METHOD TO PRODUCE MODIFIED OPTICAL CHEMOSENSORY FILMS BASED ON SILICA Russian patent published in 2011 - IPC C01B33/146 B82B3/00 B01J13/00 

FIELD: nanotechnologies.

SUBSTANCE: invention relates to nanotechnologies, in particular, to the method to produce optical structured chemosensory films based on silica particles with size of 5-8 nm with modified surface. The method includes production of a nanosol of spherical silica particles with size of 5-8 nm from the following mixture: tetraethoxysilane : water acidified with HCl to pH of 1.5-2, : ethanol = 1:6:5, ethanol maturing at 60-70°C for 2-4 hours, stabilisation of the nanosol by cetyltrimethylammonium chloride at mole ratio of cetyltrimethylammonium chloride : nanosol = 0.25, application of the nanosol at the substrate and production of the chemosensory film, at the same time to modify the silica nanoparticles a solution of the colloid silver-fluorescein complex is used, made by mixing 1% of fluorescein solution in ethanol, and 0.08% of colloid silver solution in the volume ratio of solutions 1:1, which is introduced into the matured and stabilised nanosol at the ratio of volumes of nanosol : complex solution equal to 3:2.

EFFECT: invention makes it possible to increase intensity of chemosensory film photoluminescence 2-2,5 times.

3 cl, 1 dwg, 1 ex