Type

Journal Article

Authors

Niall Mcevoy
Arlene O'Neill
Gareth Keeley
Georg Duesberg
Jonathan Coleman

Subjects

Chemistry

Topics
raman spectroscopy cyclic voltammetry electrode design surface area ascorbic acid dmf exfoliated graphene nanoscience materials electrochemical impedance spectroscopy

Electrochemical ascorbic acid sensor based on DMF-exfoliated graphene (2010)

Abstract This paper describes the electron transfer properties of graphene nano-sheets (GNSs) immobilised on pyrolysed photoresist film (PPF) electrodes. The former are produced by the dispersion and exfoliation of graphite in dimethylformamide, and they are characterised using transmission electron microscopy, scanning electron microscopy and Raman spectroscopy. Cyclic voltammetry and electrochemical impedance spectroscopy are used to quantify the effect of the GNSs on electrochemical surface area and on electron transfer kinetics. Compelling evidence is reported in relation to the importance of edge-plane sites and defects in the promotion of electron transfer at carbon nanostructures. A novel ascorbic acid (vitamin C) sensor is presented based on the PPF/GNS system, which is effective in the range 0.4 to 6.0 mM, with a 0.12 mM detection limit. The selectivity of the sensor is demonstrated using a commercially available vitamin C supplement. This is the first report of the electrochemical properties of graphene nano-sheets produced using liquid-phase exfoliation, and it will serve as an important benchmark in the development of inexpensive graphene-based electrodes with high surface area and electro-catalytic activity.
Collections Ireland -> Trinity College Dublin -> Administrative Staff Authors (Scholarly Publications)
Ireland -> Trinity College Dublin -> Administrative Staff Authors

Full list of authors on original publication

Niall Mcevoy, Arlene O'Neill, Gareth Keeley, Georg Duesberg, Jonathan Coleman

Experts in our system

1
Niall Mcevoy
Trinity College Dublin
Total Publications: 54
 
2
Arlene O'Neill
Trinity College Dublin
Total Publications: 25
 
3
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
4
Jonathan Coleman
Trinity College Dublin
Total Publications: 217