Silica nanoparticles containing a rhodamine dye and multiple gold nanorods
| Autor: | Charles W. Blackledge, Thibault Tabarin, Robert J. Forster, Tia E. Keyes, Emilie Masson |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Quenching (fluorescence) Scanning electron microscope Analytical chemistry Bioengineering General Chemistry Condensed Matter Physics Photochemistry Atomic and Molecular Physics and Optics Rhodamine symbols.namesake chemistry.chemical_compound chemistry Modeling and Simulation Microscopy symbols General Materials Science Nanorod Surface plasmon resonance Raman spectroscopy Plasmon |
| Zdroj: | Journal of Nanoparticle Research. 13:4659-4672 |
| ISSN: | 1572-896X 1388-0764 |
| DOI: | 10.1007/s11051-011-0429-5 |
| Popis: | Silica shells are grown around colloidally synthesized gold nanorods (AuNRs) to form core–shell particles (AuNR@SiO2) of variable occupancy, defined as the number of AuNRs per silica particle. Multiple AuNR occupancy within the silica shell, confirmed with high-resolution electron microscopy, is reflected in a redshift of the longitudinal plasmon mode of the nanorods due to multipolar coupling between AuNRs of a favored end–end orientation. In addition to the plasmon resonance that dominates their absorbance spectra, FL-AuNR@SiO2, core–shell particles incorporating a lipid probe (rhodamine-DOPE), can be monitored by their fluorescence and Raman signals. Optical and scanning electron microscopy (SEM) images are compared directly, enabling the correlation of spectroscopic characteristics with particle morphology. Raman and SEM images show that the most intense Raman signals come from aggregates of AuNRs trapped within the silica matrix. Biexponential fits to fluorescence decays indicate that competing mechanisms of quenching and fluorescence enhancement contribute to a reduced fluorescence lifetime of rhodamine-DOPE located near the AuNRs. |
| Databáze: | OpenAIRE |
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