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Information × Registration Number 0212U008793, 0110U004762 , R & D reports Title Development of the method of ultrasensitive surface-plasmon-enhanced diagnostics of molecular, biological and colloidal nanosystems for catalysis, medicine and enviroment protection popup.stage_title Head Valakh Mykhailo Yakovych, Доктор фізико-математичних наук Registration Date 02-01-2013 Organization Institute of Semiconductor Physics of National Academy of Sciences of Ukrain popup.description2 To implement the objectives of the third phase of the project were developed and investigated a fundamentally new type of substrates for SERS-spectroscopy-based films with monodisperse nanoparticles with the structure of "core-shell" with a core of single crystals of gold (d <5-50 nm) and thin (a few nanometers) dielectric coating of amorphous silicon dioxide. The latter prevents agglomeration of Au nanocrystals and provides long-term stability of the amplifying properties of the substrate. It was found that the silica-coated gold nanoclusters Raman amplification of the signal is much smaller than the bare gold clusters and essentially depends on the thickness of the dielectric shell. On the other hand the presence of the shell provides long-term stability of the reinforcing properties of SERS-substrates. Studies on other types of SERS-substrates, which are also films of nanoparticles of "core-shell" system, but in this case, the core is SiO2, and shell - gold nanoparticles. The latter do not form a continuous shell. It is forming nanoislands on a surface of a SiO2. This structure increases the electric field radiating dipole not only by adjusting the frequency of the plasmon absorption band of the frequency of the exciting laser radiation, but also because of the contribution to the enhancement of the scattering electric fields, the so-called hot spots. Shows that all of the above types of nanostructured SERS-substrates effectively reinforce biological agents as Tilorone which is an inducer of interferon in the body. Raman signal amplification was obtained on other biological objects using SERS-spectroscopy. Product Description popup.authors Джаган Володимир Миколайович Юхимчук Володимир Олександрович Яремко Анатолій Михайлович popup.nrat_date 2020-04-02 Close