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Graphene-Sealed Flow Cells for In Situ Transmission Electron Microscopy of Liquid Samples. 2020

Gabriel Dunn, and Vivekananda P Adiga, and Thang Pham, and Christopher Bryant, and Donez J Horton-Bailey, and Jason N Belling, and Ben LaFrance, and Jonathan A Jackson, and Hamid Reza Barzegar, and Jong Min Yuk, and Shaul Aloni, and Michael F Crommie, and Alex Zettl
Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States.

We introduce a graphene-based nanofluidic cell that facilitates in situ imaging of liquid samples via transmission electron microscopy. The cell combines the benefits of graphene liquid cells-namely, high resolution, reduced charging effects, and excellent sample stability-with the ability to introduce reactants and control fluid concentrations as provided by conventional silicon-nitride-windowed flow cells. The graphene flow cell offers significantly less window bowing compared to existing commercial holders. We demonstrate the performance of the flow cell by imaging gold nanoparticle dynamics and uranyl acetate crystallization. Our results confirm the utility of graphene flow cells in obtaining the high spatial and temporal resolution required for probing the complex dynamics of nanoparticles and nucleation pathways in aqueous solutions.

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