Energy-level structure of nitrogen-doped graphene quantum dots

Libin Tang, Rongbin Ji, Xueming Li, Kar Seng Teng, Shu Ping Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

279 Citations (Scopus)


The doping of carbon-based materials is of great importance due to its ability to modulate their optical, electrical and optoelectronic properties. Nitrogen-doped graphene quantum dots (N-GQDs) have received significant attention due to their superior electrocatalytic activity, optical properties and biocompatibility. The energy-level structure of N-GQDs remains unknown, which hinders the development of N-GQDs for various applications. Here, we report a one-pot synthesis method to prepare large-quantity N-GQDs at room temperature and atmospheric pressure under a prolonged reaction time. Using this approach, we can effectively dope N into the N-GQDs. As revealed by electron energy loss spectroscopy, N-doping introduces a new energy level into the electronic structure, which is responsible for tuning the optical properties of the N-GQDs.
Original languageEnglish
Pages (from-to)4908-4915
Number of pages8
JournalJournal of Materials Chemistry C
Issue number32
Publication statusPublished - 4 Sept 2013

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry


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