Highly stable ECL active films formed by the electrografting of a diazotized ruthenium complex generated in situ from the amine
Date
2011
Authors
Piper, D.J.E.
Barbante, G.J.
Brack, N.
Pigram, P.J.
Hogan, C.F.
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Journal article
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Langmuir, 2011; 27(1):474-480
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Abstract
The electrodeposition of the electrochemiluminescent (ECL) ruthenium complex, bis(2,2'-bipyridyl)(4'-(4-aminophenyl)-2,2'- bipyridyl)ruthenium(II), [Ru(bpy)2(apb)]2+, via the in situ formation of a diazonium species from aqueous media is reported. Surface characterization undertaken using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) determined that the layer is bound to the substrate via azo bonding. The layer displays good ECL activity and is stable over a long period of time. The excellent potential of this system for ECL sensing applications is demonstrated using the well-known ECL coreactant 2-(dibutylamino)ethanol (DBAE) as a model analyte, which can be detected to a level of 10 nM with a linear range between 10-8 and 10-4 M.
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Copyright 2010 American Chemical Society