skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Stabilizing Fe Nanoparticles in the SmCo 5 Matrix

Abstract

We report a new strategy for stabilizing Fe nanoparticles (NPs) in the preparation of SmCo5–Fe nanocomposites. We coat the presynthesized Fe NPs with SiO2 and assemble the Fe/SiO2 NPs with Sm–Co–OH to form a mixture. After reductive annealing at 850 °C in the presence of Ca, we obtain SmCo5–Fe/SiO2 composites. Following aqueous NaOH washing and compaction, we produced exchange-coupled SmCo5–Fe nanocomposites with Fe NPs controlled at 12 nm. Our work demonstrates a successful strategy of stabilizing high moment magnetic NPs in a hard magnetic matrix to produce a nanocomposite with tunable magnetic properties.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
  2. Materials Science Division, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1409987
Report Number(s):
LLNL-JRNL-737360
Journal ID: ISSN 1530-6984
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 9; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Shen, Bo, Mendoza-Garcia, Adriana, Baker, Sarah E., McCall, Scott K., Yu, Chao, Wu, Liheng, and Sun, Shouheng. Stabilizing Fe Nanoparticles in the SmCo 5 Matrix. United States: N. p., 2017. Web. doi:10.1021/acs.nanolett.7b02593.
Shen, Bo, Mendoza-Garcia, Adriana, Baker, Sarah E., McCall, Scott K., Yu, Chao, Wu, Liheng, & Sun, Shouheng. Stabilizing Fe Nanoparticles in the SmCo 5 Matrix. United States. doi:10.1021/acs.nanolett.7b02593.
Shen, Bo, Mendoza-Garcia, Adriana, Baker, Sarah E., McCall, Scott K., Yu, Chao, Wu, Liheng, and Sun, Shouheng. 2017. "Stabilizing Fe Nanoparticles in the SmCo 5 Matrix". United States. doi:10.1021/acs.nanolett.7b02593. https://www.osti.gov/servlets/purl/1409987.
@article{osti_1409987,
title = {Stabilizing Fe Nanoparticles in the SmCo 5 Matrix},
author = {Shen, Bo and Mendoza-Garcia, Adriana and Baker, Sarah E. and McCall, Scott K. and Yu, Chao and Wu, Liheng and Sun, Shouheng},
abstractNote = {We report a new strategy for stabilizing Fe nanoparticles (NPs) in the preparation of SmCo5–Fe nanocomposites. We coat the presynthesized Fe NPs with SiO2 and assemble the Fe/SiO2 NPs with Sm–Co–OH to form a mixture. After reductive annealing at 850 °C in the presence of Ca, we obtain SmCo5–Fe/SiO2 composites. Following aqueous NaOH washing and compaction, we produced exchange-coupled SmCo5–Fe nanocomposites with Fe NPs controlled at 12 nm. Our work demonstrates a successful strategy of stabilizing high moment magnetic NPs in a hard magnetic matrix to produce a nanocomposite with tunable magnetic properties.},
doi = {10.1021/acs.nanolett.7b02593},
journal = {Nano Letters},
number = 9,
volume = 17,
place = {United States},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:
  • Ferromagnetic SmCo{sub 5} nanoparticles with large size have been directly synthesized by a magnetron-sputtering-based gas-phase condensation method. Based on this method, we studied the effect of thermodynamic environment for the growth of SmCo{sub 5} nanoparticles. It was found that the well-crystallized SmCo{sub 5} nanoparticle tends to form a hexagonal disk shape with its easy axis perpendicular to the disk plane. More importantly, under the condition of high sputtering current, well-crystallized nanoparticles were found to be formed through a three-stage growth process: aggregation, coalescence, and second crystallization.
  • We recently discovered that MgAl2O4 spinel {111} nano-facets optimally stabilize the small sizes of platinum nanoparticles even after severe high temperature aging treatments. Here we report the thermal stabilities of other precious metals with various physical and chemical properties on the MgAl2O4 spinel {111} facets, providing important new insights into the stabilization mechanisms. Besides Pt, Rh and Ir can also be successfully stabilized as small (1-3 nm) nanoparticles and even as single atomic species after extremely severe (800 °C, 1 week) oxidative aging. However, other metals either aggregate (Ru, Pd, Ag, and Au) or sublimate (Os) even during initial catalystmore » synthesis. On the basis of ab initio theoretical calculations and experimental observations, we rationalize that the exceptional stabilization originates from lattice matching, and the correspondingly strong attractive interactions at interfaces between the spinel {111} surface oxygens and epitaxial metals\metal oxides. On this basis, design principles for catalyst support oxide materials that are capable in stabilizing precious metals are proposed.« less
  • Graphical abstract: Electrochemical deposition of netlike gold nanoparticles (GNPs) on the surface of glassy carbon electrode and preparation of netlike GNPs in aqueous solution using ampicillin as a stabilizing reagent were proposed. The catalytic properties of netlike gold nanoparticles on the glassy carbon electrode for dopamine were demonstrated. The results indicate that the netlike gold nanoparticle modified electrode has an excellent repeatability and reproducibility. Display Omitted Highlights: ► Synthesis of netlike gold nanoparticles using ampicillin as a stabilizing reagent. ► Excellent repeatability and reproducibility of netlike gold nanoparticle modified glassy carbon electrode. ► The catalytic properties of netlike gold nanoparticlemore » for dopamine. -- Abstract: Electrochemical deposition of netlike gold nanoparticles on the surface of glassy carbon electrode and preparation of netlike GNPs in aqueous solution using ampicillin as a stabilizing reagent were proposed. The netlike gold nanoparticles were characterized by scanning electron microscope, transmission electron microscope, infrared spectrometer, UV spectrophotometer, powder X-ray diffractometer and electrochemical analyzer. The catalysis of the netlike gold nanoparticles on the glassy carbon electrode for dopamine was demonstrated. The results indicate that the gold nanoparticle modified electrode has an excellent repeatability and reproducibility.« less