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Non-Enzymatic Electrochemical Sensing Platform Based On Metal Nanoparticles Decorated Chemically Doped Graphene Nanocomposites

Luba Shabnam
Venue: Flexible Teaching Space (FTS), Level 2
J01 Chemical Engineering Building
Date: Friday 13 November 2015
Time: 11am
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About the Speaker

Luba Shabnam is a PhD candidate working under supervision of Professor Vincent Gomes and Professor Andrew Minett in the School of Chemical and Biomolecular Engineering.

Seminar details

Demand for electrochemical biosensors is of growing significance in food and biomedical industries, in clinical diagnostics, biological and environmental applications. These sensors have usually been fabricated by immobilising enzyme to the surface of the electrodes. However, enzyme based biosensors suffer from limitations such as unstable responses stemming from changes in pH, temperature, humidity, and the presence of interfering chemicals. Additional limitations include enzyme leaching, direct electron transfer between the active sites of enzyme and difficulties with electrons replacement to the electrode surface because the redox centre of the most enzymes is intensely embedded in enzyme molecules. To overcome these challenges, an alternative strategy that depends on direct electro-oxidation with non-enzymatic sensors has been proposed. The main goal is to determine a suitable catalyst having direct electrochemical activity and to overcome the limitations of existing enzymatic sensors. Here, we presented a facile one pot synthetic route to produce a nanocomposite with copper nanoparticles dispersed in nitrogen doped graphene (Cu-NGr). We used large flakes of liquid crystal graphene oxide to disperse the copper nanoparticle homogeneously over the surface via thermal annealing with uric acid as a solid precursor. The nanocomposite comprising of high atomic percentage of graphitic-N with high surface area and porous structure, which is important for developing non-enzymatic sensing platform to detect glucose.