Toward the Limitation of Dealloying: Full Spectrum Responsive Ultralow Density Nanoporous Gold for Plasmonic Photocatalytic SERS

Jinglin Huang; Cuilan Tang; Guo Chen; Zhibing He; Tao Wang; Xiaoshan He; Taimin Yi; Yansong Liu; Ling Zhang; Kai Du

doi:10.1021/acsami.0c20766

Toward the Limitation of Dealloying: Full Spectrum Responsive Ultralow Density Nanoporous Gold for Plasmonic Photocatalytic SERS

ACS Appl Mater Interfaces. 2021 Feb 17;13(6):7735-7744. doi: 10.1021/acsami.0c20766. Epub 2021 Feb 3.

Authors

Jinglin Huang¹, Cuilan Tang¹, Guo Chen¹, Zhibing He¹, Tao Wang¹, Xiaoshan He¹, Taimin Yi¹, Yansong Liu¹, Ling Zhang², Kai Du¹

Affiliations

¹ Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, P. R. China.
² Sichuan Co-Innovation Center for New Energetic Material, Southwest University of Science and Technology, Mianyang 621010, P. R. China.

PMID: 33533584
DOI: 10.1021/acsami.0c20766

Abstract

Plasmon-mediated chemical reaction has a great potential to create self-cleaning surface-enhanced Raman scattering (SERS) substrates. However, few works have been reported to promote this goal. Here, we report ultralow density nanoporous gold (ULDNPG) that possesses an impressive full spectrum responsive characteristic with a reflectivity lower than 5% in the waveband of 300-900 nm. ULDNPG was fabricated by a sandwich dealloying strategy from ultradilute Au-Ag solid solutions with the Au content as low as 1-5 at.%. The prepared ULDNPG presents excellent SERS properties, including high sensitivity, high uniformity, and reproducibility. The full spectrum responsive characteristic of ULDNPG leads to an obvious plasmonic photocatalytic activity. The short lifetime of the SP-excited hot carriers causes a restricted self-cleaning SERS property and a strong photothermal effect for ULDNPG structures.

Keywords: dealloying; full spectrum response; plasmonic photocatalysis; surface enhanced Raman scattering; ultralow density nanoporous gold.