Graphene encapsulation enabled high-throughput atom probe tomography of liquid specimens

Qiu, Shi, Garg, Vivek, Zhang, Shuo, Chen, Yu, Li, Jian, Taylor, Adam, Marceau, Ross K. W. and Fu, Jing 2020, Graphene encapsulation enabled high-throughput atom probe tomography of liquid specimens, Ultramicroscopy, vol. 216, pp. 1-7, doi: 10.1016/j.ultramic.2020.113036.

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Title Graphene encapsulation enabled high-throughput atom probe tomography of liquid specimens
Author(s) Qiu, Shi
Garg, Vivek
Zhang, Shuo
Chen, Yu
Li, Jian
Taylor, Adam
Marceau, Ross K. W.ORCID iD for Marceau, Ross K. W.
Fu, Jing
Journal name Ultramicroscopy
Volume number 216
Article ID 113036
Start page 1
End page 7
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2020-09
ISSN 0304-3991
Keyword(s) Atom probe tomography
Graphene encapsulation
Liquid specimen
High-throughput imaging
Summary A new method for imaging liquid specimens with atom probe tomography (APT) is proposed by introducing graphene encapsulation. By tuning the encapsulation speed and the number of encapsulations, controllable volumes of liquid can be encapsulated on a pre-sharpened specimen tip, with the end radius less than 75 nm to allow field ionization and evaporation. Encapsulation of liquid has been confirmed by using various characterization techniques, including electron microscopy and stimulated emission depletion microscopy. The graphene-encapsulated liquid specimen was then directly frozen at the cryogenic stage inside the atom probe instrument, followed by APT imaging in laser-pulsed mode. Using water as a test example, water-related ions have been identified in the acquired mass spectrum, which are spatially correlated to a reconstructed three-dimensional volume of water on top of the base specimen tip, as clearly revealed in the chemical maps. In addition, the proposed method has also been shown to produce multiple liquid specimens simultaneously on a pre-sharpened silicon micro-tip array for high-throughput APT imaging of liquid specimens. It is expected that the proposed lift-out-free method for preparing APT specimens in their hydrated state will open a new avenue for obtaining insights into various materials at atomic resolution.
Language eng
DOI 10.1016/j.ultramic.2020.113036
Indigenous content off
Field of Research 0205 Optical Physics
0299 Other Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2020, Elsevier B.V.
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Document type: Journal Article
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