UV photoelectric properties of aligned TiO2 nanotubes with different wall thickness

• Published in: Physica. E, Low-dimensional systems & nanostructures Vol. 126; p. 114467
• Main Authors: Wu, Bozhi, Zhou, Ming, Zhang, Xueting, Fan, Zhengpeng, Wang, Kaiping, Ma, Pengpeng, Liu, Jinzhu, Su, Maogen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2021
• Subjects: Aligned nanotubes; Electrospinning; Photodetectors; Pulsed laser deposition; TiO2; Aligned nanotubes; Electrospinning; Pulsed laser deposition; Photodetectors; TiO2
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2020.114467

Horizontally ordered TiO2 nanotubes with different wall thicknesses were fabricated by three processes: electrospinning, pulse laser deposition and annealing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy X-ray photoelectron spectroscopy (XPS) and ultraviolet–visible (UV–vis) absorption were used to characterize the morphology, crystal structure, surface element composition and band gap of the nanotubes. The photodetectors were fabricated by assembling horizontally ordered TiO2 nanotubes with different wall thickness on the gold interdigital electrode, and their ultraviolet (UV) detection was compared. The results indicated that the TiO2 nanotubes with a wall thickness of 39 nm have the better UV response and fast response recovery speed under 365 nm illumination with power density of 4.9 mW/cm2. The UV response mechanism and advantages of the horizontally ordered TiO2 nanotubes were also discussed. •Highly ordered centimeter-long TiO2 nanotubes with different wall thickness were successful preparation.•The planar photodetectors have been fabricated by combining interdigitated gold electrodes and aligned ultra-long nanotubes.•UV photoelectric properties of aligned TiO2 nanotubes with different wall thickness were investigated.