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Thermo-optical properties of metallic nanoparticles in colloidal systems

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Abstract

Nanoparticles have a huge amount of applications in multiple fields of siencie like optics, electronics, biomedicine and materials manufacturing. These applications, among other reasons, have generated an exponential increse in their study and characterization. The existence of different size-depending properties of nanoparticles allows for the use of different techniques for characterization. This paper shows the thermo-optical properties of nanoparticles in colloidal suspensions. Spherical nanoparticles of different metals (gold, silver and iron), obtained by laser ablation, were characterized using thermal lens spectroscopy pumping at 532 nm with a 10 ns pulse laser-Nd-YAG system. The obtained nanoparticles were stabilized in time by several different surfactants in water with different molar concentrations. The morphology and size of the nanoparticles was determined by dynamic light scattering (DLS) and UV-Visible techniques. Moreover, the plasmonic resonance bands in nanoparticles are responsible for the light optical absorption. Also, the positions of the absorption maximum and the bandwidth in the UV-visible spectrum are given by the morphological features of these systems. Thermo- optical constant as the thermal diffusion, the thermal diffusivity and (dn/dT) are functions of the size of the nanoparticle and the dielectric function of the media. For these reasons, the signal of the thermal lens (TL) is also dependent on the size of the nanoparticles. An analysis of the TL signal reveals an inverse dependence of the thermo- optical functions and size of the nanoparticles. This methodology can be used to evaluate and characterize nanoparticles systems in different ways.

© 2014 Optical Society of America

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