量子点
拉曼光谱
石墨烯
材料科学
水热合成
X射线光电子能谱
石墨氮化碳
傅里叶变换红外光谱
氮化硼
氮化碳
碳纤维
纳米技术
分析化学(期刊)
化学工程
化学
热液循环
物理
光学
有机化学
复合数
复合材料
光催化
工程类
催化作用
作者
Siphesihle Robin Nxele,Tebello Nyokong
标识
DOI:10.1016/j.diamond.2021.108751
摘要
We report on the facile synthesis of graphene quantum dots (GQDs), nitrogen-doped quantum dots (NGQDs) and graphitic carbon nitride quantum dots (gCNQDs) by the bottom-up hydrothermal synthetic process. The time is varied to study its effects on the structural, hydrodynamic and optical properties of these nanostructures. The techniques used to characterize these nanostructures were transmission electron microscopy, X-ray diffractometry, dynamic light scattering, and zetametry (zeta potential), and by energy dispersive X-ray, UV/vis, fluorescence, Fourier transform infrared, Raman and X-ray photoelectron spectroscopies. For gCNQDs and NGQDs, Raman spectroscopy showed an increase in disorder with synthesis time, indicating introduction of more triazine groups for the former and increase in doping with the N atoms for the latter, hence higher temperatures are recommended. For GQDs, Raman spectra showed an increase in the spatial order of the π-conjugated structure with synthesis time. Considering all the techniques employed in this work, the synthesis times of 6h and 8 h are recommended for GQDs and NGQDs.
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