I would like to see a clearer distinction between nanoporous/nanotubular films. For example, if a thin layer of oxide with a low content of fluorine is formed on the upper surface of the TiO2 films is it a nanotubes or a nanoporous structure? What degree of dissolution of the fluorine-enriched layer between the nanotubes is necessary for the sample to be attributed to nanotubes?
Dear Zakir! Try to check out papers:
DOI: 10.1088/1361-6528/ac317e, DOI: 10.3390/catal12091011,
DOI: 10.3390/molecules27228080, DOI: 10.1134/S1990793122040224
The TiO2 NTs were synthesized by electrochemical anodization of titanium foils in an ethylene glycol based electrolyte solution containing 0.3 wt% NH4F and 2 vol% deionized (DI) water at constant potential (50 V) for 1 h at room temperature.
if you use 0.3 to 0.5 % NH4Fin ethylene glycol you should get nanotubes. I would recommend to use at least 10 to 12 wt.% H2O. let me know if you need some papers and will send them to you privately.
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