Fabrication of Stacked MoS(2) Bilayer with Weak Interlayer Coupling by Reduced Graphene Oxide Spacer

We fabricated the stacked bilayer molybdenum disulfide (MoS(2)) by using reduced graphene oxide (rGO) as a spacer for increasing the optoelectronic properties of MoS(2). The rGO can decrease the interlayer coupling between the stacked bilayer MoS(2) and retain the direct band gap property of MoS(2). We observed a twofold enhancement of the photoluminescence intensity of the stacked MoS(2) bilayer. In the Raman scattering, we observed that the E(1)(2g) and A(1g) modes of the stacked bilayer MoS(2) with rGO were further shifted compared to monolayer MoS(2), which is due to the van der Waals (vdW) interaction and the strain effect between the MoS(2) and rGO layers. The findings of this study will expand the applicability of monolayer MoS(2) for high-performance optoelectronic devices by enhancing the optical properties using a vdW spacer.