (μ).

Enhancement of thermoelectric performance of PEDOT:PSS films by post-treatment with a superacid

“…The van der Pauw–Hall measurements was tested on a polycrystalline bar-shaped ingot with four cold-pressed in contacts (one on each side of the ingot) positioned in a standard Hall geometry. 41 The pristine PEDOT:PSS film shows a lowest carrier concentration at room temperature of n with 3.86 ± 0.12 × 10 18 cm −3 , indicative of p-type conduction and consistent with the positive Seebeck coefficient. The calculated conductivity was 0.69, 851, 898, 2738 S cm −1 for pristine, mixing with 5% DMSO, methanol post-treatment and TFMS–MeOH post-treatment, respectively.…”

“…In addition, carrier concentration ( n ) increases significantly and mobility ( μ ) increases slightly after treatment. It is implied that the incorporation of prior results in the removal of the insulating PSS parts from PEDOT:PSS thin films, 41,44,45 Table 2 summarizes the thermoelectric properties of PEDOT:PSS nanothin film measured before and after TFMS–MeOH treatment, including the Seebeck coefficient, electrical conductivity, power factor, thermal capacity, thermal diffusivity, and thermal conductivity. Similar to the Seebeck coefficient, the thermal conductivity of PEDOT:PSS was not much affected by the increase in electrical conductivity.…”

All-polymeric transient neural probe for prolonged in-vivo electrophysiological recordings

“…PEDOT:PSS dispersed in water is commercially available, has excellent biocompatibility, has the ability to support cells viability [27,28], and can be integrated into softer systems like elastomers [29,30] and hydrogels [31,32]. EG doping of PEDOT:PSS is known to improve its conductivity [33,34]. The micro-structured PCL-based substrate (thickness 60 to 70 µm) and encapsulation (thickness 60 to 70 µm) layers were obtained by replica moulding.…”

Electrostatic Self-Assembly of Composite Nanofiber Yarn

“…This method puts away mechanical components for twisting motion, but triggers the twisting using a current electrospinning system. Furthermore, the introduction of EG enhances the CNC/PVA/PEDOT:PSS composite conductivity, reducing the required applied electric field [27].…”