Graphene Oxide Sheets Combine into Conductive Coatings by Direct Oxidative Electropolymerization

Abstract

New coatings are obtained when graphene oxide is further oxidized at moderate anodic potentials (≤~1.3 V vs. Ag/AgCl). Based on a variety of spectroscopic and electrochemical observations, the coatings are attributed to the direct electropolymerization of graphene oxide sheets via oxidation of the phenol edge groups on graphene. Depending on the applied potential, ether or carboxylic groups are formed. The coatings obtained via further oxidation are characterized by a lower O/C ratio due to decarboxylation and a higher content of C=C bonds. These bonds extend aromatic conjugation into the combined graphene oxide sheets and are responsible for the highly conductive nature of these coatings.

Interfacial Chemistry‐Modified QD‐Coupled CdTe Solid Nanowire and Its Hybrid with Graphene Quantum Dots for Enhanced Photocurrent Properties

“…While the formation of GQDs is revealed by the peak at 284.6 eV corresponding to the graphitic carbon the existence of oxygen functional groups is observed from the peak at 288.6 eV and 290.3 eV corresponding to the (epoxy/ether) and O‐C=O groups. The raise of a small hump at 286.6 eV (Figure d) indicated the formation of C−O‐C bond for a sample prepared at 48 hrs reaction time. Photocurrent characterization of CdTe solid nanowire network and GQDs decorated CdTe solid nanowire network were investigated by implementing them in the following device structure; FTO/TiO 2 /(photosensitizer)/MoO 3 /Al, here the photosensitizer denotes the pure CdTe and CdTe with GQDs hybrid samples.…”

Enhancement of photoelectrochemical organics degradation and power generation by electrodeposited coatings of g-C3N4 and graphene on TiO2 nanotube arrays

“…This seems to indicate much thinner epGO coatings which is in accordance with our previous report (limited coating thickness of ∼30 nm on ITO electrodes) and the massive coatings with thickness of several micrometers as reported for erGO. 19 This is also reflected in the SEM images obtained for the two types of coatings. While thin films of epGO mostly covering the outer TiO 2 NT walls are observed for the TiO 2 NTs/epGO samples ( Fig.…”

“…17,18 Recently, we developed an alternative electrodeposition method, based upon anodic polarization of GO suspensions, which yields coatings obtained by EP of GO phenolic edge groups. 19 The high C]C bond content is responsible for the relatively high conductivity of these epGO coatings, which is within the same order of magnitude as that of the erGO one. 20 The EP method to obtain graphene coatings on anodized Ti seems more suitable than the one which uses cathodic polarization since the Fermi level of erGO is considered to be lower than the conduction band (CB) of TiO 2 .…”

Melamine-Based Nanocomposites for Selective Dopamine and Uric Acid Sensing

“…At present, Halevy et al combined graphene oxide sheets in a solution state into a conductive coating by direct oxidative electropolymerization. 23 Hou et al synthesized remarkable monolayer fullerene networks in the field of carbon materials. 24 Meanwhile, C 60 polymerization was further developed to prepare long-range ordered porous carbon.…”