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Smallest Bimetallic CoPt3 Superparamagnetic Nanoparticles.

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Researchers developed a new method to create tiny magnetic cobalt-platinum (CoPt3) nanoparticles. These ultrasmall nanoparticles exhibit superparamagnetic properties and can self-assemble into unique chain structures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Producing ultrasmall magnetic nanoparticles with controlled structures remains a challenge.
  • Bimetallic nanoparticles offer unique magnetic and catalytic properties.

Purpose of the Study:

  • To develop a novel nonaqueous sol-gel route for synthesizing ultrasmall (<2 nm) magnetic bimetallic cobalt-platinum (CoPt3) nanoparticles.
  • To characterize the structural, compositional, and magnetic properties of the synthesized CoPt3 nanoparticles.

Main Methods:

  • One-pot nonaqueous sol-gel synthesis at low temperature (180 °C) using benzyl alcohol.
  • Advanced X-ray methods (whole powder pattern modeling), High-Resolution Scanning Transmission Electron Microscopy (HR-STEM), X-ray Photoelectron Spectroscopy (XPS), and SQUID magnetometry.

Main Results:

  • Highly monodisperse, spherical CoPt3 nanoparticles with an average diameter of 1.6 nm were produced.
  • XPS confirmed metallic Co with a minor CoO surface presence. Nanoparticles self-assembled into linear chains or nanobelts.
  • Superparamagnetic behavior observed with a blocking temperature of ~20 K and coercivity of 27.9 kA m⁻¹ at 10 K.

Conclusions:

  • The developed sol-gel method offers a facile route to ultrasmall, self-assembling CoPt3 nanoparticles.
  • The nanoparticles exhibit superparamagnetism, with potential for applications in data storage and biomedical fields.
  • The presence of a minor CoO phase slightly enhances magnetization without compromising superparamagnetism.