Facile synthesis of highly fluorescent free-standing films comprising of graphitic carbon nitride (g-C3N4) nanolayers
Astounding graphitic carbon nitride (g-C3N4) nanostructures have attracted huge attention due to its unique electronic structures, suitable band gap, thermal and chemical stability insinuating as a promising candidate for photocatalytic and energy harvesting applications. 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 (15mm × 10mm × 0.5mm) comprising of g-C3N4 nanolayers by the pyrolysis of dicyandiamide (C2H4N4) utilizing chemical vapor deposition (CVD) technique. The synthesis is done under low-pressure conditions of Argon ( ̴ 3 Torr) and at a temperature of 600 0C. The as-synthesized g-C3N4 films are systematically studied for their structural/microstructural characterization by using X-ray diffraction (XRD), scanning & transmission electron microscopy (SEM and TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and UV-visible spectroscopy techniques. Excitation dependent photoluminescence (PL) spectra of the as-synthesized g-C3N4 film exhibit an intense, stable and broad emission peak in the visible region ~ 459 nm. The free standing g-C3N4 films emission spectra shows a blue shift and band sharpening as compared to the g-C3N4 powder.