Surface-enhanced photophysical processes of organic molecules in metal nanoparticles

Author: Tomáš Špringer
Supervisor: Prof. RNDr. Marek Procházka, Dr.
Type: Master

Abstract: Main goal of this MSc. Thesis was study of photoactive molecules (zinc and copper phthalocyanines and 5-[4-(4-Octyloxy-phenylazo)-phenoxy]-pentane-1-thiol) and their behavior onto gold metal nanoparticles using surface-enhanced Raman scattering (SERS) and UV-vis absorption spectroscopy. Stable and reproducible SERS-active substrates, citrate-reduced gold nanoparticles immobilized on silane-modified glass slides, were prepared and successfully used in this study. All studied molecules were successfully adsorbed on the gold substrates and their SERS spectra were obtained. Dependences on soaking time and on concentration of studied molecule in solution enabled us to compare adsorption processes for each molecule. Obtained results can help us to select suitable systems for study of enhanced photophysical phenomena of organic molecules on gold nanosubstrates.

Keywords: SERS, photoactive molecules, phthalocyanines, gold immobilized nanoparticles