School of Chemistry, Seoul National University, Seoul, Republic of Korea.
J Sep Sci. 2009 Dec;32(23-24):4161-6. doi: 10.1002/jssc.200900442.
The shape transformation of silver triangular nanoplates induced by nanosecond laser pulses has been monitored using agarose gel electrophoresis as well as optical spectroscopy and electron microscopy. Laser irradiation truncates the vertices of the triangular nanoplates, having an average edge size of 110 nm and an average thickness of 14 nm, to form nearly regular-hexagonal and spherical silver nanoplates gradually. The surface-enhanced Raman scattering of 4-nitrobenzenethiol absorbed on silver nanoparticles has been found to decrease enormously with laser irradiation, showing its strong dependence on the shape transformation of nanostructures. Electrophoretic mobility values have been found to decrease substantially with the increase of irradiation time, indicating that the surface charge density of silver nanoplates has been modified largely by laser pulses.
采用琼脂糖凝胶电泳、光学光谱和电子显微镜监测了纳秒激光脉冲诱导的银三角纳米板的形状转变。激光辐照会逐渐将平均边长为 110nm、平均厚度为 14nm 的三角纳米板的顶点截断，形成近乎规则的六方和球形银纳米板。发现吸附在银纳米粒子上的 4-硝基苯硫醇的表面增强拉曼散射随着激光辐照而大大降低，表明其强烈依赖于纳米结构的形状转变。电泳迁移率值随着辐照时间的增加而显著降低，表明激光脉冲极大地改变了银纳米板的表面电荷密度。
