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Title: Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly

Abstract

This paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)–shell (gold) nanocomposite and their assembly towards thin film materials. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe oxide@Au). The unique aspect of our synthesis is the formation of Fe oxide@Au core–shell nanoparticles with controllable surface properties. The novelty of our assembly strategy is the exploitation of the ligand-exchange reactivity at the gold shells for the thin film assembly of the core–shell nanoparticles. The core–shell nanocomposites and assemblies have been characterized using TEM, XRD, XPS, FTIR, TGA, and DCP-AES techniques. In addition to evidence from TEM detection of the change in particle size, UV-Vis observation of the change in the surface plasmon resonance band, and XRD detection of disappearance of the magnetite diffraction peaks after coating the gold shell, the formation of the core–shell morphology was further confirmed by DCP-AES composition analysis of Au and Fe in the molecularly-mediated thin film assembly of Fe oxide@Au particles. The interparticle ligand exchange–precipitation chemistry at the gold shell is to ourmore » knowledge the first example demonstrating the inter-shell reactivity for constructing thin films of Fe oxide@Au particles. The results have provided important insights into the design of interfacial reactivities via core–shell nanocomposites for magnetic, catalytic and biosensing applications.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
15020659
Report Number(s):
PNNL-SA-45191
2506; 6899; KP1302000; TRN: US0504682
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Materials Chemistry, 15(18):1821-1832
Additional Journal Information:
Journal Volume: 15; Journal Issue: 18
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHEMISTRY; COATINGS; DETECTION; DIFFRACTION; GOLD; ION EXCHANGE; IRON; IRON OXIDES; LIGANDS; MAGNETITE; MORPHOLOGY; PARTICLE SIZE; PLASMONS; RESONANCE; SURFACE PROPERTIES; SYNTHESIS; THIN FILMS; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; Nanotechnology, nanoparticles; Environmental Molecular Sciences Laboratory

Citation Formats

Wang, Lingyan, Luo, Jin, Maye, Mathew M, Fan, Quan, Qiang, Rendeng, Engelhard, Mark H, Wang, Chong M, Lin, Yuehe, and Zhong, Chuan-Jian. Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly. United States: N. p., 2005. Web. doi:10.1039/b501375e.
Wang, Lingyan, Luo, Jin, Maye, Mathew M, Fan, Quan, Qiang, Rendeng, Engelhard, Mark H, Wang, Chong M, Lin, Yuehe, & Zhong, Chuan-Jian. Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly. United States. https://doi.org/10.1039/b501375e
Wang, Lingyan, Luo, Jin, Maye, Mathew M, Fan, Quan, Qiang, Rendeng, Engelhard, Mark H, Wang, Chong M, Lin, Yuehe, and Zhong, Chuan-Jian. 2005. "Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly". United States. https://doi.org/10.1039/b501375e.
@article{osti_15020659,
title = {Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly},
author = {Wang, Lingyan and Luo, Jin and Maye, Mathew M and Fan, Quan and Qiang, Rendeng and Engelhard, Mark H and Wang, Chong M and Lin, Yuehe and Zhong, Chuan-Jian},
abstractNote = {This paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)–shell (gold) nanocomposite and their assembly towards thin film materials. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe oxide@Au). The unique aspect of our synthesis is the formation of Fe oxide@Au core–shell nanoparticles with controllable surface properties. The novelty of our assembly strategy is the exploitation of the ligand-exchange reactivity at the gold shells for the thin film assembly of the core–shell nanoparticles. The core–shell nanocomposites and assemblies have been characterized using TEM, XRD, XPS, FTIR, TGA, and DCP-AES techniques. In addition to evidence from TEM detection of the change in particle size, UV-Vis observation of the change in the surface plasmon resonance band, and XRD detection of disappearance of the magnetite diffraction peaks after coating the gold shell, the formation of the core–shell morphology was further confirmed by DCP-AES composition analysis of Au and Fe in the molecularly-mediated thin film assembly of Fe oxide@Au particles. The interparticle ligand exchange–precipitation chemistry at the gold shell is to our knowledge the first example demonstrating the inter-shell reactivity for constructing thin films of Fe oxide@Au particles. The results have provided important insights into the design of interfacial reactivities via core–shell nanocomposites for magnetic, catalytic and biosensing applications.},
doi = {10.1039/b501375e},
url = {https://www.osti.gov/biblio/15020659}, journal = {Journal of Materials Chemistry, 15(18):1821-1832},
number = 18,
volume = 15,
place = {United States},
year = {Wed May 04 00:00:00 EDT 2005},
month = {Wed May 04 00:00:00 EDT 2005}
}