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Graphene-based heterostructure is one of the most attractive topics in physics and material sciences due to its intriguing properties and applications. We report the one-step fabrication of a novel graphene/Mo 2 C heterostructure by using chemical vapor deposition (CVD). The composition and structure of the heterostructure are characterized through energydispersive spectrometer, transmission electron microscope, and Raman spectrum. The growth rule analysis of the results shows the flow rate of methane is a main factor in preparing the graphene/Mo 2 C heterostructure. A schematic diagram of the growth process is also established. Transport measurements are performed to study the superconductivity of the heterostructure which has potential applications in superconducting devices.

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This study reports the growth of aligned monolayer molybdenum disulfide (MoS 2) ribbons on a sapphire substrate via NaOH-assisted chemical vapor deposition. The length of MoS 2 ribbon is up to 400 μm. The MoS 2 ribbon has excellent single crystal properties, a carrier mobility of1 50 cm 2 V −1 s −1 , and a optical response of 103 mA W −1 at a wavelength of 550 nm. The growth model of MoS 2 ribbons was given. NaOH reacts with MoO 3 to form sodium molybdate droplets, which increase the fluidity of the molybdenum source on the substrate, realizing the vapor-liquid-solid growth of MoS 2 on sapphire. The monolayer MoS 2 ribbons have two kinds of arrangements on the sapphire substrate, one is the oriented growth affected by the interlayer van der Waals force and the lattice, and the other is the aligned growth constrained by the sapphire step. Our results promote the basic research and device applications of MoS 2 , and introduce a new way of synthesizing other one dimensional (1D) and 2D nanostructures.