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

Physical Chemistry Chemical Physics : PCCP
C De RosaAntonio Sasso

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 (> 10(4) μm(2)) 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 cm(2)). 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.

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Citations

Nov 17, 2015·Scientific Reports·Jianxiang TianSalvatore Torquato
Jul 15, 2016·Optics Express·Gianluigi ZitoAntonio Sasso
Aug 23, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Salvatore Torquato
Aug 18, 2018·Optics Express·Diego Di BattistaMarco Leonetti
Mar 20, 2018·Physical Review. E·Robert A DiStasioSalvatore Torquato
Aug 28, 2020·Physical Review Letters·Zheng MaSalvatore Torquato
Dec 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Gianluigi ZitoAntonio Sasso
Oct 6, 2020·Physical Review Letters·Marco SalvalaglioMarco Abbarchi
Sep 19, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G ZhangS Torquato
Sep 15, 2016·Physical Review. E·Salvatore Torquato

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