Figure 1: Electron microscopy of substrate and particles.

(a) AuNPs on TiO2 (b,c) AuNPs, (d,e) AgNPs. Scale bars given are 500 nm (a), 100 nm (b,d) and 10 nm (c,e).
(a) AuNPs on TiO2 (b,c) AuNPs, (d,e) AgNPs. Scale bars given are 500 nm (a), 100 nm (b,d) and 10 nm (c,e).