▎ 摘　　要

Graphene oxide (GO)/Au nanoparticle (NP) hybrids were introduced into nanostructured sol-gel organically modified silica (ORMOSIL) using a sol gel technique. Scanning electron microscopy, Raman spectroscopy, thermogravimetric analysis, pore structure measurements, and UV-vis spectroscopy were performed to investigate the morphology, structure, texture, thermal stability and linear optical properties of the ORMOSIL gel glasses. The guest two-dimensional GO/Au NP hybrids maintained their own structures during the sol gel procedure, confirming that the sol-gel technique can effectively produce graphene-based solid-state bulky composites. Increasing doping level would result in the formation of a highly porous structure, better thermal stability, and lower linear transmittance. The nonlinear optical (NLO) properties of GO/metal NP-doped ORMOSIL gel glasses were investigated using a nanosecond open-aperture Z-scan technique at 532 nm. The nonlinear absorption coefficient of GO/Au NP-doped ORMOSIL gel glasses increases from 3.79 cm/GW to 8.79 cm/GW with increased doping level from 4.8 x 10(-3) to 19.2 x 10(-3). The result demonstrates that the NLO performance of the composite ORMOSIL gel glasses can be optimized by tuning the doping level of 2D GO/Au NP sheet in the matrices of the host gel glasses. The NLO behavior of GO/Au NP-doped ORMOSIL gel glasses were attributed to the combination of nonlinear absorption and nonlinear scattering. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.