Mechanism of nanotubular Ta2O5 via anodization in NH4F/H2SO4/H2O solution / Mahzaton Aqma Abu Talip ...[et al.]

The main subject of many studies in anodization of
Ta2O5 is to investigate the role of electrolyte composition on
nanostructure Ta2O5 formation. However, the simple and clear
explanation on how electrolyte composition affects the
mechanism of nanotubular formation is hardly to be found. In
this paper, we provided organized and step by step discussion on
how NH4F, H2O and H2SO4 influence the growth of nanotubular
by performing the experiments with different concentration of
NH4F, H2O and H2SO4. The electrochemical formation of
nanotubular tantalum pentoxide (Ta2O5) was investigated in 50
ml ethylene glycol (EG), 0.5–3 wt% of NH4F, 0–6 vol% of H2O
and 0–1 vol% of H2SO4. Depending on electrolyte concentration,
Ta2O5 films exhibit different structural structures and features
after anodization. The results were shown through FESEM, real
images of samples and XRD analysis. By varying the
concentration, it was possible to change the structures of Ta2O5.
Finally, we demonstrated how electrochemical response during
anodization, thus forming nanotubular Ta2O5.