Optical Properties of Molecule-Like Au25 Nanoparticles
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 9
Abstract
This paper describes the effect of solvent polarity on the optical properties of molecule-like Au25 nanoparticles. UV-Vis absorption and photoluminescence were measured using various organic solvents (aromatic vs. non-aromatic). The molar extinction coefficients and the relative quantum efficiency of Au25 were determined and correlated with the normalized empirical parameters of solvent polarity. The molar extinction was linearly decreased as increasing solvent polarity, but the relative quantum efficiency was significantly affected by aromatic solvent only. The HOMO-LUMO energy gap (1.32 – 1.33 eV) estimated from absorption band edges was not influenced by solvent polarity. However, the measured relative quantum efficiency was varied from 7.6 103 to 20.4 103 , depending on solvent polarity as well as the excitation wavelength.
Authors and Affiliations
Amit Patel, Michael C. On, Jai-Pil Choi
Keywords
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