期刊
NANOSCALE
卷 7, 期 29, 页码 12343-12350出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr02905h
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资金
- Singapore National Research Foundation via fellowship grant [NRF-RF2009-06]
- Ministry of Education via tier2 grant [MOE2012-T2-2-086]
- Ministry of Education via tier1 grant [2013-T1-002-232]
- European Union Seventh Framework Program [312483]
- German DAAD scholarship program
- Spanish MINECO Severo Ochoa Excellence Program at ICN2
- Generalitat de Catalunya [2014SGR1638]
- ICREA Funding Source: Custom
Graphitic carbon nitride (g-C3N4), a metal-free semiconductor with a band gap of 2.7 eV, has received considerable attention owing to its fascinating photocatalytic performances under visible-light. g-C3N4 exhibits high thermal and chemical stability and non-toxicity such that it has been considered as the most promising photocatalyst for environmental improvement and energy conservation. Hence, it is of great importance to obtain high-quality g-C3N4 and gain a clear understanding of its optical properties. Herein, we report a high-yield synthesis of g-C3N4 products via heating of high vacuum-sealed melamine powder in an ampoule at temperatures between 450 and 650 degrees C. Using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), electron energy loss spectroscopy (EELS), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), the chemical composition and crystallization of the as-produced g-C3N4 are demonstrated. A systematic optical study of g-C3N4 is carried out with several approaches. The optical phonon behavior of g-C3N4 is revealed by infrared and Raman spectroscopy, and the emission properties of g-C3N4 are investigated using photoluminescence (PL) spectroscopy, while the photocatalytic properties are explored by the photodegradation experiment.
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