7–10 Sept 2020
Europe/Zurich timezone
20. konference českých a slovenských fyziků

ENHANCING GOLD BY GOLD: PLASMON ENHANCED LUMINESCENCE OF GOLD NANOCLUSTERS ON GOLD NANORODS

10 Sept 2020, 08:30
20m
lecture hall T2 (building A)

lecture hall T2

building A

Speaker

Pavelka O. (Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Prague)

Description

One of the fundamental features of nanotechnology is that properties of a certain material can
be changed just by varying its shape and size. This exactly is the case for the two types of
gold nanostructures in our study, where luminescent gold nanoclusters (AuNCs) benefit from
the presence of plasmonic gold nanorods (AuNRs). Despite the limited number of atoms,
AuNRs with characteristic dimensions ranging from ~10 to 100 nm still retain their metallic
properties. Consequently, collective oscillations of the nearly free conductive electrons (so
called localized surface plasmon resonance; LSPR) can be excited in AuNRs upon interaction
with an incoming electromagnetic radiation. In recent years, LSPR has been widely used to
enhance the optical performance of other nearby objects (e.g. surface-enhanced Raman
scattering or luminescence).
The electronic structure of AuNCs with diameter of ~1 nm is, on the other hand, rather
molecular-like, which can result in near-infrared photoluminescence from the nanoclusters.
In the present study, we attempt to increase the radiative rate in AuNCs by coupling their
emission to plasmons of AuNRs in a core@shell AuNRs@AuNCs structure. By measuring
the changes in luminescence of AuNCs upon attachment to AuNRs we demonstrate that it is
indeed possible to enhance gold by gold.

Primary author

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