光学技术, 2019, 45 (3): 288, 网络出版: 2019-08-07  

利用表面等离子体共振效应确定金纳米棒的尺寸

Determination of the size of gold nanorods using surface plasmon resonance
作者单位
黑龙江大学 电子工程学院,  黑龙江 哈尔滨 150080
摘要
金属纳米粒子的尺寸和形状对其物理和化学性质有很大影响, 通常利用昂贵的透射电子显微镜和扫描电子显微镜进行其尺寸测量。为了节约测量成本, 利用时域有限差分法研究了金纳米棒的尺寸与吸收峰的对应关系得到间接的测量方法。即当金纳米棒的纵横比增大时, 横向等离子峰几乎没有变化, 纵向等离子峰出现明显的红移, 且红移速度随着金纳米棒半径的增大而增大。实际制备了两种不同尺寸的金纳米棒样品, 通过理论模拟确定的金纳米棒的尺寸与利用透射电子显微镜测量的金纳米棒的尺寸符合的很好。
Abstract
The size and shape of metal nanoparticles have great influence on their physical and chemical properties. Usually, the size is measured by using expensive transmission electron microscope and scanning electron microscope. The relationship between the size of gold nanorods and the absorption peak is studied by using the finite difference time domain method. The results show that the transverse plasma peak of gold nanorods does not change obviously and the longitudinal plasmon peaks red shifts obviously when the aspect ratio of gold nanorods increases. There is a linear relationship between the longitudinal plasma peak and the aspect ratio of the gold nanorods, moreover, the red shifts velocity of the longitudinal plasma peak increase with the increase of the radius of gold nanorods. Thus, the size of gold nanorods can be indirectly determined by theoretical simulation. Two kinds of gold nanorods with different sizes have been prepared. The size of the gold nanorods determined by theoretical simulation is in good agreement with that measured by transmission electron microscope (TEM).

陈爽, 高亚臣. 利用表面等离子体共振效应确定金纳米棒的尺寸[J]. 光学技术, 2019, 45(3): 288. CHEN Shuang, GAO Yachen. Determination of the size of gold nanorods using surface plasmon resonance[J]. Optical Technique, 2019, 45(3): 288.

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