Effects of interface interaction on the Mie resonance absorption of gold nanoparticles dispersed within pores of mesoporous silica

Mesoporous silica with Au nanoparticles loaded within its pores were prepared by in situ sonochemical reduction of chloroauric acid (HAuCl4). The optical absorption has been investigated for the Au nanoparticles dispersed within pores of monolithic mesoporous silica after subsequent annealing treatment. Charge transfer at the interfaces between Au nanoparticles and pore walls is introduced qualitatively to discuss the red-shift of Mie resonance absorption band with decreasing the Au particle size. # 2001 Elsevier Science B.V. All rights reserved.