Fig. 4. Plasmonic photocatalysis for CO₂ reduction. (a) The cumulative production of CH₄ under 365 nm irradiation. (b) The cumulative production of CH₃OH under 450 nm irradiation. (c) Total DOS (black) and atom-projected DOS (PDOS) for Ag 5s (light blue), Ag 5d (grey), and Ti 3d (purple). (d) Temporal profiles of the transient absorption decay of Ag/TiO₂ and TiO₂ films after excitation at 355 nm. (e) A two-dimensional plot of the transient absorption spectrum of Ag/TiO₂ film after UV excitation. (f) A two-dimensional plot of the transient absorption spectrum of Ag/TiO₂ film excited with visible light. (a–f) Reproduced from ref. 67 with permission from Springer Nature, Copyright 2018.