Table 2.

Nitrogen content, specific surface area (S_BET), band-gap energy values, and color of TiO₂ nanoribbons derived from hydrogen titanate nanoribbons under different transformation conditions.

sample	N contenta (wt %)	SBET (m2·g−1)	band gap (eV)	color
TO-400	—	31	3.50	white
TO-580	—	23	3.50	white
TO-650	—	21	3.30	white
TN-400	0.8	31	3.44	pale yellow
TN-580	1.3	32	3.15	yellowish green
TN-650	2.5	32	3.10	grey
CH-W	—	64	3.49	white
CH-N	0.6	45	3.51	white
MW-W	—	61	3.52	white
MW-W+TO	—	57	3.50	white
CH-W+TN	0.3	53	3.52	white

^aN content was calculated from XPS spectra.