Fluorescent Ag nanoclusters prepared in aqueous poly(acrylic acid-co-maleic acid) solutions: a spectroscopic study of their excited state dynamics, size and local environment
| Autor: | Debabrata Mandal, Manika Dandapat |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Aqueous solution Maleic acid Analytical chemistry General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Nanoclusters chemistry.chemical_compound chemistry Absorption band Excited state Physical and Theoretical Chemistry Absorption (chemistry) 0210 nano-technology Acrylic acid |
| Zdroj: | Physical Chemistry Chemical Physics. 18:2564-2573 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c5cp05282c |
| Popis: | Stable, fluorescent Ag nanoclusters were prepared in aqueous solutions of Na(+) salt of the carboxylate-rich polymer poly(acrylic acid-co-maleic acid) under brief spells of UV irradiation. The nanoclusters were nearly spherical, with diameters within 1.90 ± 0.50 nm, but displayed a prominent red edge excitation shift (REES) of fluorescence upon exciting within the visible absorption band, indicating heterogeneity of energy level distributions. Spectroscopic studies revealed that irrespective of whether the nanoclusters are excited in their UV or visible absorption bands, their fluorescence always ensues from the same manifold of emissive states, with a broad range of fluorescence lifetimes from ∼150 fs to 1 ns. |
| Databáze: | OpenAIRE |
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