This research develops a green synthesis approach without using organic solvent, toxic reducing agents and chemicals to obtain size controllable metal and metal alloy nanoparticles. A salt matrix, NaCl, is utilized as the medium for dispersing metal salt/complexes and plays a role in preventing the formed nanoparticles from severe sintering. The reduction of metal salt/complexes can be obtained under a reducing gas, such as H<sub>2</sub>/N<sub>2</sub>, in a conventional electric tube furnace at normal pressure. The resulting nanoparticles can be easily purified and collected after dissolving the matrix in water. Using the method, nanoparticles of Fe and its alloy have been synthesized. The synthesis parameters such as temperature and time, the weight ratio of metal precursors and salt matrix, and the synthesis steps have been investigated. These factors have an impact on particle size and uniformity where in a higher salt ratio and a lower temperature results in smaller particles with higher uniformity. It is also found that the resulting nanoparticles are stable in air, which then can be attributed to the surface coating layers comprising metal oxides, C, and decomposed ligands. The source of the surface C is from the metal complex precursors or the added ligand. Further, the nanoparticles exhibit magnetic properties, making them a potential candidate for various applications. Thus, the method is advantageous for green synthesis and applications of nanoparticles in term of cleanness, scalable capability, and its general applicability for various types of metal, metal oxides, and metal alloys.

Scalable and green synthesis of metal and metal alloy nanoparticles in a solid matrix

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.