CVD graphene electrochemistry: biologically relevant molecules

We investigate the electrochemical properties of CVD grown graphene towards the detection of various biologically prevalent analytes including l-ascorbic acid (AA), dopamine hydrochloride (DA), β-nicotinamide adenine dinucleotide (NADH), uric acid (UA) and epinephrine (EP). We find that the observed...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2011-12, Vol.13 (45), p.20284-20288
Main Authors: BROWNSON, Dale A. C, GOMEZ-MINGOT, Maria, BANKS, Craig E
Format: Article
Language:English
Subjects:
Ascorbic Acid - analysis
Biosensing Techniques - methods
Chemical vapor deposition
Chemistry
Dopamine - analysis
Electrochemical Techniques - methods
Electrochemistry
Electrodes
Epinephrine
Epinephrine - analysis
Exact sciences and technology
General and physical chemistry
Graphene
Graphite - chemistry
Islands
NAD - analysis
Pyrolytic graphite
Uric acid
Uric Acid - analysis
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Summary:We investigate the electrochemical properties of CVD grown graphene towards the detection of various biologically prevalent analytes including l-ascorbic acid (AA), dopamine hydrochloride (DA), β-nicotinamide adenine dinucleotide (NADH), uric acid (UA) and epinephrine (EP). We find that the observed electrochemical response of the CVD-graphene towards these select analytes does not originate from the graphene, however, from various other contributions including the presence of 'graphitic islands' on the surface of the CVD-graphene which dominate its electrochemistry. In the systems studied within, it appears at best, CVD-graphene acts akin to that of an edge plane pyrolytic graphite (EPPG) electrode constructed from highly ordered pyrolytic graphite. However, in other cases, the response of the CVD-graphene is worse than that of an EPPG electrode, which is likely due to the low O/C ratio.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp22648g