Pander Adam, Onishi Takatsugu, Hatta Akimitsu, Furuta Hiroshi
Electronic and Photonic Systems Engineering, Department of Engineering, Graduate School of Engineering, Kochi University of Technology, Tosayamada, Kami City 782-8502, Kochi, Japan.
Center for Nanotechnology, Research Institute, Kochi University of Technology, Tosayamada, Kami City 782-8502, Kochi, Japan.
Nanomaterials (Basel). 2022 Jan 28;12(3):464. doi: 10.3390/nano12030464.
The investigation of the preparation of polystyrene (PS) nanosphere monolayers for the fabrication of carbon nanotube (CNT) forest fishnet metamaterial structures is studied in this paper, as a cheap alternative for top-down patterning methods. The precise control of dry etching conditions resulted in a highly controlled diameter of PS nanobeads, which were then used as a shadow mask for CNT fishnet preparation. The change of the size of the holes from 370 nm to 665 nm resulted in a gradual change of the CNT morphology from multi-walled to single-walled CNTs. The ultraviolet-visible (UV-Vis) reflectance spectra showed that the variation of the hole diameter resulted in the nonlinear light absorption in CNT fishnets that caused the change of the resonance frequency. The change of the fishnet wire width (inductance) and the hole size (capacitance) resulted in the blueshift of the broadband resonance frequency peak. The presented work has a significant potential to allow for the large-scale fabrication of CNT-based fishnet metamaterial structures for applications in energy harvesting, energy storage, solar cells, or optoelectronic devices, such as neuromorphic networks.
本文研究了用于制造碳纳米管（CNT）森林渔网超材料结构的聚苯乙烯（PS）纳米球单层的制备，作为自上而下图案化方法的廉价替代方案。干法蚀刻条件的精确控制导致了PS纳米珠直径的高度可控，然后将其用作制备CNT渔网的荫罩。孔尺寸从370nm变化到665nm导致CNT形态从多壁逐渐变为单壁CNT。紫外可见（UV-Vis）反射光谱表明，孔径的变化导致CNT渔网中的非线性光吸收，从而引起共振频率的变化。渔网线宽（电感）和孔尺寸（电容）的变化导致宽带共振频率峰值的蓝移。所展示的工作对于大规模制造基于CNT的渔网超材料结构具有巨大潜力，可应用于能量收集、能量存储、太阳能电池或诸如神经形态网络等光电器件。
