Patent ID: 9194834
Filing Date: 2015-11-24
Classification: G01N

Abstract:
1. A gas sensor of chemoresistor type having a multi-storey structure, the sensor comprising: a first storey comprising a sensing layer provided on an insulating layer, and measurement electrodes provided in contact with the sensing layer; a second storey comprising a support layer supporting a second sensing layer that is a layer of selectively-activatable material spaced from the sensing layer of the first storey, and second measurement electrodes in contact with said second sensing layer; wherein the first storey and the second storey each constitute a chemoresistor type gas sensing element, and an activation unit for controlling activation of the selectively-activatable layer; wherein the first and second storeys are arranged in series so that gas passes successively through the second storey to the first storey and the gas reaching the sensing layer of the first storey can be modified by activating the selectively-activatable material of the second storey.