Review of the Synthetic Techniques and Applications of the Quantum Dots/Graphene Composites

Abstract

The Quantum Dots/Graphene (QDs/GR) composites have attracted numerous interests caused by its unique physical and chemical properties in past few decades. The shortages of the single QD and graphene materials could be remedied by the synergistic effects from QDs/GR composite materials; meanwhile, some unique phenomena and superior physical properties were also produced. The QDs/GR composites processed better photocatalytic activities, higher photon capture abilities and excellent optical responsibilities. Therefore, they were widely applied in various techniques. Here, we reviewed and discussed recent research progresses about the QDs/GR composites and focused on their industrial preparation and commercial applications. Among these synthetic methods, ion beam sputtering deposition (IBSD) and molecular beam epitaxy (MBE) were discussed in detail because they could be directly applied in commercial industry for preparing size-tunable quantum dots. In another part, the applications of the QDs/GR composites were also discussed, the advanced physical and chemical properties promoted these composites to have numerous potential for being applied in photodetectors, lithium ion batteries, solar cells, supercapacitors and other devices. The appropriate synthetic method for QDs/GR materials is highly dependent on the requirements of its applications. We firmly believe that the direct synthesis technique of ideal QDs/GR composite for specific applications is a challenge and research emphasis for scientist and engineers in future.

Effect of defects on optical and electronic properties of graphene quantum dots: a density functional theory study

“…11 These properties make GQDs highly promising for various applications, including sensors, biomedical science, photocatalysis, and energy storage. [12][13][14][15][16] However, during the preparation process of GQDs, the presence of defects is inevitable and can affect their morphology, structure, and properties. [16][17][18][19][20][21][22] Defects in GQDs can arise from various sources, such as vacancies and topological defects in the top-down process of cutting graphene, or from foreign atom doping in the bottom-up approach using small molecule precursors.…”