Superparamagnetic sub-5 nm Fe@C nanoparticles: Isolation, structure, magnetic properties, and directed assembly

Yuhuang Wang; Wei Wei; Daniel Maspoch; Jinsong Wu; Vinayak P. Dravid; Chad A. Mirkin

doi:10.1021/nl8020768

Superparamagnetic sub-5 nm Fe@C nanoparticles: Isolation, structure, magnetic properties, and directed assembly

Yuhuang Wang, Wei Wei, Daniel Maspoch, Jinsong Wu, Vinayak P. Dravid, Chad A. Mirkin

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

A method for isolating single crystalline sub-5 nm carbon coated iron nanoparticles (Fe@C NPs) from a carbon nanotube matrix has been developed. The isolation of such particles allows for their characterization by high resolution electron microscopy methods and SQUID magnetometry. While the NPs are superparamagnetic at room temperature, at 10 K they exhibit a coercivity nearly 30 times greater than that of commercial Fe ₃O ₄ NPs of comparable size. A novel nanotemplate directed assembly method for manipulating the particles at the individual particle level is also reported.

Original language	English (US)
Pages (from-to)	3761-3765
Number of pages	5
Journal	Nano letters
Volume	8
Issue number	11
DOIs	https://doi.org/10.1021/nl8020768
State	Published - Nov 2008

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl8020768

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abstract = "A method for isolating single crystalline sub-5 nm carbon coated iron nanoparticles (Fe@C NPs) from a carbon nanotube matrix has been developed. The isolation of such particles allows for their characterization by high resolution electron microscopy methods and SQUID magnetometry. While the NPs are superparamagnetic at room temperature, at 10 K they exhibit a coercivity nearly 30 times greater than that of commercial Fe 3O 4 NPs of comparable size. A novel nanotemplate directed assembly method for manipulating the particles at the individual particle level is also reported.",

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AU - Wang, Yuhuang

AU - Wei, Wei

AU - Maspoch, Daniel

AU - Wu, Jinsong

AU - Dravid, Vinayak P.

AU - Mirkin, Chad A.

PY - 2008/11

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N2 - A method for isolating single crystalline sub-5 nm carbon coated iron nanoparticles (Fe@C NPs) from a carbon nanotube matrix has been developed. The isolation of such particles allows for their characterization by high resolution electron microscopy methods and SQUID magnetometry. While the NPs are superparamagnetic at room temperature, at 10 K they exhibit a coercivity nearly 30 times greater than that of commercial Fe 3O 4 NPs of comparable size. A novel nanotemplate directed assembly method for manipulating the particles at the individual particle level is also reported.

AB - A method for isolating single crystalline sub-5 nm carbon coated iron nanoparticles (Fe@C NPs) from a carbon nanotube matrix has been developed. The isolation of such particles allows for their characterization by high resolution electron microscopy methods and SQUID magnetometry. While the NPs are superparamagnetic at room temperature, at 10 K they exhibit a coercivity nearly 30 times greater than that of commercial Fe 3O 4 NPs of comparable size. A novel nanotemplate directed assembly method for manipulating the particles at the individual particle level is also reported.

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Superparamagnetic sub-5 nm Fe@C nanoparticles: Isolation, structure, magnetic properties, and directed assembly

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