量子点
石墨烯
氧化剂
材料科学
量子产额
石墨
荧光
纳米技术
生物相容性
纳米晶
产量(工程)
蚀刻(微加工)
热液循环
剥脱关节
化学工程
化学
复合材料
有机化学
冶金
工程类
物理
量子力学
图层(电子)
作者
Yiqing Sun,Shiqi Wang,Chun Li,Peihui Luo,Lei Tao,Yen Wei,Gaoquan Shi
摘要
We report an improved Hummers method for synthesizing graphene quantum dots (GQDs) by directly oxidizing and etching graphite powders. The yield of GQDs is as high as 63 ± 7% (by weight, wt%), suggesting this technique is suitable for producing GQDs on a large scale. The GQDs are nanocrystals with lateral dimensions in the range of 2-4 nm and an average thickness of around 1.3 nm. The emission peaks of as-prepared GQDs can be tuned in the range of 440 to 510 nm by varying the reaction conditions. Their fluorescence quantum yields were tested to be around 1%, which could be further increased to about 3% by hydrothermal treatment. These GQDs have low cytotoxicity and excellent biocompatibility, indicating that they are promising for biological applications.
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