紫外发光增强的石墨烯-氧化锌纳米复合物

采用溶剂热法在相同条件下分别制备了纯ZnO和石墨烯-氧化锌纳米复合物，通过SEM、TEM、拉曼和红外光谱等手段，对纳米复合物样品进行了形貌和结构表征。实验结果显示ZnO纳米颗粒成功地分散在少层石墨烯上。通过对比纯ZnO与复合物的形貌和光致发光谱，发现在没有石墨烯时，ZnO能够择优取向生长成六方棱柱，紫外发光峰弱且宽；在有石墨烯时，ZnO聚集成表面不规则的球形颗粒，紫外发光峰强且窄。上述结果表明ZnO形貌的变化和石墨烯的等离子体效应共同影响了ZnO的紫外发光，但石墨烯的表面等离子体效应起主导作用。

Enhanced Ultraviolet Photoluminescence of Graphene-ZnO Nanocomposites

Graphene-ZnO nanocomposites and pure ZnO samples were prepared by solvothermal method under the same conditions. The morphology and structure of nanocomposites were characterized by SEM, TEM, Raman and infrared spectroscopy. The results show that ZnO nanoparticles have dispersed on a few layers graphene. Compared with the morphology of graphene-ZnO nanocomposites, it is found that pure ZnO can grow into a preferred orientation of hexagonal structure, while ZnO aggregates into sphere in the presence of graphene which is attributed to the graphene hindered the preferred orientation of ZnO growth. From the PL spectra, the ultraviolet emission peak intensity of graphene-ZnO is stronger than that of pure ZnO, and accompanied by blue shift phenomenon. The difference of ultraviolet photoluminescence between ZnO and graphene-ZnO comes from the difference of morphology and the plasma effect of grapheme, while the plasma effect of graphene plays a key role.