The sensing behavior of graphitic carbon nitride (g-C3N4) allotropes (fabricated with thermal polymerization of urea or melamine) by monitoring their laser induced room temperature photoluminescence (PL) emission, is demonstrated. Their sensing behavior has been investigated at oxygen atmosphere, upon optical excitation with a laser source (248 and 355 nm) in wavelength for different energy densities. The observed variability of PL features of g-C3N4, such as spectral intensity and wavelength, offers a systematic way to monitor the environmental changes in a reliable manner, opening the path for exploiting g-C3N4, as optical sensing material.
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