Graphene microcapsule arrays for combinatorial electron microscopy and spectroscopy in liquids
Alexander Yulaev, Hongxuan Guo, Evgheni Strelcov, Lei Chen, Ivan Vlasssiouk, Andrei A. Kolmakov
An atomic-scale thickness, molecular impermeability, low atomic number, and mechanical strength make graphene an ideal electron transparent membrane for scanning electron microscopy and spectroscopy in liquids. Here, we present a novel sample platform made of an array of thousands of identical isolated graphene-capped micro-channels with high aspect ratio. A combination of the global wide field of view with local imaging of a microchannel array allows for high throughput screening of liquid samples. We demonstrate the capabilities of this platform studying a pure water, a model electrochemical plating process and a beam induced crystal growth in liquid electrolyte solutions. The spectroscopic capabilities such as Auger and X-ray fluorescence analysis of liquids and immersed objects through the graphene membrane have been demonstrated
, Guo, H.
, Strelcov, E.
, Chen, L.
, Vlasssiouk, I.
and Kolmakov, A.
Graphene microcapsule arrays for combinatorial electron microscopy and spectroscopy in liquids, ACS Applied Materials and Interfaces, [online], https://doi.org/10.1021/acsami.7b02824
(Accessed July 31, 2021)