Graphene/surfactant-assisted synthesis of edge-terminated molybdenum disulfide with enlarged interlayer spacing

The paper presents a facile and effective method to fabricate the new type MoS2 with expanded interlayer spacing (similar to 9.70 angstrom) and high-density edges in the presence of graphene oxide (GO) and surfactant. The abundant oxygen-containing groups on GO surfaces can provide nucleation sites through electrostatic interaction with the assistance of surfactant to promote heterogeneous nucleation of MoS2 on GO surfaces. During reaction, GO was reduced to graphene (rGO) by eliminating the oxygen-containing groups. The nonwettability between MoS2 and rGO compels the growing MoS2 nanosheets to stretch out of the rGO surfaces, leading to the high-density edges. Besides, the excess surfactant can insert the interlayer of MoS2, causing the enlarged interlayer spacing. The obtained MoS2 could exhibit improved catalytic activity and the synthetic approach presented here may be extended to grow other transition metal dichalcogenide materials. (C) 2017 Elsevier B.V. All rights reserved.