In this study, the MoS2 nanoparticles grown on crumpled 3D graphene microball (3D GM–MoS2) was synthesized using a microfluidic droplet generator with thermal evaporation-driven capillary compression and hydrothermal reaction. The morphology and size of 3D GM–MoS2 are controlled by the concentration of nano-sized graphene oxide (GO) and the flow rate of oil phase on the droplet generator. The 3D GM–MoS2 with fully sphere-shape and uniform size (~ 5 μm), and homogeneous growth of MoS2 nanoparticles could be synthesized at the flow rate of the oil phase of 60 μL/min with the optimized GO concentration of 1.0 mg/mL, and ( NH4)2MoS4 concentration of 2.0 mg/mL.

    Abstract
    1 Introduction
    2 Materials and methods
        2.1 Materials
        2.2 Synthesis of MoS2 nanoparticles grown on 3D graphene microball (3D GM–MoS2)
    3 Results and discussion
        3.1 Synthesis of 3D GM–MoS2 by controlling GO concentration and oil flow rate
    4 Conclusions
    Acknowledgements 
    References

• Minsu Park(Querrey Simpson Institute for Biotechnology (QSIB), Northwestern University)
• Sanha Kim(Department of Pharmaceutical Engineering, Dankook University)
• Jae Hwan Jung(Department of Pharmaceutical Engineering, Dankook University)
• Tae Seok Seo(Department of Chemical Engineering (BK21 FOUR Integrated Engineering Program), Kyung Hee University)