van der Waals epitaxy of MoS₂ layers using graphene as growth templates.
We present a method for synthesizing MoS(2)/Graphene hybrid heterostructures with a growth template of graphene-covered Cu foil. Compared to other recent reports, (1, 2)  a much lower growth temperature of 400 °C is required for this procedure. The chemical vapor deposition of MoS(2) on the graphene surface gives rise to single crystalline hexagonal flakes with a typical lateral size ranging from several hundred nanometers to several micrometers. The precursor (ammonium thiomolybdate) together with solvent was transported to graphene surface by a carrier gas at room temperature, which was then followed by post annealing. At an elevated temperature, the precursor self-assembles to form MoS(2) flakes epitaxially on the graphene surface via thermal decomposition. With higher amount of precursor delivered onto the graphene surface, a continuous MoS(2) film on graphene can be obtained. This simple chemical vapor deposition method provides a unique approach for the synthesis of graphene heterostructures and surface functionalization of graphene. The synthesized two-dimensional MoS(2)/Graphene hybrids possess great potential toward the development of new optical and electronic devices as well as a wide variety of newly synthesizable compounds for catalysts.
Department of Electrical Engineering and Computer Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Yumeng
Y
Shi
Wu
W
Zhou
Ang-Yu
AY
Lu
Wenjing
W
Fang
Yi-Hsien
YH
Lee
Allen Long
AL
Hsu
Soo Min
SM
Kim
Ki Kang
KK
Kim
Hui Ying
HY
Yang
Lain-Jong
LJ
Li
Juan-Carlos
JC
Idrobo
Jing
J
Kong
D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D055672:Static Electricity; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties
D046911:Macromolecular Substances; D013455:Sulfur; D006108:Graphite; D008982:Molybdenum