(243-255)Control of selective silicate glass coloration by gold metallicnanoparticles: structural investigation, growth mechanisms,and plasmon resonance modelization

摘要

Soda lime silicate oxide glasses are studied to performcoloration thanks to gold nanoparticles’ crystallization.This precipitation is conducted by chemical reduction of goldions with stannous or antimony oxides as reducing agents. Acontrol of the rendered coloration between blank to red shadeshas been obtained using Sb2O3 agent and appropriate thermaltreatments. The glasses remain colorless while heating up to450 °C. Structural glasses evolution is studied by MAS NMRspectroscopy of 29Si and 23Na nuclei to investigate the silicatenetwork polymerization change and the modification ofsodium/oxygen bond length versus nucleation state andgrowth of Au nanoparticles. A clear decrease of the Q2 speciespart is observed with nanoparticles growth confirmed by theevolution of chemical shift for 23Na resonance. A slight networkpolymerization is then showed independently of theonly thermal treatment. This structural change could be inducedby the antimony oxidation and change towards highercoordinations. Finally, the glasses chemical durability hasbeen studied by leaching tests and shows lower alteration forcolored glass. The optical spectroscopy applied to coloredglasses has given rise to plasmon resonance phenomena ataround 600 nm which is the typical surface plasmon resonanceof gold for a refractivemediumindex of 1.5, with a shiftof the resonance towards the higher wavelengths with increasingthermal treatment temperature. This shift is modelized byDrude and MIE approaches and confirms the trend observedby UV-visible measurement with an increasing absorption atthe SPR correlated to a typical Ostwald growth mechanismaccording to the increase of the annealing temperature.