Li Wanshun, Zhang Shiqiu, Li Fei
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China.
Nanomaterials (Basel). 2024 Nov 26;14(23):1893. doi: 10.3390/nano14231893.
As a unique form of TiO, TiO nanotube arrays (TiONTAs) have been widely used. TiONTAs are usually prepared by Ti foil, with little research reporting its preparation by Ti mesh. In this paper, TiONTAs are prepared on a Ti mesh surface via an anodic oxidation method in the F-containing electrolyte. The optimal parameters for the synthesis of TiONTAs are as follows: the solvent is ethylene glycol and water; the electrolyte is NHF (0.175 mol/L); the voltage is 20 V; and the anodic oxidation time is 40 min without chemical polishing. However, there is a strange phenomenon where the nanotube arrays grow only at the intersection of Ti wires, which may be caused by chemical polishing, and the other areas, where TiONTAs cannot be observed on the surface of Ti mesh, are covered by a dense TiO film. New impurities (the hydrate of TiO or other products) introduced by chemical polishing and attaching to the surface of the Ti mesh reduce the current of anodic oxidation and further inhibit the growth of TiO nanotubes. Hence, under laboratory conditions, for commercially well-preserved Ti mesh, there is no necessity for chemical polishing. The formation of TiONTAs includes growth and crystallization processes. For the growth process, F ions corrode the dense TiO film on the surface of Ti mesh to form soluble complexes ([TiF]), and the tiny pores remain on the surface of Ti mesh. Given the basic photoelectrochemical measurements, TiONTAs without chemical polishing have better properties.
作为二氧化钛的一种独特形式，二氧化钛纳米管阵列（TiONTAs）已被广泛应用。TiONTAs通常由钛箔制备，很少有研究报道用钛网制备。本文通过在含氟电解液中采用阳极氧化法在钛网表面制备TiONTAs。合成TiONTAs的最佳参数如下：溶剂为乙二醇和水；电解液为NHF（0.175mol/L）；电压为20V；阳极氧化时间为40分钟，无需化学抛光。然而，存在一种奇怪的现象，即纳米管阵列仅在钛丝的交叉处生长，这可能是由化学抛光引起的，而在钛网表面无法观察到TiONTAs的其他区域则被致密的二氧化钛膜覆盖。化学抛光引入并附着在钛网表面的新杂质（二氧化钛水合物或其他产物）会降低阳极氧化电流，并进一步抑制二氧化钛纳米管的生长。因此，在实验室条件下，对于保存良好的商业钛网，无需进行化学抛光。TiONTAs的形成包括生长和结晶过程。对于生长过程，氟离子腐蚀钛网表面的致密二氧化钛膜以形成可溶性络合物（[TiF]），并且在钛网表面留下微小的孔隙。基于基本的光电化学测量，未经化学抛光的TiONTAs具有更好的性能。
