Metal - elastomer nanostructures for tunable SERS and easy microfluidic integration

Andrea, Lamberti; Alessandro, Virga; Angelini, Angelo; Alessandro, Ricci; Descrovi, Emiliano; Matteo, Cocuzza; Fabrizio, Giorgis

doi:10.1039/c4ra12168f

Stretchable plasmonic nanostructures constituted by Ag nanoparticles on flexible elastomeric matrices are synthesized and used as surface-enhanced Raman scattering (SERS) substrates. The structure consists of silver particles deposited by DC sputtering on polydimethylsiloxane (PDMS). The optical transmittance spectra show marked dips related to plasmonic inter-particle short-range interactions. The substrates show noticeable Raman enhancement allowing detection of R6G at very low concentration. Under mechanically controlled stretching, the interparticle gap sizes change yielding a reversible spectral shift of the plasmonic resonance. Experimental results are validated by 3D modeling. When such a resonance matches the Raman excitation line, pronounced enhancements can be achieved, optimizing the SERS regime. Taking advantage of the PDMS matrices, these tunable SERS-active substrates are integrated in microfluidic circuitry fruitfully exploitable for on-chip label-free detection.

Metal - elastomer nanostructures for tunable SERS and easy microfluidic integration / Lamberti, Andrea; Virga, Alessandro; Angelini, Angelo; Ricci, Alessandro; Descrovi, Emiliano; Cocuzza, Matteo; Giorgis, Fabrizio. - In: RSC ADVANCES. - ISSN 2046-2069. - 5:6(2015), pp. 4404-4410. [10.1039/c4ra12168f]

Titolo:	Metal - elastomer nanostructures for tunable SERS and easy microfluidic integration
Autori:	Andrea Lamberti Alessandro Virga ANGELINI, ANGELO Alessandro Ricci DESCROVI, EMILIANO Matteo Cocuzza Fabrizio Giorgis mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2015
Rivista:	RSC ADVANCES
Digital Object Identifier (DOI):	http://dx.doi.org/10.1039/c4ra12168f
Abstract:	Stretchable plasmonic nanostructures constituted by Ag nanoparticles on flexible elastomeric matr...ices are synthesized and used as surface-enhanced Raman scattering (SERS) substrates. The structure consists of silver particles deposited by DC sputtering on polydimethylsiloxane (PDMS). The optical transmittance spectra show marked dips related to plasmonic inter-particle short-range interactions. The substrates show noticeable Raman enhancement allowing detection of R6G at very low concentration. Under mechanically controlled stretching, the interparticle gap sizes change yielding a reversible spectral shift of the plasmonic resonance. Experimental results are validated by 3D modeling. When such a resonance matches the Raman excitation line, pronounced enhancements can be achieved, optimizing the SERS regime. Taking advantage of the PDMS matrices, these tunable SERS-active substrates are integrated in microfluidic circuitry fruitfully exploitable for on-chip label-free detection.
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