CPC G01N 27/127 (2013.01) [G01N 33/004 (2013.01)] | 5 Claims |
1. A method of fabricating a sensor for sensing carbon dioxide (CO2), comprising: providing a substrate; disposing a pair of electrodes on the substrate; providing a predetermined amount of multi-walled carbon nanotubes (MWCNTs); oxidizing the MWCNTs with a mixture of acids at a first predetermined temperature and for a first predetermined amount of time; diluting, decanting and centrifuging the oxidized multi-walled carbon nanotubes (O-MWCNTs); rinsing the O-MWCNTs in water to produce purified O-MWCNTs; drying the purified O-MWCNTs at a second predetermined temperature for a second predetermined amount of time to produce purified O-MWCNTs in dry powder form; forming a solution consisting of water, the purified O-MWCNTs in dry powder form and iron oxide (Fe2O3) nanoparticles so as to produce a uniform suspension; depositing the uniform suspension onto the electrodes; and thereafter, baking the substrate so as to transform the uniform suspension into a dry (CO2) sensing material.
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