Nano Research

, Volume 10, Issue 6, pp 2046–2055

High-resolution characterization of hexagonal boron nitride coatings exposed to aqueous and air oxidative environments

  • Lanlan Jiang
  • Na Xiao
  • Bingru Wang
  • Enric Grustan-Gutierrez
  • Xu Jing
  • Petr Babor
  • Miroslav Kolíbal
  • Guangyuan Lu
  • Tianru Wu
  • Haomin Wang
  • Fei Hui
  • Yuanyuan Shi
  • Bo Song
  • Xiaoming Xie
  • Mario Lanza
Research Article

DOI: 10.1007/s12274-016-1393-2

Cite this article as:
Jiang, L., Xiao, N., Wang, B. et al. Nano Res. (2017) 10: 2046. doi:10.1007/s12274-016-1393-2

Abstract

Hexagonal boron nitride (h-BN) is believed to offer better passivation to metallic surfaces than graphene owing to its insulating nature, which facilitates blocking the flow of electrons, thereby preventing the occurrence of galvanic reactions. Nevertheless, this may not be the case when an h-BN-protected material is exposed to aqueous environments. In this work, we analyzed the stability of mono and multilayer h-BN stacks exposed to H2O2 and atmospheric conditions. Our experiments revealed that monolayer h-BN is as inefficient as graphene as a protective coating when exposed to H2O2. Multilayer h-BN offered a good degree of protection. Monolayer h-BN was found to be ineffective in an air atmosphere as well. Even a 10–15 layers-thick h-BN stack could not completely protect the surface of the metal under consideration. By combining Auger electron spectroscopy and secondary ion mass spectrometry techniques, we observed that oxygen could diffuse through the grain boundaries of the h-BN stack to reach the metallic substrate. Fortunately, because of the diffusive nature of the process, the oxidized area did not increase with time once a saturated state was reached. This makes multilayer (not monolayer) h-BN a suitable long-term oxidation barrier. Oxygen infiltration could not be observed by X-ray photoelectron spectroscopy. This technique cannot assess the chemical composition of the deeper layers of a material. Hence, the previous reports, which relied on XPS to analyze the passivating properties of h-BN and graphene, may have ignored some important subsurface phenomena. The results obtained in this study provide new insights into the passivating properties of mono and multilayer h-BN in aqueous media and the degradation kinetics of h-BN-coated metals exposed to an air environment.

Keywords

hexagonal boron nitride protective coating local oxidation nanoscale two-dimensional (2D) materials 

Supplementary material

12274_2016_1393_MOESM1_ESM.pdf (647 kb)
High-resolution characterization of hexagonal boron nitride coatings exposed to aqueous and air oxidative environments

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Lanlan Jiang
    • 1
  • Na Xiao
    • 1
  • Bingru Wang
    • 1
  • Enric Grustan-Gutierrez
    • 1
  • Xu Jing
    • 1
  • Petr Babor
    • 2
  • Miroslav Kolíbal
    • 2
  • Guangyuan Lu
    • 3
  • Tianru Wu
    • 3
  • Haomin Wang
    • 2
  • Fei Hui
    • 1
  • Yuanyuan Shi
    • 1
  • Bo Song
    • 1
  • Xiaoming Xie
    • 3
    • 4
  • Mario Lanza
    • 1
  1. 1.Institute of Functional Nano & Soft Materials (FUNSOM)Soochow UniversitySuzhouChina
  2. 2.CEITEC BUTBrno University of TechnologyBrnoCzech Republic
  3. 3.State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystems and Information TechnologyChinese Academy of SciencesShanghaiChina
  4. 4.School of Physical Science and TechnologyShanghai Tech UniversityShanghaiChina

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