journal article·2018-08-28Open access

Solution-Based, Template-Assisted Realization of Large-Scale Graphitic ZnO

Kyle B. Tom, Shuren Lin, Liwen F. Wan, Jie Wang, Nolan Ahlm, Alpha T. N’Diaye, Karen Bustillo, Junwei Huang, Yin Liu, Shuai Lou, Rui Chen, Shancheng Yan, Hui Wu, Dafei Jin, Hongtao Yuan, David Prendergast, Jie Yao

ACS Nano· Volume 12· Issue 8

Abstract

With a honeycomb single-atomic-layer structure similar to those of graphene and hexagonal boron nitride (hBN), the graphitic phase of ZnO (gZnO) have been predicted to offer many advantages for engineering, including high-temperature stability in ambient conditions and great potential in heterostructure applications. However, there is little experimental data about this hexagonal phase due to the difficulty of synthesizing large-area gZnO for characterization and applications. In this work, we demonstrate a solution-based approach to realize gZnO nanoflakes with thicknesses down to a monolayer and sizes up to 20 μm. X-ray photoelectron spectroscopy, X-ray absorption near-edge spectroscopy, photoluminescence, atomic force microscopy, and electron microscopy characterizations are conducted on synthesized gZnO samples. Measurements show significant changes to the electronic band structure compared to its bulk phase, including an increase of the band gap to 4.8 eV. The gZnO nanosheets also exhibit excellent stability at temperatures as high as 800 °C in ambient environment. This wide band gap layered material provides us with a platform for harsh environment electronic devices, deep ultraviolet optical applications, and a practical alternative for hBN. Our synthesis method may also be applied to achieve other types of 2D oxides.
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Research context

OpenAlex topics: ZnO doping and properties · Ga2O3 and related materials · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Center for Nanoscale Materials, Nanoscience and Technology, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China

Nanjing University of Posts and Telecommunications, Nanjing 210023, P. R. China

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China

Funding

Lawrence Berkeley National Laboratory

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