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Preparation of Palladium Ultrafine Particles in Reverse Micelles

Chen1, Wang, Huang

  • 1Department of Chemical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan

Journal of Colloid and Interface Science
|January 30, 1999
PubMed
Summary

Researchers synthesized pure palladium ultrafine particles using hydrazine reduction in reverse micellar solutions. Particle size was influenced by water-to-AOT ratio and palladium precursor concentration, but stabilized at higher hydrazine ratios.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Palladium ultrafine particles are crucial in catalysis and electronics.
  • Controlling particle size and morphology is essential for their applications.
  • Reverse micellar solutions offer a versatile medium for nanoparticle synthesis.

Purpose of the Study:

  • To investigate the synthesis of pure palladium ultrafine particles.
  • To understand the influence of reaction parameters on particle size and formation kinetics.
  • To characterize the resulting palladium particles.

Main Methods:

  • Synthesis via reduction of tetraamminepalladium(II) chloride (Pd(NH3)4Cl2) with hydrazine.
  • Utilizing AOT/isooctane reverse micellar solutions.

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  • Characterization using high-resolution electron microscopy, electron diffraction, and X-ray diffraction (XRD).

    • Main Results:

    • Pure face-centered cubic (fcc) palladium particles were successfully synthesized.
    • Particle size increased with water-to-AOT ratio (omega0) and Pd(NH3)4Cl2 concentration.
    • Particle size was largely unaffected by hydrazine concentration above a ratio of 10, AOT concentration, temperature, and pH.
    • Nucleation took several minutes, followed by growth within tens of minutes.

    Conclusions:

    • The study successfully prepared pure fcc palladium ultrafine particles.
    • Reaction parameters like omega0 and precursor concentration are key for size control.
    • The formation process involves nucleation followed by diffusion-controlled growth.