Anisotropic Au nanostructures have been heavily pursued in recent years due to the energetic and optical phenomena which they generate. Generally, increasing anisotropy yields greater intensities of such events, e.g. Surface-Enhanced Raman Scattering (SERS). SERS is an energetic phenomenon that enables the detection of analytes in Raman spectroscopy at pico- and nano-molar concentrations by adsorbing an analyte to the surface of a metallic nanoparticle, such a method being used in the detection of molecules that are extremely potent in low quantities, such as environmental toxins or early detection of diseases through biomarkers. It thus becomes of great value to gain the most anisotropy for the minimal resources used to create practical and powerful aides in molecular spectroscopy. Herein, we propose the fabrication of highly anisotropic Au nanostructures from a simple smooth Au nanoplate through quick plasma-dependent reshaping of the Au {111} surface to create pyramidal undulations. Due to a large number of theoretical hotspots now present at the surface of the plasmonic nanostructure, the SERS enhancement must greatly increase. We further provide an in-depth SERS analysis in both liquid and solid phases to determine the strength of these SERS substrates, as well as various characterizations to further elucidate the properties of these substrates.

High-yield plasma-dependent fabrication of efficient surface-enhanced Raman scattering undulated Au nanoplates

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