Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy

TitleToward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2015
AuthorsDe Rosa, C., Auriemma F., Diletto C., Di Girolamo R., Malafronte A., Morvillo P., Zito G., Rusciano G., Pesce G., and Sasso A.
JournalPhysical Chemistry Chemical Physics
Volume17
Pagination8061-8069
ISSN14639076
Abstract

We report on the self-assembling of clusters of gold-nanoparticles (Au-NPs) directed by the phase separation of poly(styrene)-b-poly(methylmethacrylate) (PS-b-PMMA) block-copolymer (BCP) on indium tin oxide coated glass, which induces the onset of vertical lamellar domains. After thermal evaporation of gold on BCP, Au-NPs of 4 nm are selectively included into PS-nanodomains by thermal annealing, and then clustered with large density of hot spots (> 104 μm2) in a random two-dimensional pattern. The resulting nanostructure exhibits near-hyperuniform long-range correlations. The consequent large degree of homogeneity of this isotropic plasmonic pattern gives rise to a highly reproducible Surface-Enhanced Raman Scattering (SERS) enhancement factor over the centimeter scale (std. dev. ∼ 10% over 0.25 cm2). We also discuss the application of a static electric field for modulating the BCP host morphology. The electric field induces an alignment of Au-NP clusters into ordered linear chains, exhibiting a stronger SERS activity, but reduced SERS spatial reproducibility. © 2015 the Owner Societies.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84924913126&doi=10.1039%2fc4cp06024e&partnerID=40&md5=b69fa534b68160210ed67dbead9f9c0a
DOI10.1039/c4cp06024e