Table 1.

Summary of the most representative fabrication conditions for NAA produced in the mild anodisation (MA) and or hard anodisation (HA) regimes and the geometric characteristics of the resulting nanostructures.

Acid electrolyte	Anodisation regime	V (V)	T (°C)	dp (nm)	dint (nm)	Growth rate (µm·h−1)	References
H2SO4 0.3 M	MA	25	5–8	25	63	7.5	[12]
H2SO4 0.3 M	HA	40	0–1	30	78	85	[18]
H2C2O4 0.3 M	MA	40	5–8	30	100	3.5	[11]
H2C2O4 0.3 M	HA	140	0–1	50	280	50	[4]
H3PO4 0.1 M	MA	195	0–1	160	500	2	[13]