Improved Working Model for Interpreting the Excitation Wavelength- and Fluence-Dependent Response in Pulsed Laser-Induced Size Reduction of Aqueous Gold Nanoparticles

2010 ◽  
Vol 115 (12) ◽  
pp. 5063-5072 ◽  
Author(s):  
Daniel Werner ◽  
Shuichi Hashimoto
Keyword(s):  
Gold Nanoparticles ◽  
Pulsed Laser ◽  
Size Reduction ◽  
Excitation Wavelength ◽  
Working Model

Size Reduction of Gold Nanoparticles by Pulsed Laser Ablation and Re-Irradiation in Water Media

2011 ◽  
Vol 695 ◽  
pp. 174-177 ◽  
Author(s):  
Pichitchai Pimpang ◽  
Duangmanee Wongratanaphisan ◽  
Atcharawan Gardchareon ◽  
Supab Choopun
Keyword(s):  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Zeta Potential ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Size Reduction ◽  
Au Nps ◽  
Vis Spectroscopy ◽  
Water Media ◽  
Cover Slide

Gold nanoparticles (Au NPs) were prepared by using pulsed laser ablation with and without cover slide. The cover slide was used to confine atoms/ions in order to reach supersaturation condition. The obtained Au NPs were investigated by UV-vis spectroscopy, transmission electron microscopy (TEM), and zeta potential measurement. The absorbance spectra exhibited its absorption peak at around 520 nm for both Au NPs ablating with and without cover slide. It was found that Au NPs ablating with cover slide exhibited smaller size and size distribution (10.6 ± 5.9 nm) than those of without cover slide (34.1 ± 21.5 nm) at laser power of 5.00 mJ/pulse. This is due to supersaturation effect and re-irradiation effect caused by cover slide that trapped atoms/ions of gold and trapped Au NPs, respectively. Also, the zeta potential of Au NPs had a negative value suggesting negative surface charge. The lowest zeta potential was observed for Au NPs ablating with cover slide at 5.00 mJ/pulse and it was in consistent with an observation of the highest pH value. In addition, the Au NPs ablating with cover slide at 5.00 mJ/pulse showed the least change with time indicating the most stable Au NPs which was in consistent with the lowest zeta potential results. Thus, pulsed laser re-irradiation could be used for size reduction of Au NPs prepared by pulsed laser ablation in water media.

Size reduction of gold particles in aqueous solution by pulsed laser irradiation

1998 ◽  
Vol 72 (7) ◽  
pp. 789-791 ◽  
Author(s):  
Hideaki Kurita ◽  
Akinori Takami ◽  
Seiichiro Koda
Keyword(s):  
Aqueous Solution ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Size Reduction ◽  
Gold Particles ◽  
Pulsed Laser Irradiation

Shape tailoring of hexagonally ordered triangular gold nanoparticles with nanosecond-pulsed laser light

2009 ◽  
Vol 255 (24) ◽  
pp. 9822-9825 ◽  
Author(s):  
Rodica Morarescu ◽  
David Blázquez Sánchez ◽  
Nils Borg ◽  
Tigran A. Vartanyan ◽  
Frank Träger ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Laser Light ◽  
Pulsed Laser ◽  
Nanosecond Pulsed Laser ◽  
Hexagonally Ordered

scholarly journals Optimization of Nonspherical Gold Nanoparticles for Photothermal Therapy

2019 ◽  
Vol 9 (20) ◽  
pp. 4300
Author(s):  
Paerhatijiang Tuersun ◽  
Xiayiding Yakupu ◽  
Xiang’e Han ◽  
Yingzeng Yin
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Photothermal Therapy ◽  
Therapeutic Agents ◽  
Tissue Type ◽  
Excitation Wavelength ◽  
Objective Functions ◽  
Design Tolerance ◽  
T Matrix ◽  
Selection Of

Previous investigations devoted to the optimization of nonspherical gold nanoparticles for photothermal therapy (PTT) encountered two issues, namely, the appropriate selection of objective functions and the processing of particle random orientations. In this study, these issues were resolved, and accurate optimization results were obtained for the three typical nonspherical gold nanoparticles (nanospheroid, nanocylinder, and nanorod) by using the T-matrix method. The dependence of the optimization results on the excitation wavelength and the refractive index of tissue was investigated. Regardless of the excitation wavelength and tissue type, gold nanospheroids were found to be the most effective therapeutic agents for PTT. The light absorption ability of optimized nanoparticles could be enhanced by using a laser with a longer wavelength. Finally, the design tolerance for the different sizes of nanoparticles was provided.

Processing condition influence on the characteristics of gold nanoparticles produced by pulsed laser ablation in liquids

2013 ◽  
Vol 274 ◽  
pp. 105-109 ◽  
Author(s):  
R.G. Nikov ◽  
A.S. Nikolov ◽  
N.N. Nedyalkov ◽  
P.A. Atanasov ◽  
M.T. Alexandrov ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Processing Condition ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Laser Ablation In Liquids
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