Abstract
Reduced graphene oxide-poly(3,4-ethylenedioxythiophene):p-toluene sulfonate (rGO-PEDOT:PTS) hybrid electrode films were synthesized directly on a substrate by interfacial polymerization between an oxidizing solid layer and liquid droplets of 3,4-ethylenedioxythiophene (EDOT) produced by electrospraying. The EDOT reduced the graphene oxide by donating electrons during its transformation into PEDOT:PTS, and hybrid films consisting of rGO distributed in a matrix of PEDOT:PTS were obtained. These rGO-PEDOT:PTS hybrid films showed excellent electrical conductivities as high as 1,500 S/cm and a sheet resistance of 70 Ω sq-1. The conductivity values are up to 50% greater than those of films containing conductive PEDOT:PTS alone. These results confirm that highly conductive rGO-PEDOT:PTS hybrid films can potentially be used as organic transparent electrodes.
Highlights
Transparent conductive electrode films, such as indium-tin oxide (ITO), have recently become the focus of considerable research due to their potential applications in optoelectronic devices, such as touch screens, liquid-crystal displays, organic light-emitting diodes (OLEDs), and thinfilm solar cells [1,2,3,4,5]
The PEDOT:PTS films hybridized with reduced graphene oxide (rGO) are obtained by interfacial polymerization between an Fe(III)-p-toluene sulfonate oxidizing solid layer and liquid droplets of EDOT produced by electrospraying
As revealed by the scanning electron microscopy (SEM) and atomic force microscopy (AFM) images, the rGOPEDOT:PTS hybrid films were composed of rGO sheets embedded in a conductive PEDOT:PTS matrix layer
Summary
Transparent conductive electrode films, such as indium-tin oxide (ITO), have recently become the focus of considerable research due to their potential applications in optoelectronic devices, such as touch screens, liquid-crystal displays, organic light-emitting diodes (OLEDs), and thinfilm solar cells [1,2,3,4,5]. PEDOT:PSS polymers have relatively good conductivity values of 500 to 1,000 S cm−1 [13,14,15], good electrochemical stability, moderate transparency, and good film-forming capabilities during solution processing. In previous publications [16,17], we reported highly conductive vapor phase-polymerized poly(3,4-ethylenedioxythiophene):p-toluene sulfonate (PEDOT:PTS) films with conductivities as high as 1,000 to 1,100 S cm−1 and transmittance up to 85% in OLED and liquid crystal devices. These conductivities are well below that of typical amorphous ITO (≈4,000 S cm−1), and the transmittance of the metallic PEDOT films was generally lower than that of ITO films
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