Spontaneous adsorbed layers of 4-nitrobenzenediazonium salt on gold and glassy carbon: Local characterization by SECM and electron-transfer kinetics evaluation

The adsorption of 4-nitrobenzenediazonium tetrafluoroborate (NBD) in acidic aqueous solution was investigated by scanning electrochemical microscopy (SECM) on polycrystalline gold and glassy carbon (GC) substrates. The feedback mode of SECM was used to study the local properties of each substrate be...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2010-08, Vol.647 (1), p.93-96
Main Authors: Griveau, Sophie, Aroua, Safwan, Bediwy, Dina, Cornut, Renaud, Lefrou, Christine, Bedioui, Fethi
Format: Article
Language:English
Subjects:
Adsorption
Aryldiazonium adsorption
Chemistry
Electrochemistry
Electron-transfer kinetics
Exact sciences and technology
General and physical chemistry
Scanning electrochemical microscopy
Study of interfaces
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Summary:The adsorption of 4-nitrobenzenediazonium tetrafluoroborate (NBD) in acidic aqueous solution was investigated by scanning electrochemical microscopy (SECM) on polycrystalline gold and glassy carbon (GC) substrates. The feedback mode of SECM was used to study the local properties of each substrate before and after immersion in the aryldiazonium solution, by performing approach curves with two redox mediators, Fe ( CN ) 6 4 - and Ru ( NH 3 ) 6 3 + . The fitting of the approach curves with analytical approximate equation was used to evaluate the apparent heterogeneous rate constant k for Fe ( CN ) 6 3 - / 4 - redox system at NBD-adsorbed GC ( k = 2.6 × 10 −4 cm s −1).
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2010.05.014