Graphene quantum dots, graphene oxide, carbon quantum dots and graphite nanocrystals in coals
Graphene quantum dots, graphene oxide, carbon quantum dots and graphite nanocrystals in coals
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煤中石墨烯量子点、氧化石墨烯、碳量子点和石墨纳米晶
DOI：
10.1039/c4nr01482k
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发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Chen, Guonan
中科院分区：
文献类型：
--
作者：
Dong, Yongqiang;Lin, Jianpeng;Chen, Guonan
采用六种不同煤阶的煤样制备了单层石墨烯量子点。每种煤经过化学氧化和一系列离心分离后，可以被处理成两个馏分，即煤（A）和煤（B）。根据TEM、AFM、XRD、拉曼和FTIR的表征结果，煤（A）主要由S-GQD组成，其平均高度约为0.5 nm，平均平面尺寸约为10 nm。所得S-GQD具有激发依赖性荧光和优异的电化学发光。煤（B）被发现是一些其他的碳基纳米材料（CNMs），包括团聚的GQD，氧化石墨烯，碳量子点和团聚的碳纳米晶体。一般来说，低煤阶煤可能更适合制备S-GQD。随着煤阶的增加，6种煤的S-GQD产率从56.30%下降到14.66%。相比之下，高等级煤具有煤（B）的高产率，并且可能更适合于制备煤（B）中所含的其他CNM，尽管这些CNM在我们的实验中难以彼此分离。
Six coal samples of different ranks have been used to prepare single-layer graphene quantum dots (S-GQDs). After chemical oxidation and a series of centrifugation separation, every coal could be treated into two fractions, namely, Coal(A) and Coal(B). According to the characterization results of TEM, AFM, XRD, Raman and FTIR, Coal(A) was revealed to be mainly composed of S-GQDs, which have an average height of about 0.5 nm and an average plane dimension of about 10 nm. The obtained S-GQDs showed excitation-dependent fluorescence and excellent electrochemiluminescence. Coal(B) was found to be some other carbon-based nanomaterials (CNMs), including agglomerated GQDs, graphene oxide, carbon quantum dots and agglomerated carbon nanocrystals. Generally, low-ranked coals might be more suitable for the preparation of S-GQDs. The production yield of S-GQDs from the six investigated coals decreased from 56.30% to 14.66% when the coal rank increased gradually. In contrast, high-ranked coals had high production yield of Coal(B) and might be more suitable for preparing other CNMs that were contained in Coal(B), although those CNMs were difficult to separate from each other in our experiment.