Two-dimensional(2D)MoO_(2),a binary nonlayered material,has been extensively studied for potential applications in catalysis and electronics.However,the preparation of 2D MoO_(2) remains challenging.Herein,we report t...Two-dimensional(2D)MoO_(2),a binary nonlayered material,has been extensively studied for potential applications in catalysis and electronics.However,the preparation of 2D MoO_(2) remains challenging.Herein,we report the growth of 2D MoO_(2) flakes with rhombic morphology on the sapphire substrate via a chemical vapor deposition(CVD)method.Atomic force microscopy shows the CVDgrown MoO_(2) flakes with thin thickness.The CVD-obtained MoO_(2) with a stoichiometric ratio of 1:2 is verified using energy-dispersive X-ray spectroscopy.Scanning transmission electron microscopy(STEM)characterization reveals the high-quality,single-crystal nature of the CVDderived 2D MoO_(2) flakes.展开更多
Aromatic carbon nitride(PhCN),as an emerging semiconductor material,has attracted much attention due to its excellent optical properties.Fully understanding the synthesis mechanism,chemical structure,and optical prope...Aromatic carbon nitride(PhCN),as an emerging semiconductor material,has attracted much attention due to its excellent optical properties.Fully understanding the synthesis mechanism,chemical structure,and optical properties of PhCN would significantly promote its progress in synthesis,modifications and applications.Here the chemical structures and optical properties of PhCN and intermediates have been systematically studied,and hereby the synthesis mechanism of PhCN is explicitly proposed for the first time.The results show that the precursor 2,4-diamino-6-phenyl-1,3,5-triazine(DPT)is deaminated to form the DPT dimer,trimer and polymers,and then the triazine was isomerized to tri-s-triazine by a ringopening isomerization reaction to form PhCN.Meanwhile,the correlation between structural and optical properties of PhCN and intermediates demonstrates the electron delocalization effect of the phenyl group and reveals that highly polymerized PhCN has a more stable molecular structure,thus exhibiting more stable photophysical properties.Our work provides a fundamental study from synthesis to structures and optical properties of PhCN,which will certainly promote its deeper research and wider application.展开更多
基金supported by the Science and Technology Plan Project of Tangshan Science and Technology Bureau(No.22130217H)the Natural Science Foundation-Steel and Iron Foundation of Hebei Province(No.E2022209114)the Open Research Fund from Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology(No.221004-K).
文摘Two-dimensional(2D)MoO_(2),a binary nonlayered material,has been extensively studied for potential applications in catalysis and electronics.However,the preparation of 2D MoO_(2) remains challenging.Herein,we report the growth of 2D MoO_(2) flakes with rhombic morphology on the sapphire substrate via a chemical vapor deposition(CVD)method.Atomic force microscopy shows the CVDgrown MoO_(2) flakes with thin thickness.The CVD-obtained MoO_(2) with a stoichiometric ratio of 1:2 is verified using energy-dispersive X-ray spectroscopy.Scanning transmission electron microscopy(STEM)characterization reveals the high-quality,single-crystal nature of the CVDderived 2D MoO_(2) flakes.
基金supported by the Taishan Scholar Program,Natural Science Foundation of Qingdao,China(23-2-1-245-zyyd-jch)National Natural Science Foundation of China(52171140).
文摘Aromatic carbon nitride(PhCN),as an emerging semiconductor material,has attracted much attention due to its excellent optical properties.Fully understanding the synthesis mechanism,chemical structure,and optical properties of PhCN would significantly promote its progress in synthesis,modifications and applications.Here the chemical structures and optical properties of PhCN and intermediates have been systematically studied,and hereby the synthesis mechanism of PhCN is explicitly proposed for the first time.The results show that the precursor 2,4-diamino-6-phenyl-1,3,5-triazine(DPT)is deaminated to form the DPT dimer,trimer and polymers,and then the triazine was isomerized to tri-s-triazine by a ringopening isomerization reaction to form PhCN.Meanwhile,the correlation between structural and optical properties of PhCN and intermediates demonstrates the electron delocalization effect of the phenyl group and reveals that highly polymerized PhCN has a more stable molecular structure,thus exhibiting more stable photophysical properties.Our work provides a fundamental study from synthesis to structures and optical properties of PhCN,which will certainly promote its deeper research and wider application.
