Improvement of surface-enhanced Raman scattering by dipolar resonance mode of silver half-shell array

Du, Wei; Yan, Zhendong; Gu, Ping; Tu, Linlin; You, En‐Ming; Zhan, Peng; Wang, Zhenlin

doi:10.1007/s00339-015-9165-5

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…In the wavelength range 600−800 nm, the electric fields are localized sharply at the junctions between two adjacent halfshells, as indicated with the arrows in Figure c‐f. Similar behaviors were reported for 2D structures of Ag semishells on polystyrene spheres,, Au semishells on hollow TiO 2 spheres, and Cu halfshells on SiO 2 spheres . It has been reported that an isolated metal halfshell shows two different plasmon modes: a transverse electron oscillation parallel to the rotational symmetry axis of the halfshell (α mode), and a longitudinal electron oscillation perpendicular to the axis (β mode) .…”

Section: Resultssupporting

confidence: 77%

Two‐Dimensional Arrays of Au Halfshells with Different Sizes for Plasmon‐Induced Charge Separation

Tsunenari

Nishi

et al. 2017

ChemistrySelect

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Plasmon‐induced charge separation (PICS) at plasmonic metal‐semiconductor interfaces has been used for photovoltaics, photocatalysis, and many other photofunctional materials and devices. In most of those cases, dispersed and disordered metal nanoparticle ensembles have been used. We prepared two‐dimensionally ordered and interconnected Au halfshell arrays on SiO2@TiO2 core‐shell nanosphere colloidal crystals and exploited them for PICS. The present system exhibits broad light absorption over the visible to near‐infrared (NIR) range, leading to wide photoelectrochemical responses. Here we report that this system is characterized not only by localized and propagating surface plasmons but also by light propagation through the colloidal crystals, which enhances plasmonic light harvesting. Effects of the SiO2 core size were examined, and the middle‐sized cores were found to be optimum for efficient PICS processes because of strong electric field at the photoelectrode.

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Section: Resultssupporting

confidence: 77%