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...
| Published in: | Nanomaterials |
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| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/2079-4991/12/7/1202 |
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| author | Zhenming Wang Jianxun Liu Jiawei Wang Zongjun Ma Delai Kong Shouzhen Jiang Dan Luo Yan Jun Liu |
| author_facet | Zhenming Wang Jianxun Liu Jiawei Wang Zongjun Ma Delai Kong Shouzhen Jiang Dan Luo Yan Jun Liu |
| author_sort | Zhenming Wang |
| collection | DOAJ |
| container_title | Nanomaterials |
| description | 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<sub>2</sub>/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<sub>2</sub>/Au/Si substrate, which attains the wavelength matching between the optical absorbance of the Ag/SiO<sub>2</sub>/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<sup>5</sup> analytical enhancement factor and a limit of detection of 10<sup>−9</sup> 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. |
| format | Article |
| id | doaj-art-fac3187bbcce4e2f8331e764cb8a7192 |
| institution | Directory of Open Access Journals |
| issn | 2079-4991 |
| language | English |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| spelling | doaj-art-fac3187bbcce4e2f8331e764cb8a71922025-08-19T23:19:53ZengMDPI AGNanomaterials2079-49912022-04-01127120210.3390/nano12071202Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine DetectionZhenming Wang0Jianxun Liu1Jiawei Wang2Zongjun Ma3Delai Kong4Shouzhen Jiang5Dan Luo6Yan Jun Liu7Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaProvincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaSurface-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<sub>2</sub>/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<sub>2</sub>/Au/Si substrate, which attains the wavelength matching between the optical absorbance of the Ag/SiO<sub>2</sub>/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<sup>5</sup> analytical enhancement factor and a limit of detection of 10<sup>−9</sup> 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.https://www.mdpi.com/2079-4991/12/7/1202SERSself-assemblymetasurfacesurface plasmonhot spotsensitivity |
| spellingShingle | Zhenming Wang Jianxun Liu Jiawei Wang Zongjun Ma Delai Kong Shouzhen Jiang Dan Luo Yan Jun Liu Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection SERS self-assembly metasurface surface plasmon hot spot sensitivity |
| title | Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection |
| title_full | Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection |
| title_fullStr | Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection |
| title_full_unstemmed | Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection |
| title_short | Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection |
| title_sort | graphene oxide coated metal insulator metal sers substrates for trace melamine detection |
| topic | SERS self-assembly metasurface surface plasmon hot spot sensitivity |
| url | https://www.mdpi.com/2079-4991/12/7/1202 |
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