Abstract
A method is proposed for the subtle control of multifunctional nanoparticles by applying an external magnetic field to induce a 1D assembly. Au coated Fe3O4 core–shell nanoparticles (Fe3O4@Au NPs) were used to fabricate conducting magnetoplasmonic nanochains (MPNCs). Fe3O4@Au NPs were synthesized in an aqueous solution by a one-step reaction, showing superparamagnetic property, and were well-dispersed and stable in water at physiological pH. The MPNCs were prepared on a solid substrate through magnetic-field-induced alignment of Fe3O4@Au NPs. The dimension of these MPNCs is simply controlled by adjusting magnetic field strength. In order to utilize MPNCs as sensing platform, an annealing step was performed to improve their electrical properties. The annealed MPNCs were used as electrical transducers for DNA detection by successively immobilizing DNA probe on MPNCs and hybridizing them with target DNA. A direct detection of the electrical changes was performed using linear sweep voltammetry (LSV). A significant resistance increase was observed upon hybridization of the target DNA to the probe DNA on MPNCs.
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