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Growth of Highly Anisotropic 2D Ternary CaTe 2 O 5 Flakes on Molten Glass
Author(s) -
Duan Jincai,
Huang Pu,
Liu Kailang,
Jin Bao,
Suleiman Abdulsalam Aji,
Zhang Xiuwen,
Zhou Xing,
Zhai Tianyou
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201903216
Subject(s) - materials science , ternary operation , anisotropy , soda lime glass , substrate (aquarium) , chemical vapor deposition , glass transition , chemical engineering , nanotechnology , composite material , optics , polymer , oceanography , physics , engineering , computer science , programming language , geology
Two‐dimensional (2D) ternary compounds (2DTCs) have attracted intensive attention due to the new degree of freedom of modulating physical and chemical properties. However, the controllable synthesis of 2DTCs still remains a great challenge impeding further research and applications. Here, for the first time, ultrathin (≈7.4 nm) ε‐CaTe 2 O 5 flakes with high anisotropy are obtained by a chemical vapor deposition method using soda‐lime glass as the capture substrate. The molten glass adsorbs Te vapor in the gas flow to its surface, which reacts with CaO in the molten substrate leading to the precipitation of ε‐CaTe 2 O 5 . Interestingly, ε‐CaTe 2 O 5 flakes display highly anisotropic band structures and optical properties. Furthermore, low‐temperature electrical measurements show that the metal–semiconductor/insulator transition of ε‐CaTe 2 O 5 is exhibited at about 130 K, and optical phonon assisted hopping of small polarons becomes dominant within the temperature range of 130–300 K. Employing soda‐lime glass as the capture substrate may provide a new approach for the synthesis of 2DTCs.