Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



Electrochemical modulation of plasmon-induced charge separation behaviour at Au–TiO2 photocathodes

Author affiliations

Abstract

Plasmon-induced charge separation (PICS) at the interface between a plasmonic nanoparticle and a semiconductor becomes less efficient as the plasmon resonance wavelength increases, because the energy of a photon may not be sufficiently higher than the interfacial Schottky barrier height. In this study, we developed PICS photocathodes by coating Au nanoparticles of different sizes on an ITO electrode with a thin TiO2 layer, and applied negative potentials to those photocathodes so as to suppress back electron transfer and improve the PICS photocurrent responses. The photocurrent enhancement factor was increased as the particle size was decreased, and enhancement of about two orders of magnitude was observed for small Au nanoparticles when bias voltage of 0.5 V was applied. In some cases the photocurrent enhancement was accompanied by a slight redshift of the photocurrent peak, which was caused by a lowered barrier. This technique would be useful for tuning the photocurrents when it is applied to devices such as electrochemical LSPR sensors and photodetectors.

Graphical abstract: Electrochemical modulation of plasmon-induced charge separation behaviour at Au–TiO2 photocathodes

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Feb 2019, accepted on 30 Apr 2019 and first published on 01 May 2019


Article type: Paper
DOI: 10.1039/C9PP00098D
Photochem. Photobiol. Sci., 2019, Advance Article

  •   Request permissions

    Electrochemical modulation of plasmon-induced charge separation behaviour at Au–TiO2 photocathodes

    K. Akiyoshi and T. Tatsuma, Photochem. Photobiol. Sci., 2019, Advance Article , DOI: 10.1039/C9PP00098D

Search articles by author

Spotlight

Advertisements