Factors affecting formation of metastable Ni3C phase in a solution-based method

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Synthesis

Background:

• Nickel carbide (Ni3C) is a metastable phase with potential applications.
• Synthesis of Ni3C nanoparticles requires controlled conditions.
• Understanding the formation mechanism is crucial for material design.

Purpose of the Study:

• To synthesize Ni3C nanoparticles using organometallic precursors.
• To investigate the formation mechanism of Ni3C nanoparticles.
• To explore conditions for controlling Ni3C and Ni nanoparticle synthesis.

Main Methods:

• Thermal decomposition of organometallic precursors in organic solution.
• Utilizing nickel nanoparticles as intermediates.
• Varying reaction temperature and time to study kinetics.

Main Results:

• Ni3C nanoparticles are formed through nickel nanoparticle intermediates.
• Carbon incorporation into the nickel lattice is diffusion-controlled.
• Reaction rate is enhanced by higher temperatures and longer reaction times.
• Active carbon-containing organic molecules serve as effective carbon sources.

Conclusions:

• Metastable Ni3C phase can be controllably synthesized.
• The synthesis method provides insights into nanoparticle formation.
• This work can guide the selective synthesis of Ni nanoparticles by avoiding Ni3C formation.