A Comparison of Differently Synthesized Gold‐coated Magnetic Nanoparticles as ‘Dispersible Electrodes’ |
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Authors: | Saimon Moraes Silva Roya Tavallaie Muhammad Tanzirul Alam Kyloon Chuah J Justin Gooding |
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Institution: | School of Chemistry, Australian Centre for NanoMedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of New South Wales, Sydney, Australia |
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Abstract: | Gold‐coated magnetic nanoparticles (Au@MNPs) have attracted significant interest in electrochemistry in recent years. This is especially the case with their application as dispersible electrodes where modified Au@MNPs are dispersed into a solution, selectively bind to the analyte of interest and are then brought to an electrode via application of a magnetic field for measurement. This paper characterizes four types of Au@MNPs with different sizes, shapes, and method of synthesis as dispersible electrodes. The Au@MNPs were characterized by transmission electron microscopy and X‐ray photoelectron spectroscopy and scanning electron microscopy. In addition, the electrochemical behaviour of Au@MNPs was investigated using cyclic voltammetry. The four sorts of Au@MNPs were evaluated with regards to the three main features required in the dispersible electrodes approach, well‐defined morphology, well‐defined electrochemistry and fast response to a magnetic field. The Cubic‐Au@MNPs, which presents the simplest synthetic route, showed the best electrochemical stability and performance, responding quickly to a magnet and had a well defined shape. |
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Keywords: | Gold-coated magnetic nanoparticles dispersible electrodes electrochemical properties sensing interface assembly |
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