Understanding the structural, electrical, and optical properties of monolayer h-phase RuO2 nanosheets: A combined experimental and computational study

Dong Su Ko, Woo Jin Lee, Soohwan Sul, Changhoon Jung, Dong Jin Yun, Hee Goo Kim, Won Joon Son, Jae Gwan Chung, Doh Won Jung, Se Yun Kim, Jeongmin Kim, Wooyoung Lee, Chan Kwak, Jai Kwang Shin, Jung Hwa Kim, Jong Wook Roh

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Abstract

The structural, electrical, and optical properties of monolayer ruthenium oxide (RuO2) nanosheets (NSs) fabricated by chemical exfoliation of a layered three-dimensional form of K-intercalated RuO2 are studied systematically via experimental and computational methods. Monolayer RuO2 NS is identified as having a distorted h-MX2 structure. This is the first observation of a RuO2 NS structure that is unlike the t-MX2 structure of the RuO2 layers in the parent material and does not have hexagonal symmetry. The distorted h-MX2 RuO2 NSs are shown to have optical transparency superior to that of graphene, thereby predicting the feasibility of applying RuO2 NSs to flexible transparent electrodes. In addition, it is demonstrated that the semiconducting band structures of RuO2 NSs can be manipulated to be semi-metallic by adjusting the crystal structure, which is related to band-gap engineering. This finding indicates that RuO2 NSs can be used in a variety of applications, such as flexible transparent electrodes, atomic-layer devices, and optoelectronic devices.

Original languageEnglish
Pages (from-to)266-276
Number of pages11
JournalNPG Asia Materials
Volume10
Issue number4
DOIs
Publication statusPublished - 2018 Apr 1

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All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ko, D. S., Lee, W. J., Sul, S., Jung, C., Yun, D. J., Kim, H. G., Son, W. J., Chung, J. G., Jung, D. W., Kim, S. Y., Kim, J., Lee, W., Kwak, C., Shin, J. K., Kim, J. H., & Roh, J. W. (2018). Understanding the structural, electrical, and optical properties of monolayer h-phase RuO2 nanosheets: A combined experimental and computational study. NPG Asia Materials, 10(4), 266-276. https://doi.org/10.1038/s41427-018-0020-y