METHOD OF PRODUCING GAS MULTISENSOR OF CONDUCTOMETRIC TYPE BASED ON TIN OXIDE Russian patent published in 2017 - IPC G01N27/407 

FIELD: chemistry.

SUBSTANCE: method is carried out by electrochemical deposition in a vessel equipped with a reference electrode and a counter electrode and filled with a solution containing nitrate anions and tin cations SnCl₂ with the concentration of 0.05-0.15 mol/l and NaNO₃ with the concentration of 0.1-0.3 mol/l, a layer of tin oxide in the form of nanocrystals is deposited by cyclic voltammetry on a dielectric substrate equipped with strip electrode sensors acting as a working electrode in a solution, pH of which is 1.45±0.02 by changing the potential applied to the sensor electrodes from 0 V to the negative side relative to the reference electrode potential to the values of, at least, -1.7 V with the potential sweep rate in the range of 0.02 to 0.25 V/s, then the potential is increased to the value not higher than +2.0 V and the reverse reduction to 0 V with the same sweep rate. The described cyclic sequence of potential changes is applied repeatedly before the peak disappears on the curve of cyclic voltammetry.

EFFECT: providing the possibility of producing a gas-sensitive layer of tin oxide directly on a substrate without metallic tin impurity.

6 cl, 9 dwg