Nanoscale materials have promoted the advancement of science and technology due to their intrinsic size-, morphology-, phase-and structure-dependent properties and resulting applications.New methodologies for the controlled and reproducible synthesis of nanoparticles at desired scale and low cost have become one of the principal challenges in nanoscale science and technology.Microfluidic reactors (MFRs) are effective tools for nanoparticles (NPs) synthesis owing to their in-situ spatial and temporal reaction kinetics control, easy parallel scale up, and reproducibility.