Basal plane bending of 6H-SiC single crystals observed by synchrotron radiation X-ray topography

Ning, Lixin; Wang, Yingmin; Xu, Xiangang; Gao, Yuqiang; Yan, Peng; Chen, Xiufang; Huang, Wanxia; Qin, Yuan

doi:10.1107/s002188980904196x

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…[ 18 ] Accordingly, the relative peak intensity ratio (I 1/2 ) can also reflect the degree of π – π interaction. [ 23 ] The I 1/2 of 8%PTCDA/PTA is 1.96, which is significantly higher than that of PTA (1.57), indicating that PTCDA promotes the degree of π – π stacking, [ 24 ] which is consistent with the tendency of FT‐IR results.…”

Section: Resultssupporting

confidence: 64%

Molecule Dipole and Steric Hindrance Engineering to Modulate Electronic Structure of PTCDA/PTA for Highly Efficient Photocatalytic Hydrogen Evolution and Antibiotics Degradation

Yu,

Fang,

Wang

et al. 2023

Adv Funct Materials

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Insufficient charge separation and slow exciton transport severely limit the utilization of perylene‐plane‐based organic photocatalysts. Herein, a novel PTCDA/PTA (perylene‐3,4,9,10‐tetracarboxylic dianhydride/perylenetetracarboxylic acid) is successfully prepared for the first time by the in situ crystallization of PTA on the surface of PTCDA through π–π interaction. The PTCDA/PTA loading with 8%PTCDA showed the optimum photocatalytic performance. The photocatalytic H2 evolution rate reached 45.06 mmol g−1 h−1, which is 1.93‐fold and 4506.00‐fold higher than that of pure PTA and PTCDA. Meanwhile, it also exhibited excellent antibiotics photodegradation activities, in which both the removal efficiency of tetracycline hydrochloride (TC‐HCl) and ofloxacin (OFL) are more over 90% within 30 min. By modulating the structures of perylene plane, the steric hindrance and internal dipole moments can be precisely tuned. These lead to the change of stacking mode, promoting the degree of π–π stacking and formation of strong internal electric field, while improved the photocatalytic activity. Excited state density functional theory (DFT) calculations unveil the redistribution of electron‐hole pairs, which obeys a type II mechanism. The proposed photocatalytic mechanism is determined by liquid chromatography‐mass spectrometry (LC‐MS). Besides, the toxicities of the degradation products are also evaluated. The work provides useful strategy for the design of high‐performance and multifunctional photocatalysts toward water remediation and energy production.

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Section: Resultssupporting

confidence: 64%

Molecule Dipole and Steric Hindrance Engineering to Modulate Electronic Structure of PTCDA/PTA for Highly Efficient Photocatalytic Hydrogen Evolution and Antibiotics Degradation

Yu,

Fang,

Wang

et al. 2023

Adv Funct Materials

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“…The diffraction peak position of omega rocking curves shifts as the beam position changed along the wafer. This shift corresponds to basal plane bending which originate from plastic deformation during SiC single crystal growth [6]. Through control of growth process, reducing of surface bending is achieved.…”

Section: Resultsmentioning

confidence: 99%

Wafer-Scale Graphene on 4-Inch SiC

Chen

et al. 2016

MSF

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Wafer-scale graphene on SiC with uniform structural features was grown on semi-insulating 4 inch on-axis 4H-SiC (0001) face. Growth was carried out in a conventional physical vapor transport (PVT) growth system. Atmospheric pressure graphitization and a “face-down” orientation were account for the high uniformity of graphene. Atomic force microscopy, electrostatic force microscopy and Raman spectroscopy were used to confirm the uniformity of surface morphology and layer number. Electrical properties were also characterized by Hall measurements on 15×15mm2 samples sawed from the wafer. An average Hall mobility of about 2000cm2/Vs was obtained.

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