Preparation of Improved p-n Junction NiO/TiO₂ Nanotubes for Solar-Energy-Driven Light Photocatalysis

Table 2

Lattice parameters for TNTs and NiO/TNTs samples with different concentrations.

Sample	Crystallite size (nm)^a	Cell parameters; 𝑎=𝑏,𝑐 (Å)^b
TNTs	33.81	3.7868, 9.5102
NiO/TNTs (0.5 M)	34.54	3.7828, 9.5184
NiO/TNTs (2.5 M)	34.10	3.7872, 9.5438

^aMeasured by Scherrer’s equation.
^bEstimated according to (2) and (3).