Yu Renpeng, Wang Jingyu, Han Mei, Zhang Mengyao, Zeng Pei, Dang Weiqi, Liu Jianfang, Yang Zhilin, Hu Jiawen, Tian Zhongqun
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory of Two-Dimensional Materials, and College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Department of Physics, Research Institute for Biomimetics and Soft Matter, Xiamen University, Xiamen 361005, China.
ACS Omega. 2020 Apr 2;5(14):8293-8298. doi: 10.1021/acsomega.0c00698. eCollection 2020 Apr 14.
The dependence of plasmon resonance on the size, shape, and interparticle spacing of single, isolated nanostructures inherently limits their light-harvesting capability to a narrow spectral band. Here, we report a facile overcurrent electrodeposition strategy to prepare fractal plasmonic black gold (B-Au) with broad-band absorption properties (over 80% throughout the range of 300-1800 nm). The broad-band absorption properties are attributed to the excitation of multiple plasmons in the B-Au, which results in strong light-matter interaction over a broad-band spectral window. Consequently, the B-Au can produce strong broad-band surface-enhanced Raman scattering (SERS) regardless of the excitation light used. These findings demonstrate that the fractal B-Au allows efficient utilization of broad spectral photons and opens up exciting opportunities for highly sensitive SERS detection, photocatalysis, and photovoltaic devices.
表面等离子体共振对单个孤立纳米结构的尺寸、形状和粒子间间距的依赖性，本质上限制了它们在窄光谱带内的光捕获能力。在此，我们报告了一种简便的过电流电沉积策略，用于制备具有宽带吸收特性（在300 - 1800 nm范围内吸收率超过80%）的分形等离子体黑金（B - Au）。宽带吸收特性归因于B - Au中多个等离子体的激发，这导致在宽带光谱窗口内有强烈的光与物质相互作用。因此，无论使用何种激发光，B - Au都能产生强烈的宽带表面增强拉曼散射（SERS）。这些发现表明，分形B - Au能够高效利用宽光谱光子，并为高灵敏度SERS检测、光催化和光伏器件带来了令人兴奋的机遇。
