银纳米颗粒结晶形态形成机理研究

Study on the Crystalline Morphology Formation of Silver Nanoparticle

从结晶学的角度探讨了银纳米晶体形成的机理:银纳米晶体生长过程遵循布拉维法则,对比了银纳米晶体的立方面心格子主要面网密度应为(111)>(200)>(110)>(100)。以银的单一晶胞为基本单元,分析了银纳米结晶形态的变化趋势:优先生长为四面体(八面体),立方体;常形成立方体、八面体与菱形十二面体,正负四面体与立方面体,八面体与立方体、菱形十二面体的聚形;以及多种银纳米尺度的结晶形态可共存。

The formation mechanism of silver nanoparticle was discussed in terms of crystallography： the growth of silver nanoparticle adapts to Bravis rule.The high lattice network densities of silver are（111）,（200）,（110） and（100）.It is analyzed that the variation growth tendency of silver crystalline morphologies based on silver unit cell： octahedron and tetrahedron firstly,and then cube;the morphologies of cube,octahedron and granatohedron,plus-minus tetrahedron and cube are commonly,combinate form of octahedron,cube and granatohedron;and coexist with different morphologies of silver nanoparticle.