Doping of graphene via adlayer formation of electrochemically reduced dibenzyl viologen

Abstract

Doping of graphene by self-assembled molecular network of uncharged dibenzyl viologen (DBV0) generated in situ.

Surface Engineering of Graphite and Graphene by Viologen Self-Assembling: From Global to Local Architectures

“…This report provided direct evidence of a change in the work function of viologen-doped graphene . Recently, we demonstrated that the doping degree of CVD graphene on SiO 2 is modulated by the uncharged DBV 0 molecules, electrochemically generated . In addition, the neutral form of DBV was successfully used to modulate the charge transfer and band gap of MoS 2 and bilayer graphene, respectively …”

“…(a) CVs of HOPG and G-Cu in 50 mM HCl (black and gray curves) and in 0.1 mM DBV 2+ + 50 mM HCl (red and blue curves). The colored bars illustrate the regimes where a particular DBV-species is the dominant one: green: DBV 2+ , orange: DBV •+ , purple: DBV 0 , and pink: transient regime; (b) the redox processes of DBV show the transformation between dicationic, monocationic, and uncharged molecules upon capturing/releasing electrons (reproduced from ref with permission from the Royal Society of Chemistry).…”

Covalent Molecular Anchoring of Metal-Free Porphyrin on Graphitic Surfaces toward Improved Electrocatalytic Activities in Acidic Medium

“…Non-covalent functionalization of electrode surfaces has been employed for designing these types of heterogeneous catalysts [4,29,[32][33][34]. Compared with other approaches, this approach dealing with two-dimensional (2D) materials including carbon-basedas well as transition metal dichalcogenides(TMDs)materials has been intensively focused on due to theintrinsic properties of the latter materials, including distinct thickness-dependent optoelectronic properties, large surface areas, and enormous experimental charge mobilities that facilitate the electrocatalytic activities [35][36][37][38][39]. In particular, a molecular approach to investigate the electrocatalytic HER process of a twodimensional system consisting of catalytically active porphyrin molecules and atomically thin graphene electrodes was also conducted in order to verify the HER mechanism at the molecular scale [40].…”

On the role of functional groups in the formation of diazonium based covalent attachments: dendritic vs. layer-by-layer growth

“…9,10 So far, two parallel approaches have been applied to modify the graphene surface: physisorption and chemisorption. [11][12][13][14][15][16][17][18] For physisorption, organic molecules randomly adsorb or selfassemble onto the graphene surface via weak intermolecular interactions, thereby preserving the intrinsic properties of graphene. However, these systems are usually not robust, which may limit stability against temperature and other environmental changes.…”