N-Heterocyclic carbene-stabilized gold nanoparticles and luminescent quantum dots

Neda Arabzadeh Nosratabad; Zhicheng Jin; Liang Du; Hedi Mattoussi

doi:10.1117/12.2610485

3 March 2022 N-Heterocyclic carbene-stabilized gold nanoparticles and luminescent quantum dots

Neda Arabzadeh Nosratabad, Zhicheng Jin, Liang Du, Hedi Mattoussi

Proceedings Volume 11977, Colloidal Nanoparticles for Biomedical Applications XVII; 1197703 (2022) https://doi.org/10.1117/12.2610485
Event: SPIE BiOS, 2022, San Francisco, California, United States

Abstract

N-heterocyclic carbenes (NHCs) have attracted tremendous attention over the past decade, as it is expected to form strong coordination to transition metal complexes and surfaces. Here, we investigate the interactions between colloidal gold nanoparticles (AuNPs), or luminescent quantum dots (QDs) and a multidentate NHC-based polymer ligand. The ligand design relies on the nucleophilic addition reaction between several NHC anchoring groups, short polyethylene glycol (PEG) blocks, and a polymer chain. We find that such NHC-decorated ligands rapidly coordinate onto both sets of nanocrystals, which is attributed to the inherent σ-donating nature (soft Lewis base) of NHC groups combined with the soft Lewis acidic character of nanocrystal surfaces. We combine NMR spectroscopy, fluorescence spectroscopy, high-resolution transmission electron microscopy and dynamic light scattering to characterize the NHCstabilized nanocrystals and gain insights into the nature of the binding interactions. In particular, we find that the newly coated nanocrystals exhibit long-term colloidal stability over a broad range of conditions with no sign of degradation or aggregation build up, while preserving their photophysical properties, for at least one year of storage.

Citation Download Citation

Neda Arabzadeh Nosratabad, Zhicheng Jin, Liang Du, and Hedi Mattoussi "N-Heterocyclic carbene-stabilized gold nanoparticles and luminescent quantum dots", Proc. SPIE 11977, Colloidal Nanoparticles for Biomedical Applications XVII, 1197703 (3 March 2022); https://doi.org/10.1117/12.2610485

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