One-Step Cohydrothermal Synthesis of Nitrogen-Doped Titanium Oxide Nanotubes with Enhanced Visible Light Photocatalytic Activity

Table 2

XPS of TC-series.

Sample	Nitrogen content; (%)^a	N 1s; (eV)	O 1s; (eV)	Ti 2p3/2; (eV)
TC-0	0.50	398.0	528.0	457.0
TC-1	2.69	400.6	530.3	458.8
TC-1(400)	2.46	399.9	531.1	459.8

^aNitrogen doping percentage calculated according to the curve fitting of the XPS micrographs for the N 1s region.