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Nano Research

Article Title

Controlled growth of uniform two-dimensional ZnO overlayers on Au(111) and surface hydroxylation

Authors

Hao Wu, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China Department of Chemical Physics, University of Science and Technology of China, Hefei 2300263, China
Qiang Fu, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Yifan Li, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China Department of Chemical Physics, University of Science and Technology of China, Hefei 2300263, China
Yi Cui, Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Rui Wang, Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Nan Su, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China Department of Chemical Physics, University of Science and Technology of China, Hefei 2300263, China
Le Lin, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Aiyi Dong, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Yanxiao Ning, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Fan Yang, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Xinhe Bao, State Key Lab of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China Department of Chemical Physics, University of Science and Technology of China, Hefei 2300263, China

Keywords

graphene-like ZnO, two-dimensional materials, hydroxylation, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), scanning tunneling microscopy (STM)

Abstract

Ultrathin ZnO nanostructures present interesting two-dimensional (2D) graphene-like structure in contrast to wurtzite structure in bulk ZnO. Growth on Au(111) has been regarded as a well-established route to the 2D ZnO layers while controlled growth of uniform ZnO nanostructures remains as a challenge. Here, reactive deposition of Zn in O3 and NO2 was employed, which is investigated by scanning tunneling microscopy and X-ray photoelectron spectroscopy (XPS). We demonstrate that uniform ZnO monolayer nanoislands and films can be obtained on Au(111) using O3 and uniform ZnO bilayer nanoislands and films form on Au(111) using NO2, respectively. Formation of atomic oxygen overlayers on Au(111) via exposure to O3 is critical to the formation of uniform ZnO monolayer nanostructures atop. Near ambient pressure XPS studies revealed that nearly full hydroxylation occurs on monolayer ZnO structures upon exposure to near ambient pressure water vapor or atomic hydrogen species, while partial surface hydroxylation happens on bilayer ZnO under the same gaseous exposure conditions.

Graphical Abstract

Publisher

Tsinghua University Press

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