Optical Extinction Spectroscopy for characterization of metal nanoparticles fabricated by laser ablation

SCHINCA, DANIEL CARLOS; SANTILLÁN, JESICA MARÍA JOSÉ; MUÑETÓN ARBOLEDA, DAVID; SCAFFARDI, LUCÍA BEATRÍZ

Pucón, Región de la Araucanía, Chile

Congreso; RIAO - OPTILAS 2016 "IX REUNIÓN IBEROAMERICANA DE ÓPTICA (RIAO) - XII ENCUENTRO LATINOAMERICANO DE ÓPTICA, LÁSERES Y APLICACIONES (OPTILAS)"; 2016

Universidad de Chile

Colloidal suspensions of metal nanoparticles (NPs) have been an active area of research due to their many applications in sciences, engineering and biomedicine like diagnosis and treatment of illnesses, everyday utensils with antibactertial and autocleaning properties [1], ductility and elasticity control of material [2], among others. These applications are directly bounded to the size and structure of the NPs [3]. For this rea-son, different chemical and physical techniques were developed by several groups for a controlled fabrication of metal colloids. Among the latter, femtosecond laser ablation is frequently used to synthesize spherical NPs with typical sizes less than 20 nm [4].Characterization of the colloidal suspensions so obtained is traditionally carried out using electron microscopy (TEM, SEM) or atomic force microscopy (AFM). However, these techniques have the drawback of needing a large number of measurements to yield statistically reliable results. During the past years, our group has been working on the characterization of NPs by Optical Extinction Spectroscopy (OES), refining this technique for the determination of size, structure and concentration of metal NPs. The number of probed NPs is in the order of 1011, high enough statistics to ensure statistically reliable results. In this work we show the application of this technique to characterize silver, copper and nickel NPs fabricated by fs laser ablation of solid targets in liquids.References [1] H. H. Lara, E. N. Garza-Treviño, L. Ixteparan-Turrent, D. K. Singh, Au. Journal of Nanobiotechnology 9, (2011).[2] W. J. Stark, A. P. R. Stoessel, W. Wohlleben, A. Hafner, Chem. Soc. Rev. 44, 5793-5805 (2015).[3] V. H. Grassian, J. Phys. Chem. C 47, 18303?18313 (2008).[4] J. M. J. Santillán, M. B. Fernández van Raap, P. Mendoza Zélis, D. Coral, D. Muraca, D. C. Schinca, L. B. Scaffardi, J Nanopart Res 17, (2015).