Abstract
In this report, a novel CeO2/MWCNTs nanocomposite was synthesized using a simple hydrothermal method and examined structural, morphological and elemental composition using powder X-ray diffraction, transmission of electron microscopy, dispersive energy spectra, and N2 adsorption-desorption analysis. The XRD and TEM findings indicate that both pure nanocomposite and CeO2/MWCNTs exhibit cubic structure and CeO2 nanoparticles (30–60 nm in diameter) are distributed uniformly on the surface of MWCNTs. The gas sensing properties of the as synthesized composites were tested using fiber optic clad modified method at room temperature with ethanol and ammonia gases. The results showed that nanocomposite CeO2/MWCNTs demonstrated high sensitivity (75 × 10−3 k/Pa), rapid response (26 s) and recovery time (35 s). The newly prepared sensor CeO2/MWCNTs opens up exciting perspectives for nanosized sensor devices to develop. The possible mechanism for gas sensing has also been discussed in detail.
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