Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 868, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159136
Keywords
Au-Ag bimetallic nanoparticles; Silicon nanowires; Dynamic hot spots; 3D SERS
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Funding
- National Natural Science Foundation of China [31870078]
- introduction of talent research start-up fund of Chengdu University [2081920038]
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The article reports a facile method to fabricate Au-Ag bimetallic nanoparticles decorated silicon nanowires as 3D SERS substrates, and investigates the effects of Au-Ag bimetallic nanoparticles size and composition ratios on SERS performance through experiments and theoretical simulations. The prepared 3D SERS substrate shows higher SERS enhancement factor and oxidation resistance ability, making it potentially suitable for ultrasensitive detection of trace analytes.
Three-dimensional (3D) SERS substrates have being intensively investigated since they can afford sub-stantial hot spots and trap targets exponentially, silicon nanowires (SiNWs) array is a promising candidate due to its facile preparation. Most often, the SiNWs based substrates were decorated with pure Ag or Au nanoparticles (NPs), Au-Ag bimetallic NPs (BMNPs) with superior plasmonic properties and stabilities are rarely studied for the fabrication of SiNWs based SERS substrates. In this work, we reported a facile method to fabricate Au-Ag BMNPs decorated SiNWs as 3D SERS substrates, the effects of Au-Ag BMNPs scale and composition ratios on SERS performance were well investigated through experiments and theoretical simulations. The vertically aligned SiNWs coated with dense Au-Ag BMNPs further improved the sensitivity by forming fixed and dynamic hot spots, and the detection limit of R6G on SiNWs-AuAg can be as low as 10-12 M by using a portable Raman spectroscopy. Meanwhile, the prepared 3D SERS substrate showed a higher SERS enhancement factor (EF) and oxidation resistance ability due to the synergistic effect of Au and Ag atoms in Au-Ag BMNPs. Considering the facile fabrication process and excellent performances, the prepared 3D SERS substrate can be potentially applied for ultrasensitive detection of trace analytes. (C) 2021 Elsevier B.V. All rights reserved.
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