Nano silver is a kind of nano-level silver particles,with small size,big surface area,strong chemical reactivity,and excellent antibacterial properties.It can be widely used in fields such as medicine,food and the environment.The preparation methods of silver nanoparticles include chemical reduction method,vapor deposition method,sol-gel method,electrochemical method,biological reduction method and plant re-duction method.The preparation method and supported application of nano silver were reviewed.Biological preparation was a green and efficient method,and the morphology control of nano silver in the future was the next research focus.
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