Silver nanorods produced by femtosecond laser pulses
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2010
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ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 33.
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In this work we describe the study of a photoinduction method to produce silver nanorods using femtosecond laser pulses irradiation of silver solutions. The start
solutions were prepared by mixing autopolymerizable
resin and AgNO3 with water solutions, and illuminating
those with a Xenon lamp. Various concentrations and
irradiation times were used, and these irradiation processes produce spherical silver nanoparticles with sizes
ranging from 30 to 100 nm. Afterwards, 30 femtosecond ultrashort pulses with energy around 200 microjoules were used to irradiate the nanoparticles solutions.
All solutions were characterized by ultraviolet-visible
spectroscopy and TEM microscopy. We observed that
these ultrashort pulses irradiations, besides decreasing
the spherical nanoparticles sizes, can create nanorods
depending on the irradiation parameters. No additives,
such as solvents, surfactants or reducing agents, were
used in the procedures. The spherical nanopaticles size
reduction can be explained by a multiphoton process
that promotes the photoexcitation of surface the plasmon band, charging the particles up to the limit were
Coulombic rupture occurs due to charge excess, resulting in size reduction. In the early stage of the process,
the majority of smaller silver particles are directed to
growing into nanorods with uniform diameters in the
range from 3 to 6 nanometers. The nanorods solutions
have high water solubility, good colloidal stability, stable fluorescence properties, and are amenable in deriving various functional nanoprobes.
Como referenciar
SAMAD, RICARDO E.; CORDEIRO, THIAGO da S.; FREITAS, ANDERSON Z. de; VIEIRA JUNIOR, NILSON D.; NABESHIMA, CAMILA; MATOS, RICARDO A. de; COURROL, LILIA C. Silver nanorods produced by femtosecond laser pulses. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 33., 10-14 de maio, 2010, Aguas de Lindoia, SP. Resumos... Disponível em: http://repositorio.ipen.br/handle/123456789/21207. Acesso em: 30 Dec 2025.
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