Journal
ELECTROANALYSIS
Volume 28, Issue 3, Pages 431-438Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201500530
Keywords
Gold-coated magnetic nanoparticles; dispersible electrodes; electrochemical properties; sensing interface; assembly
Categories
Funding
- Australian Research Council [CE140100036]
- University of New South Wales
- CNPq, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- INCTBio, Instituto Nacional de Ciencia e Tecnologia em Bioanalitica - Brasil
- Australian Research Council [CE140100036] Funding Source: Australian Research Council
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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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