Investigating solvent effects on aggregation behaviour, linear and nonlinear optical properties of silver nanoclusters
| Autor: | Nishar Hameed, Saju Joseph, M. S. Kala, Abhijit Saha, Oluwatobi S. Oluwafemi, Anju K. Nair, Sabu Thomas, R. Aravinda Narayanan, Sreekanth Perumbilavil, Nandakumar Kalarikkal, K. B. Bhavitha |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Chemistry Organic Chemistry Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Nanoclusters Inorganic Chemistry Dynamic light scattering Density functional theory Electrical and Electronic Engineering Physical and Theoretical Chemistry Solvent effects 0210 nano-technology Spectroscopy Absorption (electromagnetic radiation) High-resolution transmission electron microscopy |
| Zdroj: | Optical Materials. 73:695-705 |
| ISSN: | 0925-3467 |
| Popis: | We herein report the solvent effects on the aggregation, linear and nonlinear optical properties of silver nanoclusters synthesised using three solvents namely; ethanol, acetone and isopropanol. The Ag clusters were characterized using UV–Visible (UV–vis) and photoluminescence (PL) spectroscopy, Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), small angle X-ray scattering (SAXS), dynamic light scattering (DLS), and open aperture Z-Scan measurements. Density functional theory (DFT) calculations at the B3PW91 level of theory, were done to compute the electric dipole, quadrupole, octapole and hexadecapole moment of mercaptosuccinic acid and mercaptosuccinic acid-Ag 9 cluster in three solvents. Linear optical properties show characteristic absorption profile with quantum confinement at different wavelengths for all the three clusters. The Open aperture Z-scan measurement in Ag clusters establishes the optical limiting properties which arise mostly from excited state absorption (ESA) and relatively weak saturable absorption (SA). The nonlinear optical behaviour varies within the three clusters with maximum optical limiting value obtained for the clusters synthesised using acetone. The theoretically computed hyperpolarizabilities together with z-scan measurements establish the solvent effect on the clusters and their potential applications in optical limiting devices. |
| Databáze: | OpenAIRE |
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