A Comparison of Differently Synthesized Gold-coated Magnetic Nanoparticles as "Dispersible Electrodes'

作者：Silva Saimon Moraes; Tavallaie Roya; Alam Muhammad Tanzirul; Chuah Kyloon; Gooding J Justin^*

来源：Electroanalysis, 2016, 28(3): 431-438.

DOI：10.1002/elan.201500530

• Gold-coated magnetic nanoparticles
• dispersible electrodes
• electrochemical properties
• sensing interface
• assembly

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.

• 出版日期2016-3