Feng Qian, Xiao Wenqing, Liu Yuan, Zheng Yongping, Lin Yuda, Li Jiaxin, Ye Qingying, Huang Zhigao
Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China.
Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen 361005, China.
Materials (Basel). 2018 Jan 8;11(1):91. doi: 10.3390/ma11010091.
A novel approach has been developed to synthesize slightly fluorinated graphene quantum dots (GQDs-F) through thermal cutting of highly fluorinated graphene. The fluorinated graphene with substantial structure defects is fragile and is readily attacked. The direct evaporation of abundant CF ( = 2, 3) groups near structure defects lead to the loss of adjacent skelton C atoms, and the fluorinated graphene can be thermally cut into GQDs-F with a relatively uniform nanosize in pyrolysis at 810 K. The GQDs-F with a low F/C atomic ratio of ca. 0.03 exhibit excitation wavelength-dependent properties with multicolor photoluminescence (PL) from blue to green. At the same time, F adatoms that are most likely located at the edges of GQDs-F have a high efficiency of introducing paramagnetic centres, and GQDs-F show a strong paramagnetism because of sp³-type defects and magnetic zigzag edges. The graphene quantum dots with such multimodal capabilities should have great applied value in material science.
一种通过对高度氟化的石墨烯进行热切割来合成轻度氟化石墨烯量子点（GQDs-F）的新方法已经被开发出来。具有大量结构缺陷的氟化石墨烯很脆弱，容易受到攻击。结构缺陷附近大量CF（=2,3）基团的直接蒸发导致相邻骨架C原子的损失，并且在810 K的热解过程中，氟化石墨烯可以被热切割成具有相对均匀纳米尺寸的GQDs-F。具有约0.03的低F/C原子比的GQDs-F表现出激发波长依赖性特性，具有从蓝色到绿色的多色光致发光（PL）。同时，最有可能位于GQDs-F边缘的F吸附原子具有高效率地引入顺磁中心的能力，并且由于sp³型缺陷和磁性锯齿边缘，GQDs-F表现出强顺磁性。具有这种多模态能力的石墨烯量子点在材料科学中应该具有很大的应用价值。
