Various products containing nanomaterials became widely utilized consumables in our daily life. Metal nanoparticles possessing surface plasmon resonance find targeted applications in sensing, curing oncological diseases and visualizing cells. The goal of this project is to synthesize colloidal solutions of nanoparticles of different nature employing femtosecond laser ablation of a target in organic solutions and apply these nanoparticles for surface enhanced Raman based sensing. In order to achieve this goal, we are planning to select the processing conditions of material targets and colloidal solutions with the ultra-short laser pulses in order to achieve effective nanoparticle synthesis and improve the monodispersity of the already synthesized nanoparticles.
KTU R&D&I Fund
While carrying out the project the femtosecond laser processing conditions of the metal targets in water ensuring highest generation yields of nanoparticles were determined. Yields reaching tens of mg/h for silver, gold and copper nanoparticles were achieved. Nanoparticle colloidal solutions exhibited pronounced absorption bands in the visible wavelength range. Based on the simulation results the absorption was addressed to the localized surface plasmon resonance. Experiments of the laser irradiation on the chemically synthesized silver colloidal solutions were also carried out. It was obtained that an irradiation of 30 min duration with an average power in the range of 100 mW modified the silver nanoparticles in a way that they exhibited greater enhancement of Raman scattering than pristine nanoparticles.
Period of project implementation: 2019-04-01 - 2019-12-31
Project coordinator: Kaunas University of Technology