Optical activity of catalytic elements of hetero-metallic nanostructures
Paper i proceeding, 2015

Interaction of light with metals in the form of surface plasmons is used in a wide range of applications in which the scattering decay channel is important. The absorption channel is usually thought of as unwanted and detrimental to the efficiency of the device. This is true in many applications, however, recent studies have shown that maximization of the decay channel of surface plasmons has potentially significant uses. One of these is the creation of electron-hole pairs or hot electrons which can be used for e.g. catalysis. Here, we study the optical properties of hetero-metallic nanostructures that enhance light interaction with the catalytic elements of the nanostructures. A hybridized LSPR that matches the spectral characteristic of the light source is excited. This LSPR through coupling between the plasmonic elements maximizes light absorption in the catalytic part of the nanostructure. Numerically calculated visible light absorption in the catalytic nanoparticles is enhanced 12-fold for large catalytic disks and by more 30 for small nanoparticles on the order of 5 nm. In experiments we measure a sizable increase in the absorption cross section when small palladium nanoparticles are coupled to a large silver resonator. These observations suggest that heterometallic nanostructures can enhance catalytic reaction rates.

solar harvesting

transition metals

plasmon-assisted photocatalysis

plasmonics

catalysis

Författare

Tomasz Antosiewicz

Chalmers, Teknisk fysik, Bionanofotonik

Peter Apell

Chalmers, Teknisk fysik

Carl Wadell

Chalmers, Teknisk fysik, Kemisk fysik

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Proceedings of SPIE - The International Society for Optical Engineering

0277786X (ISSN) 1996756X (eISSN)

Vol. 9502 95020D

Ämneskategorier

Nanoteknik

DOI

10.1117/12.2180045

ISBN

978-1-62841-623-7

Mer information

Skapat

2017-10-08