Loading...
Please wait, while we are loading the content...
Similar Documents
Graphene Oxide-Coated Metal–Insulator–Metal SERS Substrates for Trace Melamine Detection
| Content Provider | MDPI |
|---|---|
| Author | Wang, Zhenming Liu, Jianxun Wang, Jiawei Ma, Zongjun Kong, Delai Jiang, Shouzhen Luo, Dan Liu, Yan Jun |
| Copyright Year | 2022 |
| 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 $SiO_{2}$/Au/Si substrate. A seconds-lasting etching process of a self-assembled nanosphere mask manipulates the geometry of the deposited Ag metasurface on the $SiO_{2}$/Au/Si substrate, which attains the wavelength matching between the optical absorbance of the $Ag/SiO_{2}$/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 × $10^{5}$ analytical enhancement factor and a limit of detection of $10^{−9}$ 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. |
| Starting Page | 1202 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12071202 |
| Journal | Nanomaterials |
| Issue Number | 7 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-04-03 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Spectroscopy Sers Self-assembly Metasurface Surface Plasmon Hot Spot Sensitivity |
| Content Type | Text |
| Resource Type | Article |
