Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62009
Title: Potassium doping : tuning the optical properties of graphene quantum dots
Authors: Qian, F
Li, X
Tang, L
Lai, SK
Lu, C
Lau, SP 
Issue Date: 2016
Publisher: American Institute of Physics
Source: AIP advances, 2016, v. 6, no. 7, 075116 How to cite?
Journal: AIP advances 
Abstract: Doping with hetero-atoms is an effective way to tune the properties of graphene quantum dots (GQDs). Here, potassium-doped GQDs (K-GQDs) are synthesized by a one-pot hydrothermal treatment of sucrose and potassium hydroxide solution. Optical properties of the GQDs are altered as a result of K-doping. The absorption peaks exhibit a blue shift. Multiple photoluminescence (PL) peaks are observed as the excitation wavelength is varied from 380 nm to 620 nm. New energy levels are introduced into the K-GQDs and provide alternative electron transition pathways. The maximum PL intensity of the K-GQDs is obtained at an excitation wavelength of 480 nm which is distinct from the undoped GQDs (375 nm). The strong PL of the K-GQDs at the longer emission wavelengths is expected to make K-GQDs more suitable for bioimaging and optoelectronic applications.
URI: http://hdl.handle.net/10397/62009
ISSN: 2158-3226 (online)
DOI: 10.1063/1.4959906
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