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Title: Optical properties of fluorescent zigzag graphene quantum dots derived from multi-walled carbon nanotubes

Graphene quantum dots (GQDs), which are edge-bound nanometer-size graphene pieces, have fascinating electronic and optical properties due to their quantum confinement and edge effect. In this paper, GQDs were synthesized by using acid treatment and chemical exfoliation of multi-walled carbon nanotubes (MWCNTs). The structure of the GQDs was investigated by transmission electron microscope. The GQDs have a uniform size distribution, zigzag edge structure and two-dimensional morphology. The results indicated that the GQDs have bright blue emission upon UV excitation. The highly fluorescent GQDs exhibited high water solubility and good stability. It is shown that the acid treatment of MWCNTs leads to the formation of the functional group in zigzag sites, which results in the pH-dependent fluorescence of the GQDs.
Authors:
; ; ;  [1]
  1. Institute of Optoelectronic Technology, Fuzhou University, Fuzhou 350002 (China)
Publication Date:
OSTI Identifier:
22283158
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARBON NANOTUBES; CONFINEMENT; EXCITATION; FLUORESCENCE; GRAPHENE; MORPHOLOGY; OPTICAL PROPERTIES; PH VALUE; PHASE STABILITY; QUANTUM DOTS; TRANSMISSION ELECTRON MICROSCOPY; TWO-DIMENSIONAL CALCULATIONS