Electronic Properties of TiO₂ Nanoparticles Films and the Effect on Apatite-Forming Ability

Table 3

Peak potentials determined from CV, 𝐸_fb, and 𝑁_𝑑 determined from EIS.

Sample	^a𝐸𝑝/V	^bRel. active area (Aaa)	^c𝐸fb/V	^c𝑁𝑑×10^−19/cm^−3	^d𝑁𝑑×10^−19/Aaa
TS	−0.89	1	−0.35^d	84^d	84
TS + 8 nm	−1.16	2.65	−0.30	47	17.7
TS + 22 nm	−1.09	1.77	−0.30	47	26.6
TS + P25	−1.00	1.30	−0.35	50	38.5
TS + AT-I	−0.93	1.88	−0.41	119	63.3
Au + 22 nm	−1.27	—	−0.33	0.13	—

 ^a𝐸_𝑝 is determined in 0.1 M KOH. ^bCalculated on the exponential term for 𝐸 = 0 – (−1.5) V. ^c𝐸_fb and 𝑁_𝑑 are determined in 0.5 M H₂SO₄. ^dFrom [17], recalculating the value for 𝐸_fb to the pH is used in this study.