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Issue 10, 2018
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Electron microscopy of polyoxometalate ions on graphene by electrospray ion beam deposition

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Abstract

Aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) has enabled atomically resolved imaging of molecules adsorbed on low-dimensional materials like carbon nanotubes, graphene oxide and few-layer-graphene. However, conventional methods for depositing molecules onto such supports lack selectivity and specificity. Here, we describe the chemically selective preparation and deposition of molecules-like polyoxometalate (POM) anions [PW12O40]3− using electrospray ion-beam deposition (ES-IBD) along with high-resolution TEM imaging. This approach provides access to sub-monolayer coatings of intact molecules on freestanding graphene, which enables their atomically resolved ex situ characterization by low-voltage AC-HRTEM. The capability to tune the deposition parameters in either soft or reactive landing mode, combined with the well-defined high-vacuum deposition conditions, renders the ES-IBD based method advantageous over alternative methods such as drop-casting. Furthermore, it might be expanded towards depositing and imaging large and nonvolatile molecules with complex structures.

Graphical abstract: Electron microscopy of polyoxometalate ions on graphene by electrospray ion beam deposition

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Publication details

The article was received on 15 Jan 2018, accepted on 22 Feb 2018 and first published on 22 Feb 2018


Article type: Paper
DOI: 10.1039/C8NR00402A
Citation: Nanoscale, 2018,10, 4952-4961
  • Open access: Creative Commons BY license
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    Electron microscopy of polyoxometalate ions on graphene by electrospray ion beam deposition

    N. Vats, S. Rauschenbach, W. Sigle, S. Sen, S. Abb, A. Portz, M. Dürr, M. Burghard, P. A. van Aken and K. Kern, Nanoscale, 2018, 10, 4952
    DOI: 10.1039/C8NR00402A

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