Gas-sensing properties of multi-walled carbon-nanotube sheet decorated with cobalt oxides

Abstract

A hybrid, nanocomposite carbon nanotube (CNT) sheet decorated with cobalt oxide (Co₃O₄) serving as gas sensor was fabricated for detecting hydrogen (H₂). In order to improve performance of the sensor, Co₃O₄ nanoparticles were decorated on the surface area of the CNT sheets by electrodeposition, which is an easy and simple method for fabricating hybrid composites. Moreover, the effect of surface area on sensitivity of CNT/Co₃O₄ composite was further investigated, and we found the mean sizes of the Co₃O₄ nanoparticles significantly affected the sensitivity of the composite.