Graphene Oxide-Coated Metal-Insulator-Metal SERS Substrates for Trace Melamine Detection

Surface-enhanced Raman spectroscopy (SERS) has long been an ultrasensitive technique for trace molecule detection. However, the development of a sensitive, stable, and reproducible SERS substrate is still a challenge for practical applications. Here, we demonstrate a cost-effective, centimeter-sized...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-04, Vol.12 (7), p.1202
Main Authors: Wang, Zhenming, Liu, Jianxun, Wang, Jiawei, Ma, Zongjun, Kong, Delai, Jiang, Shouzhen, Luo, Dan, Liu, Yan Jun
Format: Article
Language:English
Subjects:
Environmental monitoring
Etching
Food products
Food safety
Gold
Graphene
hot spot
Lasers
Melamine
metasurface
Nanoparticles
Nanospheres
Radiation
Raman spectroscopy
Self-assembly
sensitivity
SERS
Silicon dioxide
Silicon substrates
Silver
Spectrum analysis
Spin coating
Substrates
surface plasmon
Wavelength
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Summary:Surface-enhanced Raman spectroscopy (SERS) has long been an ultrasensitive technique for trace molecule detection. However, the development of a sensitive, stable, and reproducible SERS substrate is still a challenge for practical applications. Here, we demonstrate a cost-effective, centimeter-sized, and highly reproducible SERS substrate using the nanosphere lithography technique. It consists of a hexagonally packed Ag metasurface on a SiO /Au/Si substrate. A seconds-lasting etching process of a self-assembled nanosphere mask manipulates the geometry of the deposited Ag metasurface on the SiO /Au/Si substrate, which attains the wavelength matching between the optical absorbance of the Ag/SiO /Au/Si substrate and the excitation laser wavelength as well as the enhancement of Raman signals. By spin-coating a thin layer of graphene oxide on the substrate, a SERS performance with 1.1 × 10 analytical enhancement factor and a limit of detection of 10 M for melamine is achieved. Experimental results reveal that our proposed strategy could provide a promising platform for SERS-based rapid trace detection in food safety control and environmental monitoring.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12071202