Yang Wenjin, Li Jing, Zhang Xinglai, Zhang Cai, Jiang Xin, Liu Baodan
Shenyang National Laboratory for Materials Science (SYNL) , Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS) , No. 72 Wenhua Road , Shenyang 110016 , China.
School of Materials Science and Engineering , University of Science and Technology of China , No. 72 Wenhua Road , Shenyang 110016 , China.
Inorg Chem. 2019 Jan 7;58(1):549-556. doi: 10.1021/acs.inorgchem.8b02742. Epub 2018 Dec 11.
The peculiar physical and chemical properties of 2D nanostructures have aroused global research interest in developing new members, synthetic technology, and exploring their potential applications in functional nanodevices. However, it is extremely challenging to directly obtain the 2D nanosheets for these extrinsic layered structures using conventional routines. In this work, we demonstrate the facile and general synthesis of 2D spinel-type metal oxides nanosheets through a simple hydrothermal reaction. Using this method, cubic γ-GaO, ZnGaO and MnGaO nanosheets with triangular/hexagonal configuration and ultrathin thickness have been synthesized, and all these nanosheets show preferential growth along (111) plane with the minimum formation energy. Microstructural and composition analyses using HRTEM, EDS, XPS, and so on reveal that the as-synthesized 2D nanosheets are well-crystallized in cubic fcc-phase and show high purity in composition, and the formation process of MGaO nanosheets can be regarded as the competition of M and Ga in tetrahedral site. Spatially resolved cathodoluminescence measurement of individual 2D nanosheet shows that the γ-GaO, ZnGaO, and MnGaO nanosheets exhibit distinct luminescence behavior, and ZnGaO nanosheets show the strongest emission in visible region. It is expected that the facile synthesis of spinel-type metal oxides of γ-GaO, ZnGaO, and MnGaO nanosheets will further promote the exploration of a variety of semiconductor nanostructures that could not be achieved using conventional technology suitable for layered structures and will also open up some opportunities for the integration of advanced functional nanodevices such as photodetectors, phosphors on the basis of them.
二维纳米结构独特的物理和化学性质引发了全球对开发新成员、合成技术以及探索其在功能纳米器件中的潜在应用的研究兴趣。然而，使用传统方法直接获得这些外在层状结构的二维纳米片极具挑战性。在这项工作中，我们展示了通过简单的水热反应轻松且通用地合成二维尖晶石型金属氧化物纳米片。使用这种方法，已经合成了具有三角形/六边形构型和超薄厚度的立方γ-GaO、ZnGaO和MnGaO纳米片，并且所有这些纳米片都沿着具有最小形成能的(111)面优先生长。使用高分辨率透射电子显微镜（HRTEM）、能谱仪（EDS）、X射线光电子能谱（XPS）等进行的微观结构和成分分析表明，合成的二维纳米片在立方面心立方相（fcc相）中结晶良好，并且在成分上显示出高纯度，并且MGaO纳米片的形成过程可被视为M和Ga在四面体位置的竞争。对单个二维纳米片进行的空间分辨阴极发光测量表明，γ-GaO、ZnGaO和MnGaO纳米片表现出不同的发光行为，并且ZnGaO纳米片在可见光区域显示出最强的发射。预计γ-GaO、ZnGaO和MnGaO纳米片的尖晶石型金属氧化物的简便合成将进一步促进对使用适用于层状结构的传统技术无法实现的各种半导体纳米结构的探索，并且还将为基于它们的先进功能纳米器件（如光电探测器、磷光体）的集成开辟一些机会。
