Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 6, Pages 2644-2651Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj05108b
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Funding
- USIEF & Fulbright Commission for Fulbright Nehru Academic and Professional Excellence Fellowship
- NSF [CHE 1807737]
- Japan Society for the Promotion of Science (JSPS) [P18063]
- JSPS KAKENHI [18F18063]
- Grants-in-Aid for Scientific Research [18F18063] Funding Source: KAKEN
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Astounding graphitic carbon nitride (g-C3N4) nanostructures have attracted huge attention due to their unique electronic structures, suitable band gap, and thermal and chemical stability, and are insinuating as a promising candidate for photocatalytic and energy harvesting applications. The growth of a free-standing film is desirable for widespread electronic devices and electrochemical applications. Here, we present a facile approach to prepare free-standing films (15 mm x 10 mm x 0.5 mm) comprising g-C3N4 nanolayers by the pyrolysis of dicyandiamide (C2H4N4) utilizing the chemical vapor deposition (CVD) technique. The synthesis is done under low-pressure conditions of argon (similar to 3 Torr) and at a temperature of 600 degrees C. The as-synthesized g-C3N4 films are systematically studied for their structural/microstructural characterization using X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and UV-visible spectroscopy techniques. The excitation-dependent photoluminescence (PL) spectra of the as-synthesized g-C3N4 film exhibited an intense, stable and broad emission peak in the visible region at similar to 459 nm. The emission spectra of free-standing g-C3N4 films show a blue shift and band sharpening compared to that of the g-C3N4 powder.
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