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| - Formation of Multilayers on Glassy Carbon Electrodes viathe Reduction of Diazonium Salts
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| - The functionalization of carbon electrodes with aryl films can be achieved via the electrochemical reductionof the corresponding diazonium salt. We have previously shown that this deposition procedure will producemultilayer films on ordered graphite under certain conditions. We examine here the formation of multilayerfilms on glassy carbon (GC) electrodes by potential step electrolysis of diazonium salts for longer periodsof time. The deposition of diethylaniline (DEA) is tracked with the use of infrared reflectance absorptionspectroscopy and scanning force microscopy. DEA is continually deposited over a 30 min potential stepand the film thickness approaches 20 nm. Phenylacetic acid and nitrophenyl films that are 15−25 nm thickcan also be deposited in this way. We also find that, despite the presence of a relatively thick DEA filmon a GC electrode, electron transfer to benchmark redox systems is not completely blocked. We attributethe compromised blocking to a high density of defects in the film structure.
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