Recovery Behavior of the Luminescence Peak from Graphitic Carbon Nitride as a Function of the Synthesis Temperature,Crystal Research and Technology

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Recovery Behavior of the Luminescence Peak from Graphitic Carbon Nitride as a Function of the Synthesis Temperature
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2020-02-05 , DOI: 10.1002/crat.201900163
Eugene B. Chubenko ₁ , Nikita M. Denisov ₁ , Aleksey V. Baglov ₁ , Vitaly P. Bondarenko ₁ , Vladimir V. Uglov _{2,

3} , Viktor E. Borisenko _{1,

4}

Affiliation

Graphitic 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.

中文翻译：

作为合成温度函数的石墨氮化碳发光峰的恢复行为

石墨氮化碳 (g-C3N4) 是通过硫脲的热分解和随后在 450–625 °C 的含氧环境中原位聚合产物合成的，并用扫描电子显微镜、X 射线衍射、能量色散X 射线光谱、傅里叶变换红外光谱和光致发光技术。合成材料含有浓度随加工温度从 4.8at% 增加到 9.8at% 的氧。发现光致发光峰随着温度升高到 575 °C 发生红移，然后在较高温度下发生蓝移。

更新日期：2020-02-05

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