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Title: Interplay between intercalated oxygen superstructures and monolayer h -BN on Cu(100)

Abstract

The confinement effect of intercalated atoms in van der Waals heterostructures can lead to interesting interactions between the confined atoms or molecules and the overlaying two-dimensional (2D) materials. In this paper, we report the formation of ordered Cu(100) p(2×2) oxygen superstructures by oxygen intercalation under the monolayer hexagonal boron nitride (h-BN) on Cu after annealing. By using scanning tunneling microscopy and x-ray photoelectron spectroscopy, we identify the superstructure and reveal its roles in passivating the exposed Cu surfaces, decoupling h-BN and Cu, and disintegrating h-BN monolayers. The oxygen superstructure appears as a 2D pattern on the exposed Cu surface or quasi-1D stripes of paired oxygen intercalated in the interface of h-BN and Cu predominantly oriented along the moiré modulations. The oxygen superstructure is shown to etch the overlaying h-BN monolayer in a thermal annealing process. After extended annealing, the h-BN monolayer disintegrates into nanoislands with zigzag edges. Finally, we discuss the implications of these findings on the stability and oxidation resistance of h-BN and relate them to challenges in process integration and 2D heterostructures.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences; Univ. of Tennessee, Knoxville, TN (United States); Korea Research Inst. of Standards and Science, Daejeon (Korea, Republic of); Korea Univ. of Science and Technology, Daejeon (Korea, Republic of). Dept. of Nano Science
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences; Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1302884
Alternate Identifier(s):
OSTI ID: 1298339
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Ma, Chuanxu, Park, Jewook, Liu, Lei, Kim, Yong-Sung, Yoon, Mina, Baddorf, Arthur P., Gu, Gong, and Li, An-Ping. Interplay between intercalated oxygen superstructures and monolayer h -BN on Cu(100). United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.064106.
Ma, Chuanxu, Park, Jewook, Liu, Lei, Kim, Yong-Sung, Yoon, Mina, Baddorf, Arthur P., Gu, Gong, & Li, An-Ping. Interplay between intercalated oxygen superstructures and monolayer h -BN on Cu(100). United States. doi:10.1103/PhysRevB.94.064106.
Ma, Chuanxu, Park, Jewook, Liu, Lei, Kim, Yong-Sung, Yoon, Mina, Baddorf, Arthur P., Gu, Gong, and Li, An-Ping. Thu . "Interplay between intercalated oxygen superstructures and monolayer h -BN on Cu(100)". United States. doi:10.1103/PhysRevB.94.064106. https://www.osti.gov/servlets/purl/1302884.
@article{osti_1302884,
title = {Interplay between intercalated oxygen superstructures and monolayer h -BN on Cu(100)},
author = {Ma, Chuanxu and Park, Jewook and Liu, Lei and Kim, Yong-Sung and Yoon, Mina and Baddorf, Arthur P. and Gu, Gong and Li, An-Ping},
abstractNote = {The confinement effect of intercalated atoms in van der Waals heterostructures can lead to interesting interactions between the confined atoms or molecules and the overlaying two-dimensional (2D) materials. In this paper, we report the formation of ordered Cu(100) p(2×2) oxygen superstructures by oxygen intercalation under the monolayer hexagonal boron nitride (h-BN) on Cu after annealing. By using scanning tunneling microscopy and x-ray photoelectron spectroscopy, we identify the superstructure and reveal its roles in passivating the exposed Cu surfaces, decoupling h-BN and Cu, and disintegrating h-BN monolayers. The oxygen superstructure appears as a 2D pattern on the exposed Cu surface or quasi-1D stripes of paired oxygen intercalated in the interface of h-BN and Cu predominantly oriented along the moiré modulations. The oxygen superstructure is shown to etch the overlaying h-BN monolayer in a thermal annealing process. After extended annealing, the h-BN monolayer disintegrates into nanoislands with zigzag edges. Finally, we discuss the implications of these findings on the stability and oxidation resistance of h-BN and relate them to challenges in process integration and 2D heterostructures.},
doi = {10.1103/PhysRevB.94.064106},
journal = {Physical Review B},
issn = {2469-9950},
number = 6,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}

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