Roper D Keith, Kim Jin-Woo, Romo Ricardo R, Batta-Mpouma Joseph
Utah State University, Logan, UT 84322 USA.
University of Arkansas, Fayetteville, AR. 72701.
IEEE Open J Nanotechnol. 2024;5:47-56. doi: 10.1109/ojnano.2024.3437164. Epub 2024 Aug 5.
Enhanced optical and infrared activity of subwavelength metal nanoparticles is key to their use in optoelectronics, spectroscopy, and sensing. The present work compared spectra of nanosphere dimers merged by centrifuging gold nanospheres with corresponding simulated nanoscale dimers. Geometric features of the nanosphere dimers were related to corresponding optical and near-infrared activity through simulation. Differences in optical and infrared activity of the nanosphere dimers were largely attributable to changes in the radius of the nanosphere and the radius of the conductive junction between merged nanospheres. The features observed in the experimental spectra were attributed to a select number of dimers exhibiting predominantly optical and infrared activity, consistent with observations made in the corresponding transmission electron microscope image. The preparation and simulation methods in the present work appear useful to guide design, fabrication, and implementation of sustainably-synthesized nanosphere dimers with desired optical features for optoelectronic, spectroscopic, and sensing applications.
亚波长金属纳米粒子增强的光学和红外活性是其在光电子学、光谱学和传感领域应用的关键。本研究将通过离心金纳米球合并而成的纳米球二聚体的光谱与相应的模拟纳米级二聚体进行了比较。通过模拟，纳米球二聚体的几何特征与相应的光学和近红外活性相关。纳米球二聚体光学和红外活性的差异很大程度上归因于纳米球半径以及合并纳米球之间导电结半径的变化。实验光谱中观察到的特征归因于少数主要表现出光学和红外活性的二聚体，这与在相应的透射电子显微镜图像中观察到的结果一致。本研究中的制备和模拟方法似乎有助于指导设计、制造和实现具有所需光学特性的可持续合成纳米球二聚体，用于光电子、光谱和传感应用。
