氮功能化石墨烯纳米片（GNF：N）：可调谐光致发光和电子结构
Nitrogen-Functionalized Graphene Nanoflakes (GNFs:N): Tunable Photoluminescence and Electronic Structures
摘要：
研究了氮功能化的二维石墨烯纳米片（GNF：N）中观察到的强光致发光（PL）和X射线激发的光学发光，这是由于π态区域的态密度显著增强以及π和π* 态之间的间隙引起的。类吡啶N-C、类石墨N和C=O键的sp2团簇数目的增加以及N和O原子向sp2团簇的共振能量转移是导致蓝移和主要PL发射特征增强的原因。通过X射线吸收近边结构、X射线发射光谱和共振非弹性X射线散射研究发现，荧光增强与电子结构和成键性质的变化密切相关。该研究表明，可以通过适当调节GNF中的氮和氧含量来定制PL发射，并为新型光电子器件铺平道路。
英文摘要：
This study investigates the strong photoluminescence (PL) and X-ray excited optical luminescence observed in nitrogen-functionalized 2D graphene nanoflakes (GNFs:N), which arise from the significantly enhanced density of states in the region of π states and the gap between π and π* states. The increase in the number of the sp2 clusters in the form of pyridine-like N-C, graphite-N-like, and the C=O bonding and the resonant energy transfer from the N and O atoms to the sp2 clusters were found to be responsible for the blue shift and the enhancement of the main PL emission feature. The enhanced PL is strongly related to the induced changes of the electronic structures and bonding properties, which were revealed by the X-ray absorption near-edge structure, X-ray emission spectroscopy, and resonance inelastic X-ray scattering. The study demonstrates that PL emission can be tailored through appropriate tuning of the nitrogen and oxygen contents in GNFs and pave the way for new optoelectronic devices.
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