One-step synthesis of core(Cr)/shell(γ-Fe 2O 3) nanoparticles

Jriuan Lai; Kurikka V.P.M. Shafi; Abraham Ulman; Katja Loos; Ronit Popovitz-Biro; Yongjae Lee; Thomas Vogt; Claude Estournès

doi:10.1021/ja0443225

One-step synthesis of core(Cr)/shell(γ-Fe ₂O ₃) nanoparticles

Jriuan Lai
, Kurikka V.P.M. Shafi
, Abraham Ulman
, Katja Loos
, Ronit Popovitz-Biro
, Yongjae Lee
, Thomas Vogt
, Claude Estournès

Department of Chemistry

Polytechnic University
NSF Garcia MRSEC Poly. Engineered I
University of Washington
Infineon Technologies AG
University of Groningen
Weizmann Institute of Science
Brookhaven National Laboratory
Groupe des Matériaux Inorganiques
Université Paul Sabatier Toulouse III

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Core(Cr)/shell(γ-Fe ₂O ₃) nanoparticles were synthesized by mixing Fe(CO) ₅ and Cr(CO) ₆ in the 9:1 ratio. These particles exhibit narrow size distribution with 13.5 nm as mean diameter and uniform spherical shape. The TEM image, which is in good agreement with the synchrotron powder XRD pattern, reveals the heterogeneous nature (core/shell structure). The analysis of the pattern reveals γ-Fe ₂O ₃ structure and a metal crystal structure. Mössbauer spectra, which support the superparamagnetic behavior determined by H-M measurement, do not show any traceable amount of Fe0. This suggests that the metal component is Cr. EELS analysis and iron mapping suggest controlled stoichiometry and also confirm a core made of Cr and a shell made of γ-Fe ₂O ₃.

Original language	English
Pages (from-to)	5730-5731
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	127
Issue number	16
DOIs	https://doi.org/10.1021/ja0443225
State	Published - 27 Apr 2005

Access to Document

10.1021/ja0443225

Cite this

@article{9e59f0d5b3c5496993bf10972f6960b3,

title = "One-step synthesis of core(Cr)/shell(γ-Fe 2O 3) nanoparticles",

abstract = "Core(Cr)/shell(γ-Fe 2O 3) nanoparticles were synthesized by mixing Fe(CO) 5 and Cr(CO) 6 in the 9:1 ratio. These particles exhibit narrow size distribution with 13.5 nm as mean diameter and uniform spherical shape. The TEM image, which is in good agreement with the synchrotron powder XRD pattern, reveals the heterogeneous nature (core/shell structure). The analysis of the pattern reveals γ-Fe 2O 3 structure and a metal crystal structure. M{\"o}ssbauer spectra, which support the superparamagnetic behavior determined by H-M measurement, do not show any traceable amount of Fe0. This suggests that the metal component is Cr. EELS analysis and iron mapping suggest controlled stoichiometry and also confirm a core made of Cr and a shell made of γ-Fe 2O 3.",

author = "Jriuan Lai and Shafi, \{Kurikka V.P.M.\} and Abraham Ulman and Katja Loos and Ronit Popovitz-Biro and Yongjae Lee and Thomas Vogt and Claude Estourn{\`e}s",

year = "2005",

month = apr,

day = "27",

doi = "10.1021/ja0443225",

language = "אנגלית",

volume = "127",

pages = "5730--5731",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "American Chemical Society",

number = "16",

}

TY - JOUR

T1 - One-step synthesis of core(Cr)/shell(γ-Fe 2O 3) nanoparticles

AU - Lai, Jriuan

AU - Shafi, Kurikka V.P.M.

AU - Ulman, Abraham

AU - Loos, Katja

AU - Popovitz-Biro, Ronit

AU - Lee, Yongjae

AU - Vogt, Thomas

AU - Estournès, Claude

PY - 2005/4/27

Y1 - 2005/4/27

N2 - Core(Cr)/shell(γ-Fe 2O 3) nanoparticles were synthesized by mixing Fe(CO) 5 and Cr(CO) 6 in the 9:1 ratio. These particles exhibit narrow size distribution with 13.5 nm as mean diameter and uniform spherical shape. The TEM image, which is in good agreement with the synchrotron powder XRD pattern, reveals the heterogeneous nature (core/shell structure). The analysis of the pattern reveals γ-Fe 2O 3 structure and a metal crystal structure. Mössbauer spectra, which support the superparamagnetic behavior determined by H-M measurement, do not show any traceable amount of Fe0. This suggests that the metal component is Cr. EELS analysis and iron mapping suggest controlled stoichiometry and also confirm a core made of Cr and a shell made of γ-Fe 2O 3.

AB - Core(Cr)/shell(γ-Fe 2O 3) nanoparticles were synthesized by mixing Fe(CO) 5 and Cr(CO) 6 in the 9:1 ratio. These particles exhibit narrow size distribution with 13.5 nm as mean diameter and uniform spherical shape. The TEM image, which is in good agreement with the synchrotron powder XRD pattern, reveals the heterogeneous nature (core/shell structure). The analysis of the pattern reveals γ-Fe 2O 3 structure and a metal crystal structure. Mössbauer spectra, which support the superparamagnetic behavior determined by H-M measurement, do not show any traceable amount of Fe0. This suggests that the metal component is Cr. EELS analysis and iron mapping suggest controlled stoichiometry and also confirm a core made of Cr and a shell made of γ-Fe 2O 3.

UR - https://www.scopus.com/pages/publications/17744389609

U2 - 10.1021/ja0443225

DO - 10.1021/ja0443225

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:17744389609

SN - 0002-7863

VL - 127

SP - 5730

EP - 5731

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 16

ER -

One-step synthesis of core(Cr)/shell(γ-Fe ₂O ₃) nanoparticles

Abstract

Access to Document

Other files and links

Fingerprint

Cite this