Graphene/MoS2 organic glasses: Fabrication and enhanced reverse saturable absorption properties

Graphene/MoS2 (G/MoS2) composites were synthesized for the first time by a hydrothermal method, and then were dispersed in methyl methacrylate (MMA) to fabricate organic glass by a casting method. Here, the poly(methylmethacrylate) (PMMA) host can be obtained by the polymerization of MMA. The nonlinear absorption (NLA) properties of the G/MoS2/PMMA organic glasses were investigated by using an open-aperture Z-scan technique. The experimental results showed that the G/MoS2/PMMA organic glasses (the NLA coefficient beta, was up to 2110 cm/GW) exhibited enhanced reverse saturable absorption (RSA) properties compared to G/PMMA (beta = 242 cm/GW) and MoS2/PMMA (beta = 365 cm/GW) organic glasses. The enhanced mechanism of RSA was analyzed in terms of the energy-level diagram of graphene and MoS2. The G/MoS2/PMMA organic glasses have very promising applications in optical devices such as optical limiters and optical shutters. (C) 2013 Elsevier B.V. All rights reserved.