NDLI: Synthesis of core-shell gold coated magnetic nanoparticles and their interaction with thiolated DNA

Content Provider	Royal Society of Chemistry (RSC)
Author	Thanh, Nguyen T. K. Maenosono, Shinya Tung, Le D. Robinson, Ian Wälti, Christoph
Copyright Year	2010
Abstract	Core-shell magnetic nanoparticles have received significant attention recently and are actively investigated owing to their large potential for a variety of applications. Here, the synthesis and characterization of bimetallic nanoparticles containing a magnetic core and a gold shell are discussed. The gold shell facilitates, for example, the conjugation of thiolated biological molecules to the surface of the nanoparticles. The composite nanoparticles were produced by the reduction of a gold salt on the surface of pre-formed cobalt or magnetite nanoparticles. The synthesized nanoparticles were characterized using ultraviolet-visible absorption spectroscopy, transmission electron microscopy, energy dispersion X-ray spectroscopy, X-ray diffraction and super-conducting quantum interference device magnetometry. The spectrographic data revealed the simultaneous presence of cobalt and gold in 5.6 ± 0.8 nm alloy nanoparticles, and demonstrated the presence of distinct magnetite and gold phases in 9.2 ± 1.3 nm core-shell magnetic nanoparticles. The cobalt-gold nanoparticles were of similar size to the cobalt seed, while the magnetite-gold nanoparticles were significantly larger than the magnetic seeds, indicating that different processes are responsible for the addition of the gold shell. The effect on the magnetic properties by adding a layer of gold to the cobalt and magnetite nanoparticles was studied. The functionalization of the magnetic nanoparticles is demonstrated through the conjugation of thiolated DNA to the gold shell.
Starting Page	2624
Ending Page	2630
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	2
Issue Number	12
Journal	Nanoscale
DOI	10.1039/c0nr00621a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy X-ray crystallography Magnetite Transmission electron microscopy DNA Gold salts Magnetic core Magnetometer X-ray spectroscopy Cobalt London dispersion force Quantum tunnelling
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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