Figure 4

Evolution of morphology and microstructure of CdS deposition in TiO ₂ NTAs under AC conditions. (a-f) SEM images (top view) of CdS-coated TiO₂ NTAs (insets are corresponding TEM images) with different bias magnitudes: (a) |U| = 2.5 V, (b) |U| = 5.0 V, (c) |U| = 6.0 V, (d) |U| = 7.0 V, (e) |U| = 9.0 V, and (f) |U| = 10.0 V. (g) XRD patterns, with curves (a’-f’) for corresponding samples, concentration of Na₂S was 0.001 M. Detailed conditions of deposition can be found in Table 1.