The Effect of Temperature and Agitation on Polyethyleneimine Adsorption on Iron Oxide Magnetic Nanoparticles in the Synthesis of Iron Oxide-Au Core–Shell Nanoparticles

Abstract Recently, gold-coated magnetic nanoparticles have drawn the interest of researchers due to their unique magneto-plasmonic characteristics. Previous research has found that the magneto-optical Faraday effect of gold-coated magnetic nanoparticles can be effectively enhanced because of the surface plasmon resonance of the gold shell. Furthermore, gold-coated magnetic nanoparticles are ideal for biomedical applications because of their high stability and biocompatibility. In this work, we synthesized Fe3O4@Au core-shell nanoparticles and coated streptavidin (STA) on the surface. Streptavidin is a protein which can selectively bind to biotin with a strong affinity. STA is widely used in biotechnology research including enzyme-linked immunosorbent assay (ELISA), time-resolved immunofluorescence (TRFIA), biosensors, and targeted pharmaceuticals. The Faraday magneto-optical characteristics of the biofunctionalized Fe3O4@Au nanoparticles were measured and studied. We showed that the streptavidin-coated Fe3O4@Au nanoparticles still possessed the enhanced magneto-optical Faraday effect. As a result, the possibility of using biofunctionalized Fe3O4@Au nanoparticles for magneto-optical biomedical assays should be explored.

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Iron Oxide-Gold Core-Shell Nanoparticles as Multimodal Imaging Contrast Agent

IEEE Sensors Journal ◽

10.1109/jsen.2013.2253215 ◽

2013 ◽

Vol 13 (6) ◽

pp. 2341-2347 ◽

Cited By ~ 15

Author(s):

Luca Menichetti ◽

Leonardo Manzoni ◽

Luigi Paduano ◽

A. Flori ◽

Claudia Kusmic ◽

...

Keyword(s):

Iron Oxide ◽

Contrast Agent ◽

Multimodal Imaging ◽

Core Shell ◽

Shell Nanoparticles ◽

Gold Core ◽

Core Shell Nanoparticles ◽

Imaging Contrast Agent

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Synthesis of Monodisperse Iron Oxide and Iron/Iron Oxide Core/Shell Nanoparticles via Iron-Oleylamine Complex

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2006.338 ◽

2006 ◽

Vol 6 (7) ◽

pp. 2135-2140 ◽

Cited By ~ 8

Author(s):

S. Yu ◽

G. M. Chow

Keyword(s):

Iron Oxide ◽

Core Shell ◽

Shell Nanoparticles ◽

Iron Iron ◽

Iron Oxide Core ◽

Core Shell Nanoparticles

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Identification of aggregates of magnetic nanoparticles in ferrofluids at low concentrations

Journal of Applied Crystallography ◽

10.1107/s002188980301104x ◽

2003 ◽

Vol 36 (4) ◽

pp. 1069-1074 ◽

Cited By ~ 2

Author(s):

D. Eberbeck ◽

A. Lange ◽

M. Hentschel

Keyword(s):

Magnetic Nanoparticles ◽

Radial Distance ◽

Core Shell ◽

Shell Nanoparticles ◽

Core Diameter ◽

X Ray Scattering ◽

Low Concentrations ◽

Dilute Suspensions ◽

Shell Particles ◽

Core Shell Nanoparticles

Different very dilute suspensions of magnetic nanoparticles (magnetite surrounded by an organic shell) in water (ferrofluids) were investigated using small-angle X-ray scattering. It is shown that the scattering originates not only from noncorrelated core–shell nanoparticles, but also from larger structures. By modelling, these structures can be identified as close-packed clusters consisting of core–shell particles (core diameter ∼10 nm). The analysis of the radial distance distribution function, obtained by Fourier transformation of the scattered intensity, reveals a lower bound of the mean cluster size of about 40 nm. The formation of clusters is persistent, even in very dilute suspensions.

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Nanoporous and nanostructured materials made out of clusters for environmental applications

MRS Proceedings ◽

10.1557/proc-876-r10.4 ◽

2005 ◽

Vol 876 ◽

Author(s):

Jiji Antony ◽

Joseph Nutting ◽

Donald R. Baer ◽

You Qiang

Keyword(s):

Iron Oxide ◽

Chemical Reactivity ◽

Building Blocks ◽

High Rate ◽

Core Shell ◽

Shell Nanoparticles ◽

Nanoporous Films ◽

Iron Iron ◽

Iron Oxide Core ◽

Core Shell Nanoparticles

AbstractThe nanoporous materials prepared from iron-iron oxide core-shell nanoparticles are of great interest due to their enhanced possibilities for distribution in the environment, a high rate of chemical reactivity and also the possibility to enhance environmentally friendly reaction paths. However, production of these nanoparticle porous materials by conventional methods is difficult. Therefore, we use a cluster deposition system, which prepares the iron nanoclusters and iron-iron oxide core shell nanoclusters at room temperature. The nanoporous films are synthesized by using the nanoclusters as building blocks. These films are characterized using Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and the Brunauer-Emmett-Teller (BET) method for surface area determination.

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