CuO Nanofibers Prepared by Electrospinning for Gas Sensing Application: Effect of Copper Salt Concentration
A simple and efficient electrospinning technique is employed for the preparation of high aspect ratio semiconducting p-type copper(II) oxide (CuO) nanofibers. Characterization studies including X-ray diffraction (XRD) and scanning electron microscopy (SEM) are employed to analyze the crystal structure and morphology of electrospun CuO nanofibers. The results of XRD and SEM confirm that the nanofibers are made of copper oxide in the form of interconnected nanograins. The 12 g sample with nanograin morphology and large specific surface areas providing the highest responses to 250 ppm ethanol, 250 ppm hydrogen and 2500 ppm liquefied petroleum gas (LPG) of 32.38%, 57.01% and 21.63%, respectively. The effect of salt concentration of copper(II) nitrate on gas sensing performance was investigated. The 12 g-device shows the best response to ethanol and LPG meanwhile the 6 g-device shows the best response to hydrogen. The devices show a good selectivity to hydrogen at both working temperatures of 350 and 400 °C. The best device shows a percentage response of 170% to 1000 ppm hydrogen at 250 °C.
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Document Type: Research Article
Affiliations: International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), Hanoi, Vietnam
Publication date: 01 August 2016
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