Controlled Synthesis and Optical Properties of Pure Gold Nanoparticles |
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| Authors: | Abhimanyu K Singh Awadhesh K Rai Dane Bicanic |
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| Affiliation: | 1. Laser Spectroscopy Research Laboratory, Department of Physics , University of Allahabad , Allahabad, India;2. Laboratory of Biophysics, Department of Agrotechnology and Food Sciences , Wageningen University , HA Wageningen, The Netherlands |
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| Abstract: | Abstract Gold nanoparticles were synthesized by laser ablation of a gold metallic disc at wavelengths of 532 nm and 355 nm with 7 ns pulse duration in the pure water. The colloidal gold nanoparticles were characterized by ultraviolet-visible absorption spectroscopy, transmission electron microscopy, and fluorescence spectrometry. The presence of a surface plasmon resonance peak around ～ 524 nm indicates the formation of gold nanoparticles. The formation efficiencies of gold nanoparticles in colloids were found to increase when ablating the gold metallic disc with a laser having a longer wavelength. The size distributions of the gold nanoparticles thus produced were measured by transmission electron microscopy. A reduction in mean diameter of the particles was observed with a decrease in the laser wavelength under the irradiation at a high fluence of 25 mJ/pulse. The fluorescence spectroscopy demonstrated that these gold nanoparticles are fluorescent, showing a strong blue emission intensity at 458 nm. |
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| Keywords: | Fluorescence spectroscopy Gold nanoparticles Laser ablation Transmission electron microscopy |
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