Time-of-Flight Secondary Ion Mass Spectroscopy Characterization of the Covalent Bonding between a Carbon Surface and Aryl Groups

Abstract

Grafting of aryl layers derived from aryl diazonium salts onto glassy carbon electrodes is observed by time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The grafting occurs spontaneously when a glassy carbon plate is immersed into a solution of aryl diazonium salt and can be enhanced by biasing the carbon plate at a potential a little more negative than the diazonium salt reduction. C-C and C-O covalent bonding are believed to be responsible for the strong attachment of these layers onto the carbon substrate. Fragments containing aryl dimers, trimers, or tetramers are also observed. A mechanism is proposed to account for the formation of these polymeric chains.

Attractive double-layer forces and charge regulation upon interaction between electrografted amine layers and silica

“…However, unlike the unmodified GC, the GC-PEA surface contains small globular domains that are most clearly seen in air. We assign these to clusters of PEA that are formed due to less rapid reactions between radicals and the GC surface compared to reactions with already grafted PEA [46,61].…”

Radical grafting of carbon surfaces with alkylic groups by mediated oxidation of carboxylates

“…organic groups whose binding mode has been considered to be covalent in nature [30,31]. The electrode inhibition process was also observed with reversible ferrocene derivatives possessing different redox potentials such as ferrocenemeth-…”

Oxygen electroreduction on chemically modified glassy carbon electrodes in alkaline solution

“…Glassy carbon (GC) [1,4,[6][7][8][9][10][11][12][13][14][15][16][17][18][19], highly oriented pyrolytic graphite (HOPG) [4,6,20,21], boron-doped diamond (BDD) [21][22][23], carbon nanotubes (CNT) [24,25] and other carbon materials have been successfully grafted using the diazonium reduction method. A large variety of surface modifiers can be attached to carbon surfaces.…”