Oleylamine, a long-chain primary alkylamine, serves multiple roles in the synthesis of nanoparticles, functioning as a solvent, surfactant, and reducing agent. This compound (primary amine) forms metastable complexes with metal ions, which decompose in a controlled manner to yield nanoparticles. Additionally, Oleylamine (primary amine) regulates the morphology of nanoparticles, prevents their aggregation, and reduces metal precursors to metallic nanoparticles.