Collective excitation of plasmonic hot-spots for enhanced hot charge carrier transfer in metal/semiconductor contacts

Adrien Piot; Stuart K Earl; Charlene Ng; Svetlana Dligatch; Ann Roberts; Timothy J Davis; Daniel E Gomez

Journal article

Collective excitation of plasmonic hot-spots for enhanced hot charge carrier transfer in metal/semiconductor contacts

Adrien Piot, Stuart K Earl, Charlene Ng, Svetlana Dligatch, Ann Roberts, Timothy J Davis, Daniel E Gomez

NANOSCALE | ROYAL SOC CHEMISTRY | Published : 2015

DOI: 10.1039/c5nr01592h

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Abstract

We show how a combination of near- and far-field coupling of the localised surface plasmon resonances in aluminium nanoparticles deposited on TiO2 films greatly enhances the visible light photocatalytic activity of the semiconductor material. We demonstrate two orders of magnitude enhancement in the rate of decomposition of methylene blue under visible light illumination when the surface of TiO2 films is decorated with gratings of Al nanoparticle dimers.

University of Melbourne Researchers

Daniel Gomez Author Physics

Timothy J. Davis Author Physics

Ann Roberts Author Physics

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Funding Acknowledgements

This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). A. P. was jointly supported by the MCN and CSIRO. C. N. was supported by an OCE Fellowship from CSIRO. D. E. G. acknowledges the ARC for support through a Future Fellowship (FT140100514) and F. Eftekhari for fruitful advise on EBL and L. Hyde for his help on ellipsometric measurements. D. E. G. and T. J. D. acknowledge the ANFF for the MCN Technology Fellowships.