ZnO@GQDs核壳结构量子点的制备及性能研究

采用原位聚合法制备了以ZnO量子点为核、石墨烯量子点（GQDs）为壳的ZnO@ GQDs核壳结构量子点。通过TEM和HR-TEM对量子点进行形貌和结构的分析表征。结果表明，合成的ZnO@ GQDs核壳结构量子点为球形，粒径为～7 nm，且尺寸均匀。PL光谱研究表明，新型量子点的发射峰位于369 nm，发光峰窄、强度高;相对于ZnO的本征发射峰，GQDs的引入使得ZnO@GQDs核壳量子点的荧光发射峰出现蓝移、强度变高，从而使复合量子点的荧光具有较纯的色度和较高的强度，说明GQDs的引入具有协同优化效应。该量子点有望应用于LED显示器件。

Synthesis and Characterization of ZnO@Graphene Quantum Dots with Core-shell Structure

Graphene quantum dots (GQDs) were prepared by hydrothermal approach. ZnO@ Graphene quantum dots(ZnO@ GQDs) core/shell quantum dots were synthesized by in-situ polymerization. The morphology, structure and the optical properties of the samples were characterized by TEM, HR-TEM, XRD, UV-Vis and PL, respectively. The results show that ZnO@ GQDs core/shell quantum dots are spherical and good dispersible with a uniform particle size of ～7 nm. The GQDs shell was coated on the surface of ZnO QDs and formed the ZnO@ GQDs core/shell structure QDs. The blue shift and higher intensity of core/shell QDs compared with the pure ZnO QDs were observed in PL spectra, which suggested the introduction of the GQDs induced a synergistic luminescence effect. This novel material may be a potential candidate for LED display device.