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Bimetallic Core–Shell Nanoparticles of Gold and Silver via Bioinspired Polydopamine Layer as Surface-Enhanced Raman Spectroscopy (SERS) Platform

by Asli Yilmaz 1,2 and Mehmet Yilmaz 2,3,4,*
1
Department of Molecular Biology and Genetics, Ataturk University, Erzurum 25240, Turkey
2
East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, Erzurum 25240, Turkey
3
Department of Chemical Engineering, Ataturk University, Erzurum 25240, Turkey
4
Department of Nanoscience and Nanoengineering, Ataturk University, Erzurum 25240, Turkey
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 688; https://doi.org/10.3390/nano10040688
Received: 24 February 2020 / Revised: 26 March 2020 / Accepted: 2 April 2020 / Published: 5 April 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Despite numerous attempts to fabricate the core–shell nanoparticles, novel, simple, and low-cost approaches are still required to produce these efficient nanosystems. In this study, we propose the synthesis of bimetallic core–shell nanoparticles of gold (AuNP) and silver (AgNP) nanostructures via a bioinspired polydopamine (PDOP) layer and their employment as a surface-enhanced Raman spectroscopy (SERS) platform. Herein, the PDOP layer was used as an interface between nanostructures as well as stabilizing and reducing agents for the deposition of silver ions onto the AuNPs. UV-vis absorption spectra and electron microscope images confirmed the deposition of the silver ions and the formation of core–shell nanoparticles. SERS activity tests indicated that both the PDOP thickness and silver deposition time are the dominant parameters that determine the SERS performances of the proposed core–shell system. In comparison to bare AuNPs, more than three times higher SERS signal intensity was obtained with an enhancement factor of 3.5 × 105. View Full-Text
Keywords: bimetallic core–shell nanoparticles; gold nanoparticles; polydopamine; surface-enhanced Raman spectroscopy (SERS) bimetallic core–shell nanoparticles; gold nanoparticles; polydopamine; surface-enhanced Raman spectroscopy (SERS)
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Yilmaz, A.; Yilmaz, M. Bimetallic Core–Shell Nanoparticles of Gold and Silver via Bioinspired Polydopamine Layer as Surface-Enhanced Raman Spectroscopy (SERS) Platform. Nanomaterials 2020, 10, 688.

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