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Article Dans Une Revue Langmuir Année : 2008

Functionalization of Glassy Carbon with Diazonium Salts in Ionic Liquids

Résumé

The paper reports on the chemical functionalization of glassy carbon electrodes with 4-bromobenzene (4-BBDT) and 4-(4′-nitrophenylazo)benzene diazonium tetrafluoroborate (4-NAB) salts in ionic liquids. The reaction was carried out at room temperature in air without any external electrical bias in either hydrophobic (1-butyl-3-methylimidazolium hexafluorophosphate) or hydrophilic (1-butyl-3-methylimidazolium methyl sulfate) ionic liquids. The resulting surfaces were characterized using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and electrochemical measurements. Electrochemical reduction of the terminal nitro groups allowed the determination of surface coverage and formation of an amine-terminated carbon surfaces. The results were compared to glassy carbon chemically modified in an aqueous solution in the presence of 1% sodium dodecyl sulfate (SDS) with the same diazonium salt. Furthermore, Raman spectroscopy coupled with electrochemical measurements allowed to distinguish between the reduction of -NO2 to -NH2 group and the -N=N- to -NH―NH- bond.

Dates et versions

hal-00386284 , version 1 (20-05-2009)

Identifiants

Citer

Paolo Actis, Guilain Caulliez, Galyna Shul, Marcin Opallo, Michel Mermoux, et al.. Functionalization of Glassy Carbon with Diazonium Salts in Ionic Liquids. Langmuir, 2008, 24 (12), pp. 6327-6333. ⟨10.1021/la703714a⟩. ⟨hal-00386284⟩
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