Abstract
Functionalized-multi wall carbon nanotubes (F-MWCNTs) and functionalized-single wall carbon nanotubes (F-SWCNTs) were well enhanced using CoO Nanoparticles. The sensor device consisted of a film of sensitive material (F-MWCNTs/CoONPs) and (F-SWCNTs/CoO NPs) deposited by drop- casting on an n-type porous silicon substrate. The two sensors perform high sensitivity to NO2 gas at room temperatures. The analysis indicated that the (F-MWCNTs/CoONPs) have a better performance than (F-SWCNTs/CoONPs). The F-SWCNTs/CoONPs gas sensor shows high sensitivity (19.1 %) at RT with response time 17 sec, while F-MWCNTs/CoONPs gas sensor show better sensitivity (39 %) at RT with response time 13 sec. The device shows a very reproducible sensor performance, with high repeatability, complete recovery, and adequate response. A demonstration of the improvement in sensing of NO2 gas using CoO-functionalized nanotubes is provided.
Highlights
Expanding worries about pollution have prompted a rising need for gas sensors for a wide scope of utilizations
Experimental results revealed an increase in F-MWCNT conductivity when exposed to oxidizing gases such as NO2
The charge carriers of F-SWCNTs are electrons that is the reason for the increase in resistance when exposed to NO2 gas but in F-MWCNTs the charge carriers are holes which leads to a decrease in resistance when exposed to NO2 gas
Summary
Expanding worries about pollution have prompted a rising need for gas sensors for a wide scope of utilizations. Metal oxide gas sensors have been broadly utilized for the discovery of various gases [1]. The use of carbon nanotubes decorated with metal nanoparticles has been proposed with promising results to improve the chemical selectivity of gas sensors [8].
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