抄録
We report the simple preparation of highly aligned metal nanoparticle arrays comprised of Au nanoparticles 30 nm in diameter and their microscopic analysis. The prepared arrays were a hundred nanometers wide and millimeters long. This technique, which is based on the process of evaporation-induced self-assembly with DNA and drying front movement, eliminates the need for lithography and an external field, and is fast, cheap and easy. A combination of dark-field microscopy and microspectroscopy were used to study the optical characteristics of the arrays. Higher optical responses were observed in the arrays when the light was polarized parallel to the arrays, indicating a uniaxial alignment of Au nanoparticles along the arrays. Optical properties of arrays observed in this study were satisfactorily explained by theoretical calculations reported in the other study, and the morphology of the arrays was characterized by scanning electron microscopy (SEM). Our results demonstrate the use of evaporation-induced self-assembly with DNA as a straightforward method to align metal particle arrays, producing highly anisotropic coupling of localized plasmon.
