Figure 7
Au L3-edge XANES spectra of gold nanoparticles on mesoporous materials [as-prepared: (a) as prepared Au MCM-41 (a); (b) Au MCM-41 (a) (heat treated at 823 K, 3 h); (c) Au MCM-41 (a) (heat treated at 1113 K, 3 h); (d) Au MCM-41 (a) (heat treated at 1273 K, 3 h)]. |