Using femtosecond lasers to modify sizes of gold nanoparticles

Using femtosecond lasers to modify sizes of gold nanoparticles

Author Cordeiro, Thiago da Silva Google Scholar
de Matos, Ricardo Almeida Autor UNIFESP Google Scholar
de Oliveira Silva, Flavia Rodrigues Google Scholar
Vieira, Nilson Dias, Jr. Google Scholar
Courrol, Lilia Coronato Autor UNIFESP Google Scholar
Samad, Ricardo Elgul Google Scholar
Abstract Metallic nanoparticles are important on several scientific, medical and industrial areas. The control of nanoparticles characteristics has fundamental importance to increase the efficiency on the processes and applications in which they are employed. The metallic nanoparticles present specific surface plasmon resonances (SPR). These resonances are related with the collective oscillations of the electrons presents on the metallic nanoparticle. The SPR is determined by the potential defined by the nanoparticle size and geometry. There are several methods of producing gold nanoparticles, including the use of toxic chemical polymers. We already reported the use of natural polymers, as for example, the agar-agar, to produce metallic nanoparticles under xenon lamp irradiation. This technique is characterized as a "green" synthesis because the natural polymers are inoffensive to the environment. We report a technique to produce metallic nanoparticles and change its geometrical and dimensional characteristics using a femtosecond laser. The 1 ml initial solution was irradiate using a laser beam with 380 mW, 1 kHz and 40 nm of bandwidth centered at 800 nm. The setup uses an Acousto-optic modulator, Dazzler, to change the pulses spectral profiles by introduction of several orders of phase, resulting in different temporal energy distributions. The use of Dazzler has the objective of change the gold nanoparticles average size by the changing of temporal energy distributions of the laser pulses incident in the sample. After the laser irradiation, the gold nanoparticles average diameter were less than 15 nm.
Keywords Metallic Nanoparticles
Gold Nanoparticles
Femtosecond Lasers
Plasmon Resonances
Dispersive Filter
Nanoparticles Production
Nanoparticles Irradiation
Nanoparticles FragmantationSurface-Plasmon Resonance
Silver Nanoparticles
Metal Nanoparticles
Optical-Properties
Absorption
Ablation
Model
Language English
Date 2016
Published in Nanophotonics Vi. Bellingham, v. 9884, 2016.
ISSN 0277-786X (Sherpa/Romeo, impact factor)
Publisher Spie-int soc optical engineering
Origin http://dx.doi.org/10.1117/12.2227759
Access rights Closed access
Type Conference paper
Web of Science ID WOS:000378220200050
URI http://repositorio.unifesp.br/handle/11600/49487

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