Centre National De La Recherche Scientifique

Centre National De La Recherche Scientifique-cnrs

Universite Paris Cité

Vincent Fleury

Thierry Devers

Lévi Allam

Provided is a gas molecule sensor, characterized in that the sensing element is a polycrystalline tin oxide film having a thickness less than 1 &#x3bc;m. The sensing element is produced by electrolytic deposit of a tin film on an insulating support in an electromechanical cell, where the anode is comprised of tin and the cathode is a conductive film applied on the surface of the insulating support at one of its ends, the two electrodes being separated by an electrolyte comprised of a tin salt solution, and by passing a constant current through said cell. The deposit step is followed by an oxidizing step.

Sensors for reducing gas molecules

Provided is a process for metallizing an insulating substrate by depositing a uniform thin film of a metal on the insulating substrate. The process comprises placing the insulating substrate in an electrochemical cell which contains as the electrolyte a solution of a salt of the metal in a solvent, and which comprises an anode of the metal and a cathode in direct contact with the insulating substrate. A conducting film, which will constitute the cathode, is initially applied to one end of the substrate. The substrate is placed in the electrochemical cell in such a way that the surface to be metallized is vertical and the cathode is located in the upper part. A current is imposed on the electrochemical cell with an intensity such that it creates a current density of between 1 and 50 mA/cm in the horizontal section of the electrochemical cell level with the growth front of the film which is deposited.

Growing community of inventors

Paris, France

Vincent Fleury