Enhancement of Functionalized Carbon Nanotubes Gas Sensor by Adding Metal Oxide Nanoparticles

Abstract

Functionalized-multi wall carbon nanotubes (F-MWCNTs) and functionalized-single wall carbon nanotubes (F-SWCNTs) were well enhanced using Cobalt oxide (CoO) Nanoparticles. The sensor structure consists of a layer of material (F-MWCNTs/CoONPs) and (F-SWCNTs/CoO NPs) by adding 0.0005g of CoONPs to 1.5ml of the CNTs mixtures which are deposited on n- type porous silicon (PS) by the drop casting method. These two sensors have high sensitivity to NO2 at room temperature. The analysis indicated that the (Functionalized-MWCNTs/CoONPs) have a better performance than (Functionalized-SWCNTs/CoONPs) when exposed to NO2 gas. The F-SWCNTs/CoONPs gas sensor showed sensitivity about (19.1 %) at room temperature with a response time of 17 seconds, while F-MWCNTs/CoONPs sensor showed better sensitivity (39 %) at room temperature with a response time of 13 seconds. The sensor shows very repeatable sensor performance, complete recovery and adequate response.