Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission
| Autor: | Abdulrahman F. Ezzir, Zhenyu Zhang, Louis H. Haber, Tony E. Karam, Noureen Siraj, Isiah M. Warner |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Analytical chemistry General Physics and Astronomy Second-harmonic generation Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences chemistry.chemical_compound Brilliant green Colloidal gold Excited state Ultrafast laser spectroscopy Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | The Journal of Chemical Physics. 147:144701 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.4994712 |
| Popis: | The synthesis, characterization, ultrafast dynamics, and nonlinear spectroscopy of 30 nm nanospheres of brilliant green-bis(pentafluoroethylsulfonyl)imide ([BG][BETI]) in water are reported. These thermally stable nanoparticles are derived from a group of uniform materials based on organic salts (nanoGUMBOS) that exhibit enhanced near-infrared emission compared with the molecular dye in water. The examination of ultrafast transient absorption spectroscopy results reveals that the overall excited-state relaxation lifetimes of [BG][BETI] nanoGUMBOS are longer than the brilliant green molecular dye in water due to steric hindrance of the torsional degrees of freedom of the phenyl rings around the central carbon. Furthermore, the second harmonic generation signal of [BG][BETI] nanoGUMBOS is enhanced by approximately 7 times and 23 times as compared with colloidal gold nanoparticles of the same size and the brilliant green molecular dye in water, respectively. A very clear third harmonic generation signal is observed from the [BG][BETI] nanoGUMBOS but not from either the molecular dye or the gold nanoparticles. Overall, these results show that [BG][BETI] nanoGUMBOS exhibit altered ultrafast and nonlinear spectroscopy that is beneficial for various applications including nonlinear imaging probes, biomedical imaging, and molecular sensing. |
| Databáze: | OpenAIRE |
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