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Issue 12, 2015
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Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy

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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.

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

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Publication details

The article was received on 23 Dec 2014, accepted on 23 Feb 2015 and first published on 23 Feb 2015


Article type: Paper
DOI: 10.1039/C4CP06024E
Citation: Phys. Chem. Chem. Phys., 2015,17, 8061-8069
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    Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy

    C. De Rosa, F. Auriemma, C. Diletto, R. Di Girolamo, A. Malafronte, P. Morvillo, G. Zito, G. Rusciano, G. Pesce and A. Sasso, Phys. Chem. Chem. Phys., 2015, 17, 8061
    DOI: 10.1039/C4CP06024E

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