Recyclable Ag-TiO₂ SERS Substrates Fabricated via Plasma Jet Printing

Recyclable surface-enhanced Raman scattering (SERS) substrates are important for real-world use because they can be used multiple times and are affordable. In this study, we developed a simple and low-cost method for fabricating recyclable SERS substrates by depositing silver nanoparticles onto TiO₂ nanostructures using an atmospheric pressure plasma jet without the need for chemical reducing or stabilizing agents. TiO₂ nanoparticles were synthesized via a sol-gel process and drop-cast onto glass substrates, followed by silver nanoparticle deposition through plasma jet printing. Structural analyses using XRD and FESEM confirmed the formation of anatase-phase TiO₂ and spherical Ag nanoparticles with tunable density. The SERS activity was optimized at a ۶۰ s deposition time, and the substrates demonstrated strong plasmonic response and excellent reusability over five UV-assisted photocatalytic cleaning cycles using Rhodamine B and Methylene Blue. The substrates maintained over ۸۰% of their initial Raman signal intensity, with no cross-contamination observed between analytes.  These results show that the Ag-TiO₂ substrates are very sensitive, stable, and can be reused, making them a practical option for real-world SERS applications.

کلیدواژه ها:

Recyclable ، Surface-Enhanced Raman Scattering (SERS) ، Ag-TiO۲ Nanocomposite ، Plasma Jet