Facile preparation of nanoparticle based SERS substrates for trace molecule detection

Date

2020-10-01

Author

Demirta, Ozge
Doğanay, Doğa
Öztürk, İbrahim Murat
Ünalan, Hüsnü Emrah
Bek, Alpan

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In this work, we demonstrate that a polished Si wafer surface can be converted to possess strong surface-enhanced Raman scattering (SERS) activity by spray coating of polyol synthesized colloidal silver nanoparticles (AgNPs) at as low as 1% surface coverage. The SERS activity assays of substrate surfaces prepared with different production procedures (spray and spin coating) at different surface coverages are realized using population statistics. The resulting Raman enhancement factors (EFs) are discussed with the help of distance-dependent electromagnetic simulations for single particles and dimers. Statistics on the SERS effect and the corresponding EF calculations show that polyol synthesized AgNPs exhibit extremely strong SERS activity with EFs up to 10(8)at as low as 1% surface coverage. We discuss in this work that this is possible due to the distinct properties of polyol synthesized AgNPs such as atomically flat surfaces, sharp edges and corners naturally occurring in this synthesis method, which favor strong plasmonic activity. The method can be generalized to convert virtually any surface into a SERS substrate.

Subject Keywords

Physical and Theoretical Chemistry, General Physics and Astronomy

URI

https://hdl.handle.net/11511/56808

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

DOI

https://doi.org/10.1039/d0cp01866j

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

O. Demirta, D. Doğanay, İ. M. Öztürk, H. E. Ünalan, and A. Bek, “Facile preparation of nanoparticle based SERS substrates for trace molecule detection,” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, pp. 21139–21146, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56808.