Electrochemical ascorbic acid sensor based on DMF-exfoliated graphene

By G. Keeley, A. O’Neill, Niall McEvoy, N. Peltekis, Jonathan N. Coleman, Georg S. Duesberg. 2010

211 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering, Electrochemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/fd1a16d499dcc2f63ad605256be1e8a2d7b41553

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

In Polymers and Plastics

K. Novoselov

Citations in the corpus

Graphene Sensors (2011, methodology): “Cyclic voltammograms recorded at bare (dashed) and GNS modified (solid) PPF electrodes in 1 mM ascorbic acid in 50 mM pH 7 phosphate buffer at a sweep rate of 100 [44].”
Preparation, mechanical and thermal properties of functionalized graphene/polyimide nanocomposites (2012, background): “including nanoelectronics [25,26], sensors [27,28], supercapacitors [29,30], and composite reinforcements [31–33].”
Determination of ascorbic acid, dopamine, and uric acid by a novel electrochemical sensor based on pristine graphene (2015, background): “PG/PPFE 400–6000 – – 120 – – [19]”