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Trapping Iron Oxide into Hollow Gold Nanoparticles

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ABSTRACT

Synthesis of the core/shell-structured Fe3O4/Au nanoparticles by trapping Fe3O4 inside hollow Au nanoparticles is described. The produced composite nanoparticles are strongly magnetic with their surface plasmon resonance peaks in the near infrared region (wavelength from 700 to 800 nm), combining desirable magnetic and plasmonic properties into one nanoparticle. They are particularly suitable for in vivo diagnostic and therapeutic applications. The intact Au surface provides convenient anchorage sites for attachment of targeting molecules, and the particles can be activated by both near infrared lights and magnetic fields. As more and more hollow nanoparticles become available, this synthetic method would find general applications in the fabrication of core–shell multifunctional nanostructures.

No MeSH data available.


a EDS spectrum of one single particle, showing the coexistence of Au and Fe. b SAED pattern from three particles, showing a superposition of Au and Fe3O4 lattices.
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Figure 3: a EDS spectrum of one single particle, showing the coexistence of Au and Fe. b SAED pattern from three particles, showing a superposition of Au and Fe3O4 lattices.

Mentions: The loading of Fe3O4 to the core of PHAuNPs was confirmed by energy-dispersive X-ray (EDS) analysis of one single particle and the selected area electron diffraction (SAED) pattern from three particles. EDS shows the coexistence of Au and Fe in a single particle (Figure 3a, Cu peak is from the TEM grid). The low intensity of Fe may be due to the shield effect of the thick Au shell. The SAED pattern is a superposition of Au and Fe3O4 lattices (Figure 3b), showing three distinguishable planes of (311), (511), and (731) from Fe3O4. Other Fe3O4 planes overlap with Au planes.


Trapping Iron Oxide into Hollow Gold Nanoparticles
a EDS spectrum of one single particle, showing the coexistence of Au and Fe. b SAED pattern from three particles, showing a superposition of Au and Fe3O4 lattices.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211847&req=5

Figure 3: a EDS spectrum of one single particle, showing the coexistence of Au and Fe. b SAED pattern from three particles, showing a superposition of Au and Fe3O4 lattices.
Mentions: The loading of Fe3O4 to the core of PHAuNPs was confirmed by energy-dispersive X-ray (EDS) analysis of one single particle and the selected area electron diffraction (SAED) pattern from three particles. EDS shows the coexistence of Au and Fe in a single particle (Figure 3a, Cu peak is from the TEM grid). The low intensity of Fe may be due to the shield effect of the thick Au shell. The SAED pattern is a superposition of Au and Fe3O4 lattices (Figure 3b), showing three distinguishable planes of (311), (511), and (731) from Fe3O4. Other Fe3O4 planes overlap with Au planes.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Synthesis of the core/shell-structured Fe3O4/Au nanoparticles by trapping Fe3O4 inside hollow Au nanoparticles is described. The produced composite nanoparticles are strongly magnetic with their surface plasmon resonance peaks in the near infrared region (wavelength from 700 to 800 nm), combining desirable magnetic and plasmonic properties into one nanoparticle. They are particularly suitable for in vivo diagnostic and therapeutic applications. The intact Au surface provides convenient anchorage sites for attachment of targeting molecules, and the particles can be activated by both near infrared lights and magnetic fields. As more and more hollow nanoparticles become available, this synthetic method would find general applications in the fabrication of core–shell multifunctional nanostructures.

No MeSH data available.