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Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles
Delft University of Technology, Netherlands.
Delft University of Technology, Netherlands.
Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-3002-3639
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2017 (English)In: ACS PHOTONICS, ISSN 2330-4022, Vol. 4, no 5, 1146-1152 p.Article in journal (Refereed) Published
Abstract [en]

The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices in order to extend the visible light utilization of semiconductors to light energies below their band gap. These nanoparticles absorb light and produce hot electrons and holes that can drive artificial photosynthesis reactions. For n-type semiconductor photoanodes decorated with PNPs, hot charge carriers are separated by a process called hot electron injection (HEI), where hot electrons with sufficient energy are transferred to the conduction band of the semiconductor. An important parameter that affects the HEI efficiency is the nanoparticle composition, since the hot electron energy is sensitive to the electronic band structure of the metal. Alloy PNPs are of particular importance for semiconductor/PNPs composites, because by changing the alloy composition their absorption spectra can be tuned to accurately extend the light absorption of the semiconductor. This work experimentally compares the HEI efficiency from Ag, Au, and Ag/Au alloy nanoparticles to TiO2 photoanodes for the photoproduction of hydrogen. Alloy PNPs not only exhibit tunable absorption but can also improve the stability and electronic and catalytic properties of the pure metal PNPs. In this work, we find that the Ag/Au alloy PNPs extend the stability of Ag in water to larger applied potentials while, at the same time, increasing the interband threshold energy of Au. This increasing of the interband energy of Au suppresses the visible-light induced interband excitations, favoring intraband excitations that result in higher hot electron energies and HEI efficiencies.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 4, no 5, 1146-1152 p.
Keyword [en]
hot electron injection; alloy nanoparticles; plasmonic nanoparticles; artificial photosynthesis; hydrogen photoproduction; gold nanoparticles; silver nanoparticles
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-138260DOI: 10.1021/acsphotonics.6b01048ISI: 000401781600018OAI: oai:DiVA.org:liu-138260DiVA: diva2:1109123
Note

Funding Agencies|NWO VIDI grant

Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13

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