Plasmon Heating Promotes Ligand Reorganization on Single Gold Nanorods
| Autor: | Aaron J. McLeod, Zhongwei Hu, Vignesh Sundaresan, Xiaoyu Cheng, Taryn P. Anthony, Claire A. West, Katherine A. Willets, David J. Masiello |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Shell (structure) 02 engineering and technology Photothermal therapy 010402 general chemistry 021001 nanoscience & nanotechnology Ligand (biochemistry) 01 natural sciences Fluorescence 0104 chemical sciences Metal visual_art Fluorescence microscope Biophysics visual_art.visual_art_medium General Materials Science Nanorod Physical and Theoretical Chemistry 0210 nano-technology Plasmon |
| Zdroj: | The journal of physical chemistry letters. 10(6) |
| ISSN: | 1948-7185 |
| Popis: | Single-molecule fluorescence microscopy is used to follow dynamic ligand reorganization on the surface of single plasmonic gold nanorods. Fluorescently labeled DNA is attached to gold nanorods via a gold-thiol bond using a low-pH loading method. No fluorescence activity is initially observed from the fluorescent labels on the nanorod surface, which we attribute to a collapsed geometry of DNA on the metal. Upon several minutes of laser illumination, a marked increase in fluorescence activity is observed, suggesting that the ligand shell reorganizes from a collapsed, quenched geometry to an upright, ordered geometry. The ligand reorganization is facilitated by plasmon-mediated photothermal heating, as verified by controls using an external heat source and simulated by coupled optical and heat diffusion modeling. Using super-resolution image reconstruction, we observe spatial variations in which ligand reorganization occurs at the single-particle level. The results suggest the possibility of nonuniform plasmonic heating, which would be hidden with traditional ensemble-averaged measurements. |
| Databáze: | OpenAIRE |
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