Department of Biomedical Engineering, Faculty of Mechanical Engineering, University of Zielona Góra, Zielona Góra, Poland.
Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
Acta Bioeng Biomech. 2020;22(1):165-177.
In this paper, electrochemical properties of the as-formed and thermally treated titanium dioxide (TiO2) nanotubes with diameter in the range of 20-100 nm and height in the range of 100-1000 nm were presented. In addition, the effects of annealing temperature (450-550 °C) on the electrochemical characteristics of these structures, as well as the influence of diameter and height of TiO2 nanotubes on these properties were examined. The results were referred to a compact TiO2 layer (100 nm thick).
The electrochemical test included open circuit potential, impedance spectroscopy and cyclic voltammetry measurements. The scanning electron microscope with energy dispersive spectroscopy analyser, x-ray photoelectron spectroscopy, and x-ray diffraction analysers were used for surface morphology characterisation as well as elemental, phase and chemical composition of TiO2 layers.
It was found that nanotubes with the diameter of 50 and 75 nm (height of 1000 nm) annealed at 550 °C exhibit the lowest impedance and phase angle values. However, the voltammetric detection of potassium ferricyanide indicated that the closest to 1 Ipc /Ipa ratio were shown by nanotubes with a diameter of 50 and 75 nm annealed at 450 °C.
On the basis of performed analysis, it can be stated that the TiO2 layer with nanotubes of 50 nm in diameter and of 1000 nm in height, annealed in 450 °C may be indicated as the ones having the most favourable sensing and biosensing properties.
本文介绍了直径在 20-100nm 范围内、高度在 100-1000nm 范围内的形成和热处理的二氧化钛（TiO2）纳米管的电化学性能。此外，还研究了退火温度（450-550°C）对这些结构的电化学特性的影响，以及 TiO2 纳米管的直径和高度对这些特性的影响。结果与致密的 TiO2 层（100nm 厚）有关。
电化学测试包括开路电位、阻抗谱和循环伏安法测量。扫描电子显微镜与能量色散光谱分析仪、X 射线光电子能谱仪和 X 射线衍射分析仪用于表面形貌表征以及 TiO2 层的元素、相和化学成分。
发现直径为 50nm 和 75nm（高度为 1000nm）的纳米管在 550°C 退火时表现出最低的阻抗和相角值。然而，铁氰化钾的伏安检测表明，直径为 50nm 和 75nm、在 450°C 退火的纳米管表现出最接近 1Ipc/Ipa 比值。
根据所进行的分析，可以指出直径为 50nm、高度为 1000nm 的 TiO2 层，在 450°C 退火时可能具有最有利的传感和生物传感特性。
