| 초록 |
ZnO nanostructures have been explored extensively in photovoltaic and photocatalytic applications owing to their physical and chemical stability, low cost, and simple synthesis process. The major bottleneck of using pristine ZnO is its poor photoabsorption in the visible region. An alternative to toxic chalcogenide semiconductor sensitization, carbon quantum dots (CQDs) and graphene quantum dots (GQDs) have been studied as sensitizers of ZnO nanostructures for photocatalytic applications. GQDs are environmentally friendly, nontoxic, and can be synthesized using low cost chemical processes. In this work, we have synthesized nitrogen-doped graphene quantum dots (N-GQDs) using a hydrothermal process. The microstructural and optical properties of these N-GQDs sensitized ZnO nanoparticles (NPs) were investigated. The roles of the N-GQDs on ZnO NPs for achieving higher photoconversion efficiency (IPCE) were demonstrated. |
