通过柠檬酸钠还原银离子,以银纳米粒子为种子,在室温下制备出平均厚度约为5nm,尺寸40到500nm可调的三角形银纳米片。通过种子调停法可实现银纳米盘的面内偶极表面等离子体共振峰(SPR)从最初的520nm红移至1100nm。通过控制实验参数能够很好地理解其生长机制。柠檬酸根离子和增加到生长液里面的银纳米种子是2个重要的参数,可以控制银纳米盘的大小却不改变银纳米盘的厚度以及晶面结构。采用PVP作为包覆剂,其作用机理还不是很清楚,需要进一步的研究。 The silver ions were reduced by sodium citrate and silver nanoparticles were used as seeds to prepare triangular silver nanosheets with an average thickness of about 5 nm and a size of 40 to 500 nm at room temperature. The in-plane dipole surface plasmon resonance (SPR) of silver nanodisks can be red-shifted from the original 520nm to 1100nm by seed-mediated method. The mechanism of growth can be well understood by controlling the experimental parameters. Citrate ions and silver nanoparticles added to the growth solution are two important parameters that can control the size of the silver nanodisk without changing the thickness and the crystal structure of the silver nanodisk. The use of PVP as a coating agent, the mechanism is not yet clear, need further study.