Table 2 Fractal and statistical descriptors of the TNAs structures derived from AFM images: D – fractal dimension, τ – corner frequency, Str – anisotropy ratio, Sq – surface roughness.

From: Evolution of rough-surface geometry and crystalline structures of aligned TiO2 nanotubes for photoelectrochemical water splitting

Sample

D1

D2

τ1 [nm]

τ2 [nm]

Str

Sq [nm]

#1

2.37

—

48

—

0.94

4.0

#2

2.38

—

42

—

0.94

5.5

#3

2.44

—

45

—

0.95

15

#4

2.43

—

46

—

0.90

11

#5

2.41

2.81

35

600

0.26

4.7

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