期刊
SURFACE SCIENCE
卷 676, 期 -, 页码 51-55出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2018.01.013
关键词
Carbogenic quantum dots; Nitrogen-doped graphene quantum dots; Band gap; Valence and conduction bands; Band structures; Synchrotron spectroscopy
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [DG RGPIN-2013-201697, SPG STPGP-2016-493924]
- Canada Foundation for Innovation/Ontario Innovation Trust (CFI/OIT) [9040]
- Premier's Research Excellence Award (PREA)
- University of Western Ontario
This paper is dedicated to Professor P.R. Norton on the occasion of his 75th birthday, in honor of his profound contributions to Surface Science. Graphene quantum dots (GQDs) attracted great interests attributed to their outstanding photoluminescence properties. Nitrogen doping is an effective strategy to engineer the optical and electron transfer properties of GQDs. Nitrogen doped GQDs (N-GQDs) were obtained by using cow milk as the precursor via a facile hydrothermal process with a Teflon-lined autoclave heated at 200 degrees C for 4.5 h. The purified N-GQDs were discovered to have high crystallinity with a lattice spacing of 0.21 nm corresponding to that of in-plane graphene (100 facet). The optical band gap of the N-GQDs was estimated from the Tauc plot derived from their UV-vis absorption spectrum. The full valence band spectrum of N-GQDs was collected and analyzed by means of synchrotron-based X-ray photoelectron spectroscopy for the first time. Corresponding full band structures were elucidated. (C) 2018 Elsevier B.V. All rights reserved.
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