Effects of temperature on laser-induced shape modification of silver nanoparticles embedded in glass

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2009

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The influence of temperature on the laser-induced shape modification and dissolution of silver nanoparticles in glass is investigated theoretically and experimentally. Both the local transient temperature increase in close vicinity to a nanoparticle after laser pulse excitation and effects of permanent heating of the whole sample are discussed. It is shown that the heat-affected zone reaching transiently temperatures above 500 K around a nanoparticle should be limited to a few nanometers to enable the intended transformation of initially spherical nanoparticles to prolate shapes with high aspect ratio by irradiation with a few hundred laser pulses. Already relatively small temperature increase of the sample prior to or during irradiation, provided by external sample heating or temperature accumulation in the focal volume at high laser repetition rates, causes partial destruction of the nanoparticles due to increased diffusion length of the emitted Ag cations. © 2009. American Chemical Society.

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Forschungsinformationssystem der UHH

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