单颗半导体纳米晶与石墨烯之间的能量传递
Energy Transfer from Individual Semiconductor Nanocrystals to Graphene
摘要：
从光激发零维系统到金属系统的能量转移在现代材料科学中起着重要作用。一种特别有趣的情况是光激发偶极子和原子级薄金属之间的相互作用。最近发现的石墨烯层允许调查这种现象。在这里，我们报告的荧光从个别的CdSe/ZnS纳米晶体接触单层和几层石墨烯片的研究。能量转移的速率由荧光的强烈猝灭决定。对于单层石墨烯，我们发现的速率为~ 4 ns-1，与基于偶极近似和石墨烯紧束缚描述的模型一致。在接近体积极限之前，该速率随着石墨烯层的数量显著增加。我们的研究量化了石墨烯的能量转移和荧光猝灭，这是光伏器件中新应用的关键特性，也是分子标尺。
英文摘要：
Energy transfer from photoexcited zero-dimensional systems to metallic systems plays a prominent role in modern day materials science. A situation of particular interest concerns the interaction between a photoexcited dipole and an atomically thin metal. The recent discovery of graphene layers permits investigation of this phenomenon. Here we report a study of fluorescence from individual CdSe/ZnS nanocrystals in contact with single- and few-layer graphene sheets. The rate of energy transfer is determined from the strong quenching of the nanocrystal fluorescence. For single-layer graphene, we find a rate of ~ 4ns-1, in agreement with a model based on the dipole approximation and a tight-binding description of graphene. This rate increases significantly with the number of graphene layers, before approaching the bulk limit. Our study quantifies energy transfer to and fluorescence quenching by graphene, critical properties for novel applications in photovoltaic devices and as a molecular ruler.
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