Spatial Extent of Fluorescence Quenching in Mixed Semiconductor-Metal Nanoparticle Gel Networks

verfasst von

Marina Rosebrock, Dániel Zámbó, Pascal Rusch, Denis Pluta, Frank Steinbach, Patrick Bessel, Anja Schlosser, Armin Feldhoff, Karen D.J. Hindricks, Peter Behrens, Dirk Dorfs, Nadja C. Bigall

Abstract

In this work, mixing and co-gelation of Au nanoparticles (NPs) and highly luminescent CdSe/CdS core/shell nanorods (NRs) are used as tools to obtain noble metal particle-decorated macroscopic semiconductor gel networks. The hybrid nature of the macrostructures facilitates the control over the optical properties: while the holes are trapped in the CdSe cores, the connected CdSe/CdS NRs support the mobility of excited electrons throughout the porous, hyperbranched gel networks. Due to the presence of Au NPs in the mixed gels, electron trapping in the gold NPs leads to a suppressed radiative recombination, namely, quenches the fluorescence in certain fragments of the multicomponent gel. The extent of fluorescence quenching can be influenced by the quantity of the noble metal domains. The optical properties are monitored as a function of the NR:NP ratio of a model system CdSe/CdS:Au. By this correlation, it demonstrates that the spatial extent of quenching initiated by a single Au NP exceeds the dimensions of one NR, which the Au is connected to (with a length of 45.8 nm ± 4.1 nm) and can reach the number of nine NRs per Au NP, which roughly corresponds to 400 nm of total electron travel distance within the network structure.

Organisationseinheit(en)

Institut für Physikalische Chemie und Elektrochemie
Laboratorium für Nano- und Quantenengineering
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Institut für Anorganische Chemie

Externe Organisation(en)

Exzellenzcluster Hearing4all

Typ

Artikel

Journal

Advanced functional materials

Band

31

ISSN

1616-301X

Publikationsdatum

07.10.2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Chemie, Allgemeine Materialwissenschaften, Physik der kondensierten Materie

Elektronische Version(en)

https://doi.org/10.1002/adfm.202101628 (Zugang: Offen)