METHOD FOR PRODUCING NANOSCALE TITANIUM DIOXIDE WITH VARIABLE OPTICAL PROPERTIES MODIFIED WITH METALLIC PLASMON NANOPARTICLES Russian patent published in 2022 - IPC C01G23/53 C01G23/08 B82B3/00 B82Y30/00 B82Y40/00 

FIELD: electrical engineering; electronics.

SUBSTANCE: invention relates to the synthesis of nanoscale titanium dioxide modified with metallic plasmon nanoparticles of noble metal, which can be used to create highly efficient solar cells and electronic equipment materials. The method consists in preparation of a solution of a titanium-containing precursor consisting of sodium borohydride, isopropyl alcohol and titanium tetraisopropylate, and addition of a noble metal precursor, isopropyl alcohol and nitric acid to the mentioned solution, followed by mixing, centrifugation and washing with distilled water to remove residues of impurity ions, drying at a temperature of 150°C to remove water residues. At the same time, gold or silver is used as noble metal. To prepare the solution of a titanium-containing precursor, the required amount of sodium borohydride is weighed by precise weighting and quantitatively transferred to a beaker, isopropyl alcohol is poured into it, and the beaker is mounted on a magnetic mixer, titanium tetraisopropylate is poured into the resulting mixture, and the solution is mixed for 15-20 min. Next, the precursor of corresponding noble metal is weighed by precise weighting, quantitatively transferred to a beaker and dissolved with constant mixing in isopropyl alcohol, then, nitric acid is pipetted and added to the beaker, distilled water is poured at the final stage, thus obtaining the initial precipitation solution. Above a beaker with a solution of titanium tetraisopropylate located on the magnetic mixer, a burette is installed in a tripod with the initial precipitation solution, which is poured drop by drop with constant mixing for 40 min, the solution is left on the magnetic mixer until the gelation process is completed, and after centrifugation, washing and drying of gel at the final stage, it is calcined for 3 h at a temperature of 500-800°C with the production of nanoscale titanium dioxide modified with plasmon nanoparticles of gold or silver, with the following ratio of components, wt.%: plasmonic gold or silver nanoparticles 0.001-5; titanium dioxide nanoparticles – the rest. Modification of nanoscale titanium dioxide by metallic plasmon nanoparticles leads to the appearance of additional absorption areas in wavelength ranges of 390-420 nm and 500-600 nm.

EFFECT: changing the concentration of metallic plasmon nanoparticles of silver and gold in nanoscale titanium dioxide allows varying the intensity of absorption of incident light at certain wavelengths characteristic of the surface plasmon resonance of silver and gold nanoparticles, as well as a gap width, thereby providing the specified spectral characteristics of material based on nanoscale titanium dioxide with variable optical properties.

1 cl, 7 dwg, 6 ex