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Functionalization of Carbon Materials by Reduction of Diazonium Cations Produced in Situ in a Brønstedt Acidic Ionic Liquid
Author(s) -
Carvalho Padilha Janine,
Noël JeanMarc,
Bergamini JeanFrançois,
RaultBerthelot Joëlle,
Lagrost Corinne
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500434
Subject(s) - ionic liquid , carbon nanotube , surface modification , electrochemistry , materials science , raman spectroscopy , carbon fibers , graphite , glassy carbon , chemical engineering , electrolysis , diazonium compounds , ionic bonding , nitrobenzene , inorganic chemistry , electrode , chemistry , nanotechnology , electrolyte , organic chemistry , cyclic voltammetry , ion , catalysis , composite material , composite number , physics , optics , engineering
The imidazolium‐based acidic ionic liquid 1‐butyl‐3‐methylimidazolium hydrogensulfate, [BMIm][HSO 4 ], is used for the grafting of carbon materials, allowing the nitrobenzene diazonium cations to be simply produced in situ. An appealing self‐limiting and self‐patching process occurs in this viscous ionic liquid. Even for low electrolysis charge consumption, the layers are particularly dense and compact at atomic force microscopy resolution. The grafting method is further extended to carbon nanotubes, following either an electrochemical or a chemical route. A bucky paste is easily obtained from [BMIm][HSO 4 ] and carbon nanotubes that could coat a graphite electrode surface. This simple soft method allows: 1) in situ electrografting of carbon nanotubes in [BMIm][HSO 4 ] and/or 2) easy‐to‐handle electrochemical characterizations of the functionalized carbon nanotubes. The covalent functionalization of single‐walled carbon nanotubes is further assessed by Raman spectroscopy.