Silver Eco-Solvent Ink for Reactive Printing of Polychromatic SERS and SPR Substrates

A new reactive ink based on a silver citrate complex is proposed for a photochemical route to surface-enhanced Raman spectroscopy active substrates with controllable extinction spectra. The drop-cast test of the ink reveals homogeneous nucleation of silver and colloid particle growth originating dir...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2018-02, Vol.18 (2), p.521
Main Authors: Dustov, Mavlavi, Golovina, Diana I, Polyakov, Alexander Yu, Goldt, Anastasia E, Eliseev, Andrei A, Kolesnikov, Efim A, Sukhorukova, Irina V, Shtansky, Dmitry V, Grünert, Wolfgang, Grigorieva, Anastasia V
Format: Article
Language:English
Subjects:
Extinction
Methylene blue
photoreaction
plasmon resonance
Raman spectroscopy
reactive ink
Rhodamine 6G
Ring structures
silver nanostructures
Spectrum analysis
Structural hierarchy
surface-enhanced Raman scattering
Ultraviolet radiation
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Summary:A new reactive ink based on a silver citrate complex is proposed for a photochemical route to surface-enhanced Raman spectroscopy active substrates with controllable extinction spectra. The drop-cast test of the ink reveals homogeneous nucleation of silver and colloid particle growth originating directly from photochemical in situ reduction in droplets, while the following evaporation of the deposited ink produces small nano- and micron-size particles. The prepared nanostructures and substrates were accurately characterized by electron microscopy methods and optical extinction spectroscopy. Varying the duration of UV irradiation allows tuning the morphology of individual silver nanoparticles forming hierarchical ring structures with numerous "hot spots" for most efficient Raman enhancement. Raman measurements of probe molecules of rhodamine 6G and methylene blue reached the largest signal enhancement of 10⁶ by the resonance effects.
ISSN:1424-8220
1424-8220
DOI:10.3390/s18020521