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论文类型： 期刊论文

发表时间： 2021-07-21

发表刊物： DIAMOND AND RELATED MATERIALS

卷号： 87

页面范围： 233-241

ISSN号： 0925-9635

关键字： Graphene quantum dots; Gaseous detonation; Formation mechanism; Photoluminescence mechanism

摘要： Graphene quantum dots (GQDs) in high reproducibility are synthesized by a gaseous detonation method which converts untreated benzoic acid (BA) precursor into powdered GODs without complicated post-treatment in 3-5 ms. The as-prepared GQDs resulting in an absolute photoluminescence quantum yield (PLQY) of 21.5% exhibit dual-wavelength-independent emission with the maximum PL emission at 431 nm and 460 rim under excitation maximum at 300 nm dispersed in ethyl alcohol. Based on surface structure, photoluminescence (PL) behaviors of GQDs and the characteristics of gaseous detonation, the formation mechanism of GQDs is speculated. Moreover, further study regarding the optical properties of reducing GQDs (R-GQDs) and thermal annealing GQDs (A-GQDs), it is possible to reveal PL mechanism of GQDs. This research not only provides a onepot solvent-free route to rapid and large-scale preparation of GQDs, but also accounts for the hypothetic formation and PL mechanism of the obtained GQDs.