Gold-coated cementite nanoparticles

An oxidation-resistant alternative to α-Iron

Michael D. Shultz, Scott Calvin, Gonzalez-Jimenez Fernando Gonzalez-Jimenez, Vladimiro Mujica, Blaine C. Alleluia, Everett E. Carpenter

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Iron-based nanoparticles are desirable for many applications because of their magnetic properties and inherent biocompatibility. Metallic iron, or α-Fe, is the most sought after because of its high saturation magnetization (up to 220 emu/g). This magnetization in iron nanoparticles is difficult to reach or maintain because of the ease of oxidation, which greatly reduces the magnetization values (90 emu/g or less). Here, we report the synthesis of an iron-based nanoparticle comprising a magnetic cementite core (Fe3C) that is more oxidation-resistant than α-Fe, an oxide layer, and a gold coating for passivation and easy functionalization. The nanoparticle structure was confirmed via X-ray absorption fine structure and Mössbauer experiments, and morphology was confirmed using transmission electron microscopy. Magnetic characterization yielded a saturation magnetization of 110 emu/g, thus demonstrating cementite as more stable alternative to α-Fe with higher magnetic moments than the iron oxides.

Original languageEnglish
Pages (from-to)5594-5600
Number of pages7
JournalChemistry of Materials
Volume21
Issue number23
DOIs
Publication statusPublished - Dec 8 2009

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Gold
Iron
Nanoparticles
Oxidation
Saturation magnetization
Magnetization
Gold coatings
Magnetic cores
X ray absorption
Magnetic moments
Iron oxides
Biocompatibility
Passivation
Oxides
Magnetic properties
Transmission electron microscopy
Experiments

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Shultz, M. D., Calvin, S., Fernando Gonzalez-Jimenez, G-J., Mujica, V., Alleluia, B. C., & Carpenter, E. E. (2009). Gold-coated cementite nanoparticles: An oxidation-resistant alternative to α-Iron. Chemistry of Materials, 21(23), 5594-5600. https://doi.org/10.1021/cm901708v

Gold-coated cementite nanoparticles : An oxidation-resistant alternative to α-Iron. / Shultz, Michael D.; Calvin, Scott; Fernando Gonzalez-Jimenez, Gonzalez-Jimenez; Mujica, Vladimiro; Alleluia, Blaine C.; Carpenter, Everett E.

In: Chemistry of Materials, Vol. 21, No. 23, 08.12.2009, p. 5594-5600.

Research output: Contribution to journalArticle

Shultz, MD, Calvin, S, Fernando Gonzalez-Jimenez, G-J, Mujica, V, Alleluia, BC & Carpenter, EE 2009, 'Gold-coated cementite nanoparticles: An oxidation-resistant alternative to α-Iron', Chemistry of Materials, vol. 21, no. 23, pp. 5594-5600. https://doi.org/10.1021/cm901708v
Shultz MD, Calvin S, Fernando Gonzalez-Jimenez G-J, Mujica V, Alleluia BC, Carpenter EE. Gold-coated cementite nanoparticles: An oxidation-resistant alternative to α-Iron. Chemistry of Materials. 2009 Dec 8;21(23):5594-5600. https://doi.org/10.1021/cm901708v
Shultz, Michael D. ; Calvin, Scott ; Fernando Gonzalez-Jimenez, Gonzalez-Jimenez ; Mujica, Vladimiro ; Alleluia, Blaine C. ; Carpenter, Everett E. / Gold-coated cementite nanoparticles : An oxidation-resistant alternative to α-Iron. In: Chemistry of Materials. 2009 ; Vol. 21, No. 23. pp. 5594-5600.
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