Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/70663
Title: Functionalization of graphene quantum dots by fluorine : preparation, properties, application, and their mechanisms
Authors: Zuo, WB
Tang, LB
Xiang, JZ
Ji, RB
Luo, L
Rogee, L 
Lau, SP 
Issue Date: 2017
Source: Applied physics letters, 2017, v. 110, no. 22, 221901, p. 221901-1-221901-5
Abstract: Graphene quantum dots (GQDs) possess unique photoelectronic properties ascribed to quantum confinement and edge effects, which have evoked important development and wide application in the optoelectronic field. Doping GQDs with heteroatoms can further modulate the energy band structure and thus produce unexpected properties. Herein, we obtained fluorine-doped GQDs (F-GQDs) by adopting an effective preparation technique, which includes the treatment of the as-prepared reaction precursor, fluorinated carbon fibers, with ultrasonic liquid phase exfoliation. The proposed method is simple, handy, and low-cost, opening up an alternate approach to prepare F-GQDs. Through multiple characterization techniques, the effective incorporation of fluorine in GQDs was confirmed, and the as-prepared F-GQDs exhibit excellent photoelectrical properties and good ultraviolet absorption performances. Accordingly, we have fabricated a vertical photovoltaic UV detector based on F-GQDs. The unoptimized device has an exceptionally large ratio of photocurrent to dark current of magnitude similar to 10(5), and its detectivity (D*) could stabilize at around 10(12) Jones at room temperature under lambda = 365 nm light irradiation and reverse bias voltage.
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.4984238
Rights: © 2017 Author(s).
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in W. B. Zuo et al., Appl. Phys. Lett. 110, 221901 (2017) and may be found at https://dx.doi.org/10.1063/1.4984238
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