Enhancement in NO2 and H2-Sensing Performance of CuxO/TiO2 Nanotubes Arrays Sensors Prepared by Electrodeposition Synthesis

Araa Mebdir Holi, Ghufran Abd AL-Sajada, Asla Abdullah Al-Zahranib, Asmaa Soheil Najm

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Abstract

The CuxO/TiO2 nanotubes arrays are fabricated in two stages. Firstly, TiO2-NTs are grown by the Ti-foil anodization process and then annealed for 2h at 500 oC. Subsequently, CuxO thin film was deposited with different deposition times on the nanotubes by electrochemical cathodic reaction, then heated twice, once at 200 oC in the air and then at 300 oC in the closed furnace for 2 h, respectively. Pure-TNT and CuxO/TNTs heterostructure are characterized by XRD, FE-SEM, EDX, Hall effect, and as a gas sensor. Results show that the gas sensor (CuOx=1 /TiO2 for NO2 and H2 gases) prepared at the time (1 min) is higher than the pure TiO2-NTs and also higher than Cux=2O/TiO2   which were synthesized at various times 3, 5, 7, and 10 mins.

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Nano Biomedicine and Engineering.

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