Thermally generated Au–Ag nanostructures with tunable localized surface plasmon resonance as SERS activity substrates

Jialin Ji; Zhengwang Li

Heliyon (Jul 2023)

Thermally generated Au–Ag nanostructures with tunable localized surface plasmon resonance as SERS activity substrates

Jialin Ji,
Zhengwang Li

Affiliations

Jialin Ji: Tongda College of Nanjing University of Post and Telecommunications, No. 33 South of Runyang Road, Yangzhou 225127, People's Republic of China; Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jun Gong Road, Shanghai 200093, People's Republic of China; Corresponding author. Tongda College of Nanjing University of Post and Telecommunications, No. 33 South of Runyang Road, Yangzhou 225127, People's Republic of China.
Zhengwang Li: Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jun Gong Road, Shanghai 200093, People's Republic of China

Journal volume & issue: Vol. 9, no. 7
p. e17749

Abstract

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Various Au–Ag bimetallic alloy nanostructures were obtained as sensitive surface-enhanced Raman scattering (SERS) substrates by changing the thermal annealing sequence. The atomic force microscopy (AFM) and scanning electron microscopy (SEM) results confirm that Au/Ag bimetallic clusters and Ag–Au core-shell like structures can be designed by thermal annealing. The absorption spectra showed that the localized surface plasmon resonance (LSPR) frequency of the annealed Au/Ag bimetallic alloy structure could effectively shift from the near ultraviolet to the visible region. At the same time, the Au/Ag bimetallic alloy films modified by thermal annealing have shown satisfactory performance as SERS substrates. Raman enhancement mechanism of Au–Ag bimetallic alloy films is verified by finite-difference time-domain (FDTD) simulation results.

Published in Heliyon

ISSN: 2405-8440 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Science (General); Social Sciences: Social sciences (General)
Website: https://www.cell.com/heliyon/home

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