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Trioctylphosphine (TOP) surfactant enables nickel nanoparticles to self-assemble into ordered nanolattices. This contrasts with other surfactants that cause random agglomeration, highlighting TOP

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Nickel nanoparticles (NPs) synthesis involves various surfactants influencing their assembly.
  • Controlling NP assembly is crucial for advanced material applications.
  • Previous studies suggest surfactant roles in NP self-assembly.

Purpose of the Study:

  • To investigate the self-assembly capabilities of nickel nanoparticles using different surfactants.
  • To determine the influence of surfactants like trioctylphosphine (TOP), triphenylphosphine (TPP), and oleylamine (OA) on NP morphology and assembly.
  • To identify surfactants that promote ordered nanolattice formation.

Main Methods:

  • Synthesis of nickel nanoparticles using TOP, TPP, OA, and their combinations.
  • Characterization of NP size, shape, and assembly using electron microscopy (implied).
  • Analysis of surfactant capping using Fourier-transformed infra-red (FTIR) spectroscopy.
  • Zeta potential measurements to assess particle stability and agglomeration.

Main Results:

  • TPP and OA surfactants resulted in randomly agglomerated, polydispersed NPs.
  • TOP, used alone or with OA, induced the formation of monodispersed NPs exhibiting natural nanolattice assembly.
  • FTIR confirmed the presence of surfactants and acetylacetonate ligands on NP surfaces.
  • Self-assembled nanolattices showed narrower zeta potential base-widths compared to randomly agglomerated NPs.

Conclusions:

  • TOP demonstrates a unique self-inducing capacity for forming monodispersed nickel nanoparticles and their self-assembled nanolattices.
  • The choice of surfactant significantly dictates the self-assembly behavior of nickel nanoparticles.
  • Ordered nanostructures formed with TOP exhibit enhanced stability, as indicated by zeta potential measurements.