Innovative multiphase ultrasonic-assisted method for high-purity, stable, and cost-effective copper nanowire synthesis

The synthesis of copper nanowires (CuNWs) using modified polyols with hexadecylamine or octadecylamine as capping agents, known for their ease of operation, rapid reaction, and suitability for mass production, often encounters challenges such as the presence of copper particles, numerous copper nanorods, difficulty in purifying organic compounds, and air instability as by-products. In addressing these issues, this study introduces an innovative multiphase ultrasonic-assisted separation method. By utilizing ultrasound to accelerate the dissolution of hexadecylamine and facilitate the separation movement of CuNWs and by-products in hydrophilic and hydrophobic phases, the aim of achieving high purification of CuNWs is realized. Through the introduction of an ultra-thin hexadecylamine layer (~ 3.5 nm) on the surface of CuNWs and leveraging the active adsorption of silver seed crystals, combined with the control CuNWs reaction concentration, silver-coated CuNWs with a dense and uniform surface thickness of 12–15 nm are obtained. By enhancing purity, stability, and cost-effectiveness, this research represents a significant advancement in the field of one-dimensional nanowires and their devices.