Wet-chemical synthesis and properties of CoPt and CoPt3 alloy nanoparticles

J Nanosci Nanotechnol. 2002 Oct;2(5):509-15. doi: 10.1166/153348802760394098.

Abstract

Surface-protected, air-stable nanoparticles of CoPt and CoPt3 were prepared by thermal decomposition/reduction of organometallic precursors with a long-chain aliphatic diol, also known as the polyol process. Particles 3 nm in diameter showed ferromagnetic behavior up to 350 K (Hc = 65 Oe at T = 300 K; Hc = 410 Oe at T = 5K) and underwent a disordering-ordering phase transformation after annealing that resulted in an increase in coercivity (Hc = 170 Oe at T = 300 K; Hc = 2000 Oe at T = 5 K).

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Alloys / chemical synthesis
  • Alloys / chemistry*
  • Alloys / isolation & purification
  • Crystallization / methods*
  • Hot Temperature*
  • Magnetics*
  • Materials Testing / methods
  • Microspheres
  • Molecular Conformation
  • Nanotechnology / instrumentation
  • Nanotechnology / methods*
  • Particle Size
  • Powders
  • Solutions / chemistry
  • Surface Properties
  • Temperature
  • Wettability
  • X-Ray Diffraction

Substances

  • Alloys
  • Powders
  • Solutions
  • cobalt platinum alloy