Gas sensitive materials for gas detection and method of making

Details Gas sensitive materials for gas detection and method of making Gas sensitive materials for gas detection and method of making

G - Physics

01

N

G01N 27/12 (2006.01)

Patent

CA 2662697

A gas sensitive material comprising SnO2 nanocrystals doped with In2O3 and an oxide of a platinum group metal, and a method of making the same. The platinum group metal is preferably Pd, but also may include Pt, Ru, Ir, and combinations thereof. The SnO2 nanocrystals have a specific surface of 7 or greater, preferably about 20 m2/g, and a mean particle size of between about 10 nm and about 100 nm, preferably about 40 nm. A gas detection device made from the gas sensitive material deposited on a substrate, the gas sensitive material configured as a part of a current measuring circuit in communication with a heat source.

L'invention concerne un matériau sensible aux gaz qui comprend des nanocristaux de SnO2 dopés avec In2O3 et un oxyde d'un métal du groupe du platine, et son procédé de fabrication. Le métal du groupe du platine est de préférence Pd, mais peut inclure également Pt, Ru, Ir, et des combinaisons de ces composés. Les nanocristaux de SnO2 ont une surface spécifique de 7 ou plus, de préférence d'environ 20 m2/g, et une taille moyenne de particule comprise entre environ 10 nm et environ 100 nm, de préférence d'environ 40 nm. Un dispositif de détection de gaz est fabriqué à partir de ce matériau sensible aux gaz déposé sur un substrat, le matériau sensible aux gaz étant configuré en tant que partie d'un circuit de mesure de courant en communication avec une source de chaleur.

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