GAS ANALYTICAL CHIP BASED ON LASER-MODIFIED TIN OXIDE Russian patent published in 2024 - IPC G01N27/407 

FIELD: gas analysis.

SUBSTANCE: devices for detecting gas mixtures using a multisensory approach. The gas analytical chip includes a dielectric substrate, on the front side of which a set of coplanar strip electrodes made of noble metal, thin-film thermistors and heaters are applied. The gas-sensitive tin dioxide layer is formed from a paste that is made by (1) mixing tin dioxide nanoparticles withα -terpineol in a weight ratio of 5:1 parts with the addition of a binder solution of polyvinylpyrrolidone/ethanol, composed in a ratio of 1:10, (2) the resulting dispersion is subjected to treatment with an ultrasonic homogenizer for 5 minutes and (3) dried for 24 hours at room temperature; (4) after fabrication, tin dioxide paste is applied to the surface of the multielectrode chip by screen printing and (5) annealed at 120°C for 15 minutes; (5) to differentiate the functional properties of the printed tin dioxide layer on the chip, it is treated with an Nd:YAG laser with a wavelength of 1064 nm, a laser pulse frequency of 65 kHz and a displacement speed of 500 mm/s, with different areas of the chip coated with a layer of tin dioxide, corresponding to various sensor elements, they are processed with a laser with different radiation densities, controlled by the laser current in the range of 24.8-26.7 A.

EFFECT: development of a gas analytical chip that allows for the selective determination of analytes from the gas phase, including those of one chemical nature, in low concentrations below 1 ppm.

5 cl, 12 dwg