Differentiating the impact of nitrogen chemical states on optical properties of nitrogen-doped graphene quantum dots

Timothy Pillar-Little, Doo Young Kim

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The optical properties of top-down synthesized oxidized graphene quantum dots (ox-GQDs) and nitrogen-incorporating graphene quantum dots (N-GQDs) along a range of hydrothermal treatment temperatures were observed. By controlling the hydrothermal treatment temperature, different chemical states of nitrogen atoms were incorporated into GQDs. Below 150 °C, edge-terminating amines and amides dominated the nitrogen content of N-GQDs. Above 150 °C, nitrogen was primarily present in the forms of pyridinic, pyrrolic and quaternary N. In addition to the absorbance and emission profiles of ox-GQDs and N-GQDs, pH-dependent emission spectra were collected to probe chemical states of nitrogen atoms and investigate the relationship between nitrogen location and photoluminescence.

Original languageEnglish
Pages (from-to)48263-48267
Number of pages5
JournalRSC Advances
Volume7
Issue number76
DOIs
StatePublished - 2017

Bibliographical note

Funding Information:
The authors thank Prof. Ambrose Seo and John Connell for AFM characterization. The authors appreciate Dali Qian for TEM characterizations. This work was supported by the National Science Foundation under Cooperative Agreement No. 1355438. The purchase of a new XPS system recently installed at the University of Kentucky was supported by the fund from the NSF EPSCoR grant (grant no. 0814194).

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)

Fingerprint

Dive into the research topics of 'Differentiating the impact of nitrogen chemical states on optical properties of nitrogen-doped graphene quantum dots'. Together they form a unique fingerprint.

Cite this