Low temperature grown ZnO nanotubes as smart sensing electrode for the effective detection of ethanolamine chemical

The aligned zinc oxide (ZnO) nanotubes (NTs) thin film was grown on fluorine doped tin oxide (FTO) substrates by low temperature solution method and utilized as a smart working electrode for the fabrication of ethanolamine chemical sensor. The synthesized ZnO possessed well crystalline tubular morphology with typical hexagonal wurtzite phase. The aligned ZnO NTs thin film presented a good optical band gap of ∼3.31 eV which was nearly close to the bulk ZnO nanomaterials. The fabricated ethanolamine chemical sensor based on aligned ZnO NTs thin film electrode showed significantly high sensitivity of ∼37.4×10−4 mA mM−1 cm−2, good linearity of ∼0.05 mM-1 mM and the detection limit of ∼19.5 µM with correlation coefficient (R) of ∼0.9850.