Monodispersed core-shell Fe3O4@Au nanoparticles

doi:https://doi.org/10.1021/jp0543429

Title: Monodispersed core-shell Fe3O4@Au nanoparticles

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Abstract

The ability to synthesize and assemble monodispersed core-shell nanoparticles is important for exploring the unique properties of nanoscale core, shell, or their combinations in technological applications. This paper describes findings of an investigation of the synthesis and assembly of core (Fe3O4)-shell (An) nanoparticles with high monodispersity. Fe3O4 nanoparticles of selected sizes were used as seeding materials for the reduction of gold precursors to produce gold-coated Fe3O4 nanoparticles (Fe3O4@Au). Experimental data from both physical and chemical determinations of the changes in particle size, surface plasmon resonance optical band, core-shell composition, surface reactivity, and magnetic properties have confirmed the formation of the core-shell nanostructure. The interfacial reactivity of a combination of ligand-exchanging and interparticle cross-linking was exploited for molecularly mediated thin film assembly of the core-shell nanoparticles. The SQUID data reveal a decrease in magnetization and blocking temperature and an increase in coercivity for Fe3O4@Au, reflecting the decreased coupling of the magnetic moments as a result of the increased interparticle spacing by both gold and capping shells. Implications of the findings to the design of interfacial reactivities via core-shell nanocomposites for magnetic, catalytic, and biological applications are also briefly discussed.

Authors:: Wang, L Y; Luo, Jin; Fan, Quan; Suzuki, Masatsugu; Suzuki, Itsuko S; Engelhard, Mark H; Lin, Yuehe; Kim, Nam; Wang, JQ; Zhong, Chuan-Jian

Publication Date:: 2005-12-15

Research Org.:: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Org.:: USDOE

OSTI Identifier:: 876992

Report Number(s):: PNNL-SA-47794
Journal ID: ISSN 1089-5647; JPCBFK; 2506a; TRN: US0601576

DOE Contract Number:: AC05-76RL01830

Resource Type:: Journal Article

Journal Name:: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

Additional Journal Information:: Journal Volume: 109; Journal Issue: 46; Journal ID: ISSN 1089-5647

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS-LINKING; DESIGN; GOLD; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETIZATION; PARTICLE SIZE; PLASMONS; RESONANCE; SYNTHESIS; THIN FILMS; Nanoparticles; Environmental Molecular Sciences Laboratory

Citation Formats


                    Wang, L Y, Luo, Jin, Fan, Quan, Suzuki, Masatsugu, Suzuki, Itsuko S, Engelhard, Mark H, Lin, Yuehe, Kim, Nam, Wang, JQ, and Zhong, Chuan-Jian. Monodispersed core-shell Fe3O4@Au nanoparticles.  United States: N. p., 2005. 
        Web.  doi:10.1021/jp0543429.

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                    Wang, L Y, Luo, Jin, Fan, Quan, Suzuki, Masatsugu, Suzuki, Itsuko S, Engelhard, Mark H, Lin, Yuehe, Kim, Nam, Wang, JQ, & Zhong, Chuan-Jian. Monodispersed core-shell Fe3O4@Au nanoparticles.  United States.  https://doi.org/10.1021/jp0543429

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                    Wang, L Y, Luo, Jin, Fan, Quan, Suzuki, Masatsugu, Suzuki, Itsuko S, Engelhard, Mark H, Lin, Yuehe, Kim, Nam, Wang, JQ, and Zhong, Chuan-Jian. Thu .  
        "Monodispersed core-shell Fe3O4@Au nanoparticles".  United States.  https://doi.org/10.1021/jp0543429.

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@article{osti_876992,

  title        = {Monodispersed core-shell Fe3O4@Au nanoparticles},

  author       = {Wang, L Y and Luo, Jin and Fan, Quan and Suzuki, Masatsugu and Suzuki, Itsuko S and Engelhard, Mark H and Lin, Yuehe and Kim, Nam and Wang, JQ and Zhong, Chuan-Jian},

  abstractNote = {The ability to synthesize and assemble monodispersed core-shell nanoparticles is important for exploring the unique properties of nanoscale core, shell, or their combinations in technological applications. This paper describes findings of an investigation of the synthesis and assembly of core (Fe3O4)-shell (An) nanoparticles with high monodispersity. Fe3O4 nanoparticles of selected sizes were used as seeding materials for the reduction of gold precursors to produce gold-coated Fe3O4 nanoparticles (Fe3O4@Au). Experimental data from both physical and chemical determinations of the changes in particle size, surface plasmon resonance optical band, core-shell composition, surface reactivity, and magnetic properties have confirmed the formation of the core-shell nanostructure. The interfacial reactivity of a combination of ligand-exchanging and interparticle cross-linking was exploited for molecularly mediated thin film assembly of the core-shell nanoparticles. The SQUID data reveal a decrease in magnetization and blocking temperature and an increase in coercivity for Fe3O4@Au, reflecting the decreased coupling of the magnetic moments as a result of the increased interparticle spacing by both gold and capping shells. Implications of the findings to the design of interfacial reactivities via core-shell nanocomposites for magnetic, catalytic, and biological applications are also briefly discussed.},

  doi          = {10.1021/jp0543429},

  url          = {https://www.osti.gov/biblio/876992},
  journal      = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},

  issn         = {1089-5647},

  number       = 46,

  volume       = 109,

  place        = {United States},

  year         = {2005},

  month        = {12}

}

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