Overcurrent Electrodeposition of Fractal Plasmonic Black Gold with Broad-Band Absorption Properties for Excitation-Immune SERS

Renpeng Yu; Jingyu Wang; Mei Han; Mengyao Zhang; Pei Zeng; Weiqi Dang; Jianfang Liu; Zhilin Yang; Jiawen Hu; Zhongqun Tian

doi:10.1021/acsomega.0c00698

Overcurrent Electrodeposition of Fractal Plasmonic Black Gold with Broad-Band Absorption Properties for Excitation-Immune SERS

ACS Omega. 2020 Apr 2;5(14):8293-8298. doi: 10.1021/acsomega.0c00698. eCollection 2020 Apr 14.

Authors

Renpeng Yu¹, Jingyu Wang², Mei Han¹, Mengyao Zhang¹, Pei Zeng³, Weiqi Dang¹, Jianfang Liu¹, Zhilin Yang², Jiawen Hu¹, Zhongqun Tian⁴

Affiliations

¹ 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.
² Department of Physics, Research Institute for Biomimetics and Soft Matter, Xiamen University, Xiamen 361005, China.
³ School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China.
⁴ State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, Xiamen University, Xiamen 361005, China.

Abstract

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.