Figure 2.

(A) SEM of the self-organized TiO₂ NTs, the inset: high-magnification SEM image (B) SEM of the 3D interlaced network of BiOI layer on TiO₂ NTs, the inset: high-magnification SEM image, (C) XPS spectrum of the hybrid, the inset: XRD pattern of the developed TiO₂ NTs (a) and BiOI/TiO₂ hybrid (b), (D) Transient photocurrent response of the samples, the bare Ti foil (a), the TiO₂ NTs (b, d) and BiOI/TiO₂ hybrid (c, e) in 0.10 M tris-HCl (pH 7.8) without (b, c) and with (d, e) 1.0 × 10⁻³ M NADH, the inset: the effect of SILAR cycles of BiOI on the resulting hybrids. All photocurrent responses were recorded with 0 V working potential and 470 nm light wavelength on and off.