Direct synthesis and size selection of ferromagnetic FePt nanoparticles

Matthew S. Wellons, William H. Morris, Zheng Gai, Jian Shen, James Bentley, James E. Wittig, Charles M. Lukehart

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

A one-step synthesis of L10 FePt nanoparticles ca. 17.0 nm in diameter by reductive decomposition of the single-source precursor, FePt(CO)4dppmBr2, on a water-soluble support (Na 2CO3) is demonstrated. Direct conversion of a FePt(CO)4dppinBr2/Na2CO3 composite to a L10 FePt/Na2CO3 nanocomposite occurs at 600 °C under getter gas with metal-ion reduction and minimal nanoparticle coalescence. Triturating the resulting nanocomposite with water simultaneously dissolves the sodium carbonate solid support and precipitates the formed fct FePt nanoparticles. As-prepared FePt nanoparticles are ferromagnetic and exhibit coercivities of 14.5 kOe at 300 K and 21.8 kOe at 5 K. When capped by functionalized methoxypoly(ethylene glycol) surfactant molecules, as-prepared, polydisperse ferromagnetic FePt nanoparticles can be dispersed and size-selected by fractional precipitation.

Original languageEnglish
Pages (from-to)2483-2488
Number of pages6
JournalChemistry of Materials
Volume19
Issue number10
DOIs
StatePublished - May 15 2007

Fingerprint

Dive into the research topics of 'Direct synthesis and size selection of ferromagnetic FePt nanoparticles'. Together they form a unique fingerprint.

Cite this