Golden Plasmophores with Tunable Photoluminescence and Outstanding Thermal and Photothermal Stability

Mustafa Gharib, A. J. Yates, Stephen Sanders, Johannes Gebauer, Sebastian Graf, Anna Rosa Ziefuß, Nonappa, Günther Kassier, Christoph Rehbock, Stephan Barcikowski, Horst Weller, Alessandro Alabastri, Peter Nordlander, Wolfgang J. Parak, Indranath Chakraborty

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Among various hybrid nanomaterials, the combination of plasmonic nanoparticles and fluorophores in a single multifunctional nanoplatform, so-called plasmophores, has attracted significant attention in different fields such as dark field, fluorescence, and photoacoustic imaging, biosensing, photothermal, and photodynamic therapy. Herein, author report a facile and controlled synthesis route of hybrid nanoplatforms composed of fluorescent gold nanoclusters (GNCs) coupled to plasmonic gold nanorods (GNRs) using controlled silica (SiO2) dielectric spacers of different thicknesses from now on referred to as GNR@SiO2@GNC plasmophores. The results show different degrees of plasmon-enhanced fluorescence of the GNCs in their plasmophore hybrid system when placed at different distances from the plasmonic cores of the GNRs. On the other hand, these plasmophores show enhanced thermal stability compared to GNRs@CTAB (CTAB, cetyl trimethyl ammonium bromide). This results also demonstrated that upon annealing at elevated temperatures (800–1000 °C), the GNRs in the plasmophores are more thermally stable and robust than the GNRs@CTAB. More surprisingly, despite the commonly reported very low melting temperature of smaller-size nanocrystals, the GNCs in the plasmophores showed high thermal stability and do not exhibit significant structural changes at elevated temperatures (800–1000 °C).

Original languageEnglish
JournalAdvanced Optical Materials
DOIs
Publication statusE-pub ahead of print - 2024
Publication typeA1 Journal article-refereed

Keywords

  • fluorescence
  • gold nanoclusters
  • gold nanorods
  • plasmophores
  • thermal stability

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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