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Title: Monodispersed core-shell Fe3O4@Au nanoparticles

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:
; ; ; ; ; ; ; ; ;
Publication Date:
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.
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
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.
@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}
}