Journal
DIAMOND AND RELATED MATERIALS
Volume 114, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108342
Keywords
Fluorinated reduced graphene oxide; Vacancies; Bandgap; Photoluminescence
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Funding
- State Key Program for Basic Research [2017YFA0206304]
- National Natural Science Foundation of China [51572122]
- High Performance Computing Center of Nanjing University
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Fluorinated reduced graphene oxide (F-rGO) was prepared by annealing rGO and XeF2, showing a tunable bandgap from 0.42 to 3.0 eV with increasing fluorine concentrations. The presence of CF2 modified vacancies on the basal plane leads to band-tail absorption and broader PL emission peak in F-rGO. The study provides new insights into bandgap opening and PL emission in F-rGO.
Fluorinated graphene has been widely studied and its nonstoichiometric structure is considered as defective. However, the impact of structural defects on optical properties was generally neglected. Here, fluorinated reduced graphene oxide (F-rGO) was prepared by annealing rGO and XeF2, and its structure, bandgap and optical properties are investigated. The results show that there are plenty of vacancies modified by CF2 on the basal plane of F-rGO sheets. With the increasing of the fluorine concentrations from 0.29 to 0.98 at.%, F-rGO exhibits broad tunable gap from 0.42 to 3.0 eV. Interestingly, it shows obviously band-tail absorption and broader PL emission peak due to the fluorinated vacancies. Theoretical calculations show that CF2 group on C mono-vacancy can increase the bandgap. This study provides a new insight into the bandgap opening and PL emission in F-rGO.
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