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

10 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

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Gold-coated cementite nanoparticles: An oxidation-resistant alternative to α-Iron'. Together they form a unique fingerprint.

  • 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