Near-infrared/visible-emitting nanosilica modified with silylated Ru(II) and Ln(III) complexes
Abstract
Three luminescent silica-based nanohybrids were fabricated by grafting of silylated Ru(II) and Nd/Yb(III) complexes onto mesoporous silica nanoparticles obtained by microemulsion method. The prepared nanohybrids were characterized by Fourier transform-Raman spectroscopy, solid state-nuclear magnetic resonance, high resolution-transmission electron microscopy and scanning and transmission electron microscopy techniques. The chemical integrity and the grafting of all complexes inside MSNs nanopores as well as a good distribution of metal complexes onto MSNs surface were achieved for all nanohybrids. Photophysical results revealed that by monitoring the excitation on Ru(II) moieties from SiO2-RuNd and SiO2-RuYb nanohybrids, the sensitization of NIR-emitting Nd/Yb(III) ions were successfully detected via energy transfer processes. Energy transfer rates (kEnT) of 0.20 × 107 and 0.11 × 107 s-1 and efficiencies of energy transfer (ηEnT) of 40% and 27.5% were obtained for SiO2-RuNd and SiO2-RuYb nanohybrids, respectively. These results confirm the preparation of promising dual (near-infrared/visible)-emitting silica-based nanohybrids as new nanotools for applications as nanosensores and nanomarkers.
- Publication:
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Nanotechnology
- Pub Date:
- January 2020
- DOI:
- 10.1088/1361-6528/ab494f
- Bibcode:
- 2020Nanot..31c5602S
- Keywords:
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- silylated Ru(II) and Ln(III) complexes;
- mesoporous silica nanoparticles;
- dual-emitting silica-based nanohybrids