Abstract
AbstractGraphitic carbon nitride (g‐C3N4) is synthesized by thermal decomposition of thiourea and subsequent in situ polymerization of the products in the oxygen‐containing ambient at 450–625 °C and studied with scanning electron microscopy, X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, Fourier‐transform infrared spectroscopy, and photoluminescence techniques. The synthesized material contains oxygen at a concentration increasing with the processing temperature from 4.8 to 9.8 at %. The photoluminescence peak is found to be red‐shifted with the temperature increased to 575 °C becoming then blue‐shifted at higher temperatures. The observed red‐shift of the photoluminescence peak is supposed to be caused by band‐gap narrowing in g‐C3N4 doped by oxygen while its recovery behavior is controlled by thermally induced oxygen‐assisted disruption of sp2 bonds in C‐N π‐orbital conjugated system of tri‐s‐triazine units building polymer sheets in g‐C3N4.
Published Version
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