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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2015

Evidence of monolayer formation from diazonium grafting with radical scavenger: electrochemical, AFM and XPS monitoring

Tony Breton
Eric Levillain
Thibaud Menanteau
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Résumé

This paper analyzes the impact of the use of a radical scavenger on organic films generated by aryldiazonium electrografting in terms of thickness, morphology and chemical composition. Glassy carbon (GC) and pyrolyzed photoresist films (PPFs) were modified by electrochemical reduction of 4-nitrobenzenediazonium salt in the presence of various amounts of 2,2-diphenyl-1-picrylhydrazyl (DPPH). The thicknesses of the organic films have been measured by atomic force microscopy (AFM) and the lower threshold values confirm that it is possible to reach a monolayer by radical trapping. X-ray photoelectron spectroscopy (XPS) highlights a decrease in the proportion of nitrophenyl groups grafted via azo bridges as the DPPH concentration decreases and the film thickness increases. A correlation of electrochemical, XPS and AFM data confirms that not all nitrophenyl groups are electroactive in films greater than 2 nm thick.

Domaines

Chimie
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Dates et versions

hal-01390960 , version 1 (02-11-2016)

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Citer

Tony Breton, Eric Levillain, Thibaud Menanteau, Alison Downard. Evidence of monolayer formation from diazonium grafting with radical scavenger: electrochemical, AFM and XPS monitoring. Physical Chemistry Chemical Physics, 2015, 17, pp.13137-13142. ⟨10.1039/C5CP01401H⟩. ⟨hal-01390960⟩
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