Porovnaní citlivosti Ramanovy spektroskopie kapkově nanášených povlaků a povrchem zesílené Ramanovy spektroskopie při studiu biologicky významných molekul

Sayedová, Shirin

The main objective of this work was to compare the sensitivity of two Raman spectroscopy methods, namely the method of drop coating deposition Raman spectroscopy and surface-enhanced Raman spectroscopy for selected biologically significant molecules: dipicolinic acid, acetylsalicylic acid, methylene blue and riboflavin. For the DCDR experiments three hydrophobic surfaces were used: commercial substrate Tienta, polished CaF2 substrateand surface with copper nanoparticles with a gradient of hydrophobicity. Two commercial surfaces were used for the SERS method. Both techniques are suitable for sample measurement at low concentrations and with small initial volumes of solutions. The DCDR method, in contrast to the SERS method, allowed to work with higher excitation radiation power. The SERS technique was markedly more sensitive for a selection of suitable SERS active surface. The spectra obtained by the SERS method were influenced by the way of adsorption of the molecules to the surface. By studying the surface with a gradient of hydrophobicity, we have revealed an effect on the shape of dried drops. The dependence on Raman intensity was not found in the case of methylene blue. For both methods we determined the limit concentrations of solutions of measured molecules that can be detected. We have shown that the...

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