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.

Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy / DE ROSA, Claudio; Auriemma, Finizia; Diletto, C.; DI GIROLAMO, Rocco; Malafronte, Anna; Morvillo, P.; Zito, Gianluigi; Rusciano, Giulia; Pesce, Giuseppe; Sasso, Antonio. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 17:12(2015), pp. 8061-8069. [10.1039/c4cp06024e]

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

DE ROSA, CLAUDIO;AURIEMMA, FINIZIA;DI GIROLAMO, ROCCO;MALAFRONTE, ANNA;ZITO, GIANLUIGI;RUSCIANO, GIULIA;PESCE, GIUSEPPE;SASSO, ANTONIO
2015

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
Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy / DE ROSA, Claudio; Auriemma, Finizia; Diletto, C.; DI GIROLAMO, Rocco; Malafronte, Anna; Morvillo, P.; Zito, Gianluigi; Rusciano, Giulia; Pesce, Giuseppe; Sasso, Antonio. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 17:12(2015), pp. 8061-8069. [10.1039/c4cp06024e]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/613169
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