3 years ago

Tuning the photoluminescence of graphene quantum dots by co-doping of nitrogen and sulfur

Tao Tang, Jianfeng Wen, Yongjie Xu, Xinyu Li, Ming Li, Guanghui Hu, Lang Sun, Yi Luo

Abstract

Nitrogen and sulfur co-doped graphene quantum dots (NS-GQDs) were successfully synthesized using a facile, inexpensive, and environmentally friendly hydrothermal reaction of aqueous ammonia, S powder, and graphene quantum dots. The NS-GQDs with oxygen-rich functional groups have a high quantum yield of 41% and a diameter of 1–5 nm. The photoluminescence (PL) properties of the nitrogen-doped graphene quantum dots (N-GQDs) and NS-GQD were investigated. The results showed that the PL emission of the NS-GQD exhibits a clear blue shift of 54 nm compared to that of the N-GQDs.

Publisher URL: https://link.springer.com/article/10.1007/s11051-017-4059-4

DOI: 10.1007/s11051-017-4059-4

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