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A Universal Atomic Substitution Conversion Strategy Towards Synthesis of Large‑Size Ultrathin nonlayered Two‑Dimensional Materials

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Nano-Micro Letters 2021年第11期13卷 79-91页

作者： Mei Zhao Sijie Yang Kenan Zhang Lijie Zhang Ping Chen Sanjun Yang Yang Zhao Xiang Ding Xiaotao Zu Yuan Li Yinghe Zhao Liang Qiao Tianyou Zhai School of Physics University of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074People’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial TechnologiesCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035People’s Republic of China

nonlayered two-dimensional(2D)materials have attracted increasing attention,due to novel physical properties,unique surface structure,and high compatibility with microfabrication ***,owing to the inherent strong covalent bonds,the direct synthesis of 2D planar structure from nonlayered materials,especially for the realization of large-size ultrathin 2D nonlayered materials,is still a huge ***,a general atomic substitution conversion strategy is proposed to synthesize large-size,ultrathin nonlayered 2D *** nonlayered CdS as a typical example,large-size ultrathin nonlayered CdS single-crystalline flakes are successfully achieved via a facile low-temperature chemical sulfurization method,where pre-grown layered CdI2 flakes are employed as the precursor via a simple hot plate assisted vertical vapor deposition *** size and thickness of CdS flakes can be controlled by the CdI2 *** growth mechanism is ascribed to the chemical substitution reaction from I to S atoms between CdI2 and CdS,which has been evidenced by experiments and theoretical *** atomic substitution conversion strategy demonstrates that the existing 2D layered materials can serve as the precursor for difficult-to-synthesize nonlayered 2D materials,providing a bridge between layered and nonlayered materials,meanwhile realizing the fabrication of large-size ultrathin nonlayered 2D materials.

关键词： nonlayered 2D materials Large-size ultrathin CdS flakes Atomic substitution conversion layered-nonlayered structural transformation

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