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Morphological Changes in Electrografted Aryl‐Based Thin Films Induced by using Diazonium Salts or Aryl Iodides
Author(s) -
González Miriam C. Rodríguez,
Carro Pilar,
Hernández Creus Alberto
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701237
Subject(s) - aryl , nitrobenzene , electrochemistry , highly oriented pyrolytic graphite , pyrolytic carbon , chemistry , iodide , adsorption , ferrocyanide , ferricyanide , diazonium compounds , redox , molecule , polymer chemistry , materials science , inorganic chemistry , graphite , electrode , organic chemistry , alkyl , pyrolysis , catalysis
A comparative study of the growth of electrografted films on highly oriented pyrolytic graphite (HOPG) when using aryl iodides and aryl diazonium salts is reported. Films were generated under potentiostatic control by using 1‐iodo‐4‐nitrobenzene (INB) and 4‐nitrobenzene diazonium (NBD). To check the charge‐transfer properties of the modified electrodes, ferrocyanide/ferricyanide and dopamine were used as electrochemical redox probes. Atomic force microscopy was used to characterize the morphology of both systems at the nanoscale. Our results show that, despite the electrografting reaction for both molecules being based on the formation of an aryl radical and its subsequent anchorage on the HOPG surface, the required electrochemical conditions and the sub‐product generated for each species determine the properties and morphology of the films at the nanoscale. Theoretical results obtained through DFT calculations show the role of the adsorption of different products when an aryl iodide is used, which determines the morphology of the electrografted films.