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Recovery Behavior of the Luminescence Peak from Graphitic Carbon Nitride as a Function of the Synthesis Temperature
Author(s) -
Chubenko Eugene B.,
Denisov Nikita M.,
Baglov Aleksey V.,
Bondarenko Vitaly P.,
Uglov Vladimir V.,
Borisenko Viktor E.
Publication year - 2020
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201900163
Subject(s) - photoluminescence , graphitic carbon nitride , luminescence , analytical chemistry (journal) , materials science , carbon nitride , fourier transform infrared spectroscopy , oxygen , spectroscopy , band gap , scanning electron microscope , photochemistry , chemistry , chemical engineering , optoelectronics , organic chemistry , photocatalysis , catalysis , physics , quantum mechanics , engineering , composite material
Graphitic carbon nitride (g‐C 3 N 4 ) 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‐C 3 N 4 doped by oxygen while its recovery behavior is controlled by thermally induced oxygen‐assisted disruption of sp 2 bonds in C‐N π‐orbital conjugated system of tri‐s‐triazine units building polymer sheets in g‐C 3 N 4 .