Department of Materials Science and Engineering , Korea University , Anam-dong 5-1, Sungbuk-Ku, Seoul 136-701 , Republic of Korea.
ICT Materials & Components Research Laboratory , ETRI , Daejeon 305-700 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Aug 1;10(30):25652-25659. doi: 10.1021/acsami.8b07454. Epub 2018 Jul 18.
We developed a simple and systematic method to fabricate optically tunable and thermally and chemically stable Au-Ag nanocrystal-based plasmonic metamaterials. An Ag nanocrystal-based metamaterial with desirable optical properties was fabricated via nanoimprinting and ligand-exchange process. Its optical properties were controlled by selectively substituting Ag atoms with Au atoms through a spontaneous galvanic replacement reaction. The developed Au-Ag-based metamaterials provide excellent tunable plasmonic properties required for various applications in the visible and near-infrared regions by controlling the Au-Ag composition according to the conditions of the galvanic displacement. Furthermore, their thermal and chemical stabilities significantly improved because of the protective Au thin layer on the surface. Using this developed process, chemically and thermally stable and flexible plasmonic metamaterials were successfully fabricated on a flexible polyester terephthalate substrate.
我们开发了一种简单而系统的方法来制造光学可调谐、热稳定和化学稳定的基于 Au-Ag 纳米晶的等离子体超材料。通过纳米压印和配体交换工艺制造了具有理想光学性能的基于 Ag 纳米晶的超材料。通过自发的电置换反应，选择性地用 Au 原子取代 Ag 原子，从而控制其光学性质。所开发的基于 Au-Ag 的超材料通过根据电置换条件控制 Au-Ag 组成，为在可见光和近红外区域的各种应用提供了所需的可调谐等离子体性能。此外，由于表面的 Au 薄保护层，其热稳定性和化学稳定性得到了显著提高。使用这种开发的工艺，成功地在柔性聚酯 terephthalate 基底上制造了化学和热稳定且灵活的等离子体超材料。
