Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization
Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization
复制标题
煤基石墨烯与煤基石墨烯量子点共生微观结构研究：制备与表征
DOI：
10.1088/1361-6528/ac842e
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发表时间：
2022-08
期刊：
影响因子：
3.5
通讯作者：
Xingjun Mao
中科院分区：
文献类型：
--
作者：
Ruiqing Li;Yuegang Tang;Qili Che;Xuan Huan;Pengliang Ma;Peng Luo;Xingjun Mao
煤基石墨烯片（GS）和煤基石墨烯量子点（GQD）通常分别制备。本文以三种不同反射率的原煤（采自山西省沁水煤田）为碳源，采用我们提出的制备方法成功制备了煤基GS和煤基GQDs的共生体。结果表明，煤基GS和煤基GQD能够稳定共生并分布在不同层位，而GQD则自由分布在GS各层之间。三种共生体中GS（Nave）的平均数量约为7，平均层间距（d002）约为0.3887 nm。三种共生体中GQD的平均直径约为4.255 nm，平均直径约为0.230 nm。三种共生体的平均Nave约为3，平均002约为0.361 nm。共生体的形貌和晶体参数与石墨烯更加相似，元素只有碳和氧。所制备的共生体中，原煤的反射率越高，GS的晶格骨架越光滑，涡层结构越少，GQD的直径越大，六元环越致密。所制备的共生体的C和O官能团是相似的。煤的反射率越高，C-C/C=C的含量越高。在紫外光照射下，制备的产物均发出蓝色光，且煤的反射率越高，紫外吸收越高，荧光强度越强。
Coal-based graphene sheets (GS) and coal-based graphene quantum dots (GQDs) are usually prepared separately. In this paper, symbiosis of coal-based GS and coal-based GQDs was successfully prepared with our proposed preparation method by using three raw coals with different reflectance (collected from Qinshui coalfield, Shanxi Province) as carbon sources. The results showed that coal-based GS and coal-based GQDs can exist stably in the symbiosis and are distributed in different layers, and the GQDs are freely distributed between layers of GS. The average number of GS (Nave) in the three symbiosis is about 7 and the average interlayer spacing (d002) is about 0.3887 nm. The average diameter of GQDs in the three symbiosis is about 4.255 nm and the averaged002is about 0.230 nm. The averageNaveof the three symbiosis was about 3 and the averaged002is about 0.361 nm. The morphology and crystal parameters of symbiosis is more similar to that of graphene, the elements are only carbon and oxygen. In the prepared symbiosis, the higher the reflectance of raw coal, the smoother the lattice skeleton and the less vortex-layer structure of GS, and the larger the diameter and the denser the six membered ring of GQDs. The C and O functional groups of the prepared symbionts are similar. The higher the reflectance of coal, the higher the content of C-C/C=C. Under ultraviolet light, the prepared products all emit blue, and the higher the reflectance of coal, the higher the ultraviolet absorption, and the stronger the fluorescence intensity.
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