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- Title
Graphene quantum dots-assisted exfoliation of graphitic carbon nitride to prepare metal-free zero-dimensional/two-dimensional composite photocatalysts.
- Authors
Qian, Jiajia; Yan, Jing; Shen, Chao; Xi, Fengna; Dong, Xiaoping; Liu, Jiyang
- Abstract
The high aspect-ratio morphology of two-dimensional (2D) nanostructures endues them with distinct advantages for photocatalytic or photoelectrical applications. Although various attempts have been devoted to the liquid exfoliation of graphitic carbon nitride (g-C3N4) to obtain ultrathin nanosheets (CNNSs), the high exfoliation efficiency, well preservation of in-planar structure and facile operation cannot be simultaneously realized. Furthermore, functionalization of CNNSs is highly desired to promote the capability of photoabsorption, charge separation and transfer. Herein, we one-step prepared well-dispersed graphene quantum dots (GQDs)-modified CNNSs (GQDs/CNNSs) colloids via a facile and efficient GQDs-assisted exfoliation approach in a normal ultrasonic water bath. The exfoliation procedure was optimized by tuning the dopant in GQDs, ultrasonic time and GQDs dosage. The obtained colloidal GQDs/CNNSs show a typical 2D morphology with lateral size of several 100 nm and ultrathin thickness of 1.5-1.8 nm. What is more, we can tailor the semiconductive behavior of GQDs by heteroatom doping and achieve a p-n-type P-doped GQDs-modified CNNSs colloids. This p-n GQDs/CNNSs material presents the enhanced separation efficiency of photoexcited carriers and photocatalytic activity in comparison with bulky g-C3N4 (CN) and other CNNSs materials from acid or alkali exfoliation.
- Subjects
NANOSTRUCTURES; PHOTOELECTRICITY; LIGHT absorption; CHARGE transfer; DOPING agents (Chemistry); PHOTOCATALYSIS; CATALYTIC activity
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 17, p12103
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2509-8