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Fabrication and Surface Engineering of Two-Dimensional SnS Toward Piezoelectric Nanogenerator Application

Published online by Cambridge University Press:  25 April 2018

Naoki Higashitarumizu ,
Hayami Kawamoto ,
Keiji Ueno  and
Kosuke Nagashio
Naoki Higashitarumizu*
Affiliation:
Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo113-8656, Japan
Hayami Kawamoto
Affiliation:
Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo113-8656, Japan
Keiji Ueno
Affiliation:
Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama338-8570, Japan
Kosuke Nagashio
Affiliation:
Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo113-8656, Japan PRESTO, Japan Science and Technology Agency (JST), Tokyo113-8656, Japan
*
*(Email: higashitarumizu@ncd.t.u-tokyo.ac.jp)

Abstract

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Mechanical exfoliation is performed to fabricate ultrathin SnS layers, and chemical/thermal stability of SnS layers is discussed in comparison with GeS, toward piezoelectric nanogenerator application. Both SnS and GeS are difficult to be exfoliated under 10 nm using tape exfoliation due to strong interlayer ionic bonding by lone pair electrons in Sn or Ge atoms. Au-mediated exfoliation enables to fabricate larger-scale ultrathin SnS and GeS layers thinner than 10 nm owing to strong semi-covalent bonding between Au and S atoms, but GeS surface immediately degrades during Au etching in an oxidative KI/I2 solution. Although the surface of SnS after the Au-mediated exfoliation reveals several-nm oxide layer of SnOx, the surface morphology retains the flatness unlike the case of GeS. The SnS layers are more robust than GeS against the thermal annealing as well as the chemical treatment, suggesting that SnOx works as a passivation layer for SnS. Self-passivated SnS monolayer can be obtained by a controlled post-oxidation.

Keywords

2D materialsoxidationpiezoelectric
Type
Articles
Information
MRS Advances , Volume 3 , Issue 45-46: Nanomaterials , 2018 , pp. 2809 - 2814
Copyright
Copyright © Materials Research Society 2018 

References

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