Hyperbolic Metamaterials Fabricated Using 3D Assembled Nanorod Arrays and Enhanced Photocatalytic Performance
Hyperbolic Metamaterials Fabricated Using 3D Assembled Nanorod Arrays and Enhanced Photocatalytic Performance
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使用 3D 组装纳米棒阵列制造双曲超材料并增强光催化性能
DOI：
10.1002/adom.202100778
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发表时间：
2021-09
影响因子：
9
通讯作者：
Wang Yongsheng
中科院分区：
文献类型：
--
作者：
Li Caixia;Liu Jiatong;Wu Zheli;Chen Zhe;Jiang Jingwen;Dou Zhengkang;Liu Xiaoyu;Fu Ming;He Dawei;Wang Yongsheng
开发一种用于光学超材料的三维胶体组装方法具有重要的意义，但也具有挑战性。具有三维多孔周期形态的双曲线超材料(HMM)适合于负载能量采集和生物传感的功能元件，并提供可调范围的无限介电常数。在本研究中，由定向组装的二氧化硅纳米棒与金属的共形涂层构建了具有3D周期性的多孔HMM。可见光波长附近的不确定介电范围是由沿不同方向的各向异性几何感生的各向异性有效介电常数形成的，并可根据杆长、杆径和金属涂层厚度进行调节。在有入射光束的显微镜-光谱系统中，利用部分光束与全光束之间的透过率验证了棒阵超材料的负折射。与胶体球体组装结构相比，棒状超材料在近紫外光和可见光波段表现出更高的光吸收。负载二氧化钛的多孔型HMMS具有更好的光吸收和光催化性能。用180-190次原子层沉积循环的二氧化钛和8-9分钟的银沉积的结构具有最好的性能。
It is significant but challenging to develop a 3D colloidal assembly method for optical metamaterials. Hyperbolic metamaterials (HMMs) with 3D porous periodic morphologies are suitable for loading functional components for energy harvesting and biosensing and for providing a tunable range of indefinite permittivity. In this study, porous HMMs with 3D periodicities are constructed from directionally assembled silica nanorods with conformal coating of metal. The indefinite dielectric ranges around visible wavelength are formed from the anisotropic geometry induced anisotropic effective permittivity along different directions and are tunable according to the rod length, rod diameter, and thickness of metal coating. The negative refraction of rod array based metamaterials is verified using the transmission ratio between the part beam and full beam in microscope–spectrum system with incident light beam. The rod‐based metamaterials show a higher optical absorption in near‐ultraviolet and visible wavelengths than the compared colloidal sphere assembled structures. The porous HMMs loaded with TiO2 can provide enhanced optical absorption and photocatalytic performances. The structures coated with 180–190 atomic‐layer‐deposition cycles of TiO2 and 8–9 min deposition of silver provide the best performance.
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