Engineering the Absorption and Field Enhancement Properties of Au-TiO2 Nanohybrids via Whispering Gallery Mode Resonances for Photocatalytic Water Splitting

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jianming Zhang
  • Xin Jin
  • Pablo I. Morales-Guzman
  • Xin Yu
  • Hong Liu
  • Luca Razzari
  • Jerome P. Claverie

Detail(s)

Original languageEnglish
Pages (from-to)4496-4503
Journal / PublicationACS Nano
Volume10
Issue number4
Online published7 Apr 2016
Publication statusPublished - 26 Apr 2016
Externally publishedYes

Abstract

Recently, surface plasmon resonance (SPR) effects have been widely used to construct photocatalysts which are active in the visible spectral region. Such plasmonic photocatalysts usually comprise a semiconductor material transparent in the visible range (such as TiO2) and plasmonic nano-objects (e.g., Au nanoparticles (Au NPs)). Specific SPRs, though, only partially cover the visible spectrum and feature weak light absorption. Here, we explore the unique role played by whispering gallery mode (WGM) resonances in the expression of the photocatalytic activity of plasmonic photocatalysts. Using numerical simulations, we demonstrate that, by solely exploiting a proper geometrical arrangement and WGM resonances in a TiO2 sphere, the plasmonic absorption can be extended over the entire visible range and can be increased by more than 40 times. Furthermore, the local electric field at the Au-TiO2 interface is also considerably enhanced. These results are experimentally corroborated, by means of absorption spectroscopy and Raman measurements. Accordingly, such WGM-assisted plasmonic photocatalysts, when employed in water splitting experiments, exhibit enhanced activity in the visible range. Our findings show a promising and straightforward way to design full solar spectrum photocatalysts.

Research Area(s)

  • Au nanoparticle, photocatalysis, plasmonics, TiO2, whispering gallery mode resonances

Citation Format(s)

Engineering the Absorption and Field Enhancement Properties of Au-TiO2 Nanohybrids via Whispering Gallery Mode Resonances for Photocatalytic Water Splitting. / Zhang, Jianming; Jin, Xin; Morales-Guzman, Pablo I. et al.

In: ACS Nano, Vol. 10, No. 4, 26.04.2016, p. 4496-4503.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review