Ultrasensitive 3D SERS substrate of poly(DEGDMA-GMA) microparticles decorated with silver nanoparticles

Mahmood, Malik H. and Beiler, Barbara and Péter, László and Veres, Miklós (2026) Ultrasensitive 3D SERS substrate of poly(DEGDMA-GMA) microparticles decorated with silver nanoparticles. OPTICAL MATERIALS, 169. No. 117606. ISSN 0925-3467

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Abstract

A three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate was fabricated as an array of poly (diethylene glycol dimethacrylate - glycidyl methacrylate) [poly(DEGDMA-GMA)] microparticles synthesized via gamma radiation-initiated polymerization technique and decorated with silver nanoparticles (AgNPs). The morphological characterization of the substrate showed a highly uniform distribution of the AgNPs on the microparticle surface. Two localized surface plasmon resonance peaks were observed in the optical absorption spectrum of the array, corresponding to standalone and assembled nanoparticles. The evaluation of the SERS performance showed a 10-11 M detection limit for Rhodamine 6G, and a SERS analytical enhancement factor of 1.26 x 108. The excellent SERS detection sensitivity and spatial uniformity of the platform were validated with SERS measurements on deoxyribonucleic acid strand.

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