Dewetted Au Nanoparticles on TiO2 Surfaces: Evidence of a Size-Independent Plasmonic Photoelectrochemical Response

Journal article


Publication Details

Author(s): Licklederer M, Mohammadi R, Nguyen NT, Park H, Hejazi S, Halik M, Vogel N, Altomare M, Schmuki P
Journal: Journal of Physical Chemistry C
Publication year: 2019
Volume: 123
Journal issue: 27
Pages range: 16934-16942
ISSN: 1932-7447
eISSN: 1932-7455


Abstract

We induce solid-state dewetting of thin Au films (nominal thickness of 0.5-10 nm) on flat TiO2 surfaces to produce Au nanoparticles with an average size tunable in the 3-200 nm range. Such Au-decorated TiO2 surfaces enable plasmonic photoelectrochemical water splitting under visible light illumination (450-750 nm), with a photon-to-current conversion efficiency that reaches a maximum for TiO2 surfaces decorated with similar to 30 nm sized Au particles. Optical measurements show, as expected, a red shift of the plasmon resonance with the increasing Au nanoparticle size. More interestingly, the photocurrent is found to peak for every photoanode at similar to 600 nm regardless of the Au nanoparticle size, i.e., the wavelength of maximum photocurrent is size-independent. Such a remarkable observation can be ascribed to a hot electron injection cutoff effect, i.e., can be explained in terms of the interband versus intraband transition scenario.


FAU Authors / FAU Editors

Altomare, Marco
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Halik, Marcus Prof. Dr.
Professur für Werkstoffwissenschaften (Polymerwerkstoffe)
Hejazi, Seyedsina
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Licklederer, Markus
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Nguyen, Nhat Truong
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Park, Hyoungwon
Professur für Werkstoffwissenschaften (Polymerwerkstoffe)
Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Vogel, Nicolas Prof. Dr.
Professur für Partikelsynthese


How to cite

APA:
Licklederer, M., Mohammadi, R., Nguyen, N.T., Park, H., Hejazi, S., Halik, M.,... Schmuki, P. (2019). Dewetted Au Nanoparticles on TiO2 Surfaces: Evidence of a Size-Independent Plasmonic Photoelectrochemical Response. Journal of Physical Chemistry C, 123(27), 16934-16942. https://dx.doi.org/10.1021/acs.jpcc.9b02769

MLA:
Licklederer, Markus, et al. "Dewetted Au Nanoparticles on TiO2 Surfaces: Evidence of a Size-Independent Plasmonic Photoelectrochemical Response." Journal of Physical Chemistry C 123.27 (2019): 16934-16942.

BibTeX: 

Last updated on 2019-06-08 at 09:06