ИСТИНА

Using of the 2D semiconductor materials for modification of the surfaces is the prospective method for formation of multifunctional composites on the planar systems. Combination of the functionality of silver, gold or semiconductor nanoparticles and photocatalytic activity of titania nanosheets (TNS) or graphitic carbon nitride (g-C3N4) allow to produce composites with very fruitful properties as component of surface-enhanced Raman spectroscopy (SERS) planar sensors. Titania nanosheets is photocatalytic material, which can strongly bind with metal nanoparticles, and, therefore, materials based on it are perspective in development of reusable substrates for reproducible analytical systems. At the same time on the surface of titania particles and graphitic carbon nitride may be realizes photocatalytic chemical processes of organic molecules oxidation. So due to photocatalytic properties of titania and graphitic carbon nitride, surface of the substrates can be cleaned after SERS measurement by UV irradiation, and as one of the simple examples of the multifunctionality the substrates can be used repeatedly. The 2D composites like g-C3N4/WO3 are great interest in heterogeneous photocatalysis due to their effective separation of charge carriers at the contact with semiconductor phases. We suppose that these materials also very prospective like component of multifunctional planar sensors. The photocatalytic processes on the surface may be used for the hydrogen peroxide generation directly in the analyzing system under UV irradiation. Authors shown that the synthesis of the multifunctional substrates with optimized parameters allows achieving enhancement SERS signal coefficient for planar sensors. Moreover, the obtained substrates show high reproducible signal throughout the surface.