Optical and Dynamical Properties of Chemically Synthesized Gold Nanoplates
Optical and Dynamical Properties of Chemically Synthesized Gold Nanoplates
复制标题
DOI：
10.1021/jp311470t
复制
发表时间：
2013-01-24
影响因子：
3.7
通讯作者：
Hartland, Gregory V.
中科院分区：
文献类型：
--
作者：
Major, Todd A.;Devadas, Mary Sajini;Hartland, Gregory V.
单晶，微米大小的纳米板是通过还原Au（III）在表面活性剂的存在下，使用改进的多元醇协议。盘子的形状从三角形到六边形不等。纳米片的表面平均边缘长度为5 +/- 2 μ m，平均宽度为107 +/- 30 nm。扫描电子显微镜（SEM）图像显示，板生长通过一个重新进入槽产生的孪生。通过散射光和瞬态吸收实验研究了该板的光学特性。散射光测量结果表明，当激光束聚焦在金纳米板的边缘时，可以激发金纳米板的表面等离子激元（SPP）模式。我们还证明了SPP模式的传播方向可以通过激光束的偏振来控制。单个悬浮纳米板的瞬态吸收轨迹显示振荡，这归因于板的厚度振动。振荡的质量因子比最近测量的悬浮金纳米线的质量因子要小，这表明表面结合的分子或晶体结构可能对振动阻尼有贡献。
Single crystal, micrometer-sized nanoplates were formed by reducing Au(III) in the presence of surfactants using a modified polyol protocol. The shapes of the plates range from triangular to hexagonal. The nanoplates have {111} surfaces with an average edge length of 5 +/- 2 mu m and an average width of 107 +/- 30 nm. Scanning electron microscopy (SEM) images reveal that the plates grow through a re-entrant groove created by twinning. The optical properties of the plates were studied by scattered light and transient absorption experiments. The scattered light measurements show that propagating surface plasmon polariton (SPP) modes of the Au nanoplates can be excited when a laser beam is focused at the edge of the nanoplate. We also demonstrate that the direction of propagation of the SPP modes can be controlled through the polarization of the laser beam The transient absorption traces for single suspended nanoplates show oscillations, which are assigned to thickness vibrations of the plates. The quality factors for the oscillations are smaller than those recently measured for suspended gold nanowires, indicating possible contributions to the vibrational damping from surface bound molecules or from the crystal structure.