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Metal nanomaterials can be synthesized using various methods, including chemical reduction, physical vapor deposition, and electrochemical deposition. Chemical reduction involves the reduction of metal ions to form metal nanoparticles using a reducing agent. Physical vapor deposition involves the evaporation of metal atoms followed by their condensation on a substrate to form a thin film. Electrochemical deposition involves the reduction of metal ions at a cathode to form a metal deposit.