EXFOLIATED NANOSHEETS OF GRAPHITIC CARBON NITRIDE: STUDY OF OPTICAL AND PHOTOELECTROCHEMICAL PROPERTIES

1 KOČÍ Kamila
Co-authors:
1 RELI Martin 1,2 SVOBODA Ladislav 1,2 PRAUS Petr
Institutions:
1 VSB – Technical University of Ostrava, Institute of Environmental Technology, Ostrava, Czech Republic, EU, kamila.koci@vsb.cz
2 VSB – Technical University of Ostrava, Department of Chemistry, Ostrava, Czech Republic, EU, kamila.koci@vsb.cz
Conference:
8th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 19th - 21st 2016
Proceedings:
Proceedings 8th International Conference on Nanomaterials - Research & Application
Pages:
98-103
ISBN:
978-80-87294-71-0
ISSN:
2694-930X
Published:
17th March 2017
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
67 views / 48 downloads
Abstract

The graphitic carbon nitride (g-C3N4) samples were prepared by the three different methods: (i) heating of melamine at 600 ºC (bulk g-C3N4), (ii) exfoliation of bulk g-C3N4 by heating at 500 ºC (Ex500) and (iii) exfoliation of bulk g-C3N4 by ultrasonication in an aqueous dispersion (ExUltra). The exfoliation was performed to obtain g-C3N4 nanosheets or other nanostructures. The samples characterization was performed by UV-Vis diffuse reflectance (DRS UV-Vis), photoluminescence (PL) spectroscopy and photoelectrochemical (PEC) measurement. The smallest transition energies Et was evaluated for bulk g-C3N4 (Et = 2.84 eV). The exfoliation by heating and ultrasonication caused both increase of transition energies Et at 3.07 eV and blue-shift and intensity increase of PL emission bands. The exfoliation by heating at 500 ºC increased photocurrent in comparison with the bulk g-C3N4 and ultrasonicated samples. This indicates the beneficial effect of the exfoliation by heating for various photocatalytic applications due to the higher mobility and separation efficiency of photo-induced carriers.

Keywords: Graphitic carbon nitride, optical properties, photoelectrochemical properties

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