Kan Caixia, Zhu Xiaoguang, Wang Guanghou
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, PR China.
J Phys Chem B. 2006 Mar 16;110(10):4651-6. doi: 10.1021/jp054800d.
Single-crystalline gold microplates of several 10 microm in lateral size, characterized by hexagonal, truncated triangular, and triangular shapes with (111) planes as two basal surfaces, have been synthesized in large quantities through a solution phase process. Significantly, such anisotropic Au nanostructures exhibit remarkable optical properties, in which the dipole plasmon resonance shifting in the NIR region and the quadrupole plasmon resonance at approximately 820 nm were observed. Fragmentation of Au microplates is found when the temperature is higher than 450 degrees C, indicating they are not thermodynamically stable structure at high temperature. Investigations on the Au microplates upon heating suggest that the melting and collapsing start mainly at the edges that should be Au (110) facets. This work is valuable for Au nanostructures applied at elevated temperatures.
通过溶液相法大量合成了横向尺寸为几十微米的单晶金微板，其形状为六边形、截顶三角形和三角形，以（111）面作为两个基面。值得注意的是，这种各向异性的金纳米结构表现出显著的光学特性，其中观察到偶极子等离子体共振在近红外区域移动，以及在约820nm处的四极子等离子体共振。当温度高于450℃时发现金微板会破碎，这表明它们在高温下不是热力学稳定结构。对加热后的金微板的研究表明，熔化和坍塌主要从应为金（110）面的边缘开始。这项工作对于在高温下应用的金纳米结构具有重要价值。
