Figure 4

Photodegradation of MB and amplitude enhancement of electric field. (a) The photodegradation of MB solution by S1 to S4 and reference sample TiO₂ under UV light irradiation (inset) and the corresponding plots of $\mathrm{In}\left(\frac{A_0}{A}\right)$ versus the irradiation time, showing the linear fitting results. (b) Amplitude enhancement of the electric field inside a TiO₂ layer is simulated by the FDTD method.