MoS 2 Liquid Cell Electron Microscopy Through Clean and Fast Polymer-Free MoS 2 Transfer

Jiwoong Yang, Moon Kee Choi, Yuewen Sheng, Jaebong Jung, Karen Bustillo, Tongxin Chen, Seung Wuk Lee, Peter Ercius, Ji Hoon Kim, Jamie H. Warner, Emory M. Chan, Haimei Zheng

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Two dimensional (2D) materials have found various applications because of their unique physical properties. For example, graphene has been used as the electron transparent membrane for liquid cell transmission electron microscopy (TEM) due to its high mechanical strength and flexibility, single-atom thickness, chemical inertness, etc. Here, we report using 2D MoS 2 as a functional substrate as well as the membrane window for liquid cell TEM, which is enabled by our facile and polymer-free MoS 2 transfer process. This provides the opportunity to investigate the growth of Pt nanocrystals on MoS 2 substrates, which elucidates the formation mechanisms of such heterostructured 2D materials. We find that Pt nanocrystals formed in MoS 2 liquid cells have a strong tendency to align their crystal lattice with that of MoS 2 , suggesting a van der Waals epitaxial relationship. Importantly, we can study its impact on the kinetics of the nanocrystal formation. The development of MoS 2 liquid cells will allow further study of various liquid phenomena on MoS 2 , and the polymer-free MoS 2 transfer process will be implemented in a wide range of applications.

Original languageEnglish
Pages (from-to)1788-1795
Number of pages8
JournalNano Letters
Volume19
Issue number3
DOIs
StatePublished - 13 Mar 2019

Bibliographical note

Publisher Copyright:
© Copyright 2019 American Chemical Society.

Keywords

  • Liquid cell electron microscopy
  • MoS
  • heterostructures
  • nanocrystal formation
  • polymer-free transfer

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