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Imaging the structure, symmetry, and surface-inhibited rotation of polyoxometalate ions on graphene oxide
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Sloan, Jeremy, Liu, Zheng, Suenaga, Kazu, Wilson, Neil R., Pandey, Priyanka A., Perkins, Laura M., Rourke, Jonathan P. and Shannon, Ian J.. (2010) Imaging the structure, symmetry, and surface-inhibited rotation of polyoxometalate ions on graphene oxide. Nano Letters, Vol.10 (No.11). pp. 4600-4606. ISSN 1530-6984
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Official URL: http://dx.doi.org/10.1021/nl1026452
Abstract
Atomic-resolution imaging of discrete [gamma-SiW10O36](8-) lacunary Keggin ions dispersed MO monolayer graphene oxide (GO) films by low voltage aberration corrected transmission electron microscopy is described. Under low electron beam dose, individual anions remain stationary for long enough that a variety of projections can be observed and structural information extracted with ca. +/- 0.03 nm precision. Unambiguous assignment of the orientation of individual ions with respect to the point symmetry elements can be determined. The C-2 gamma symmetry [gamma-SiW10O36](8-) ion was imaged along its 2-fold C-2 axis or orthogonally with respect to one of two nonequivalent mirror planes (i.e., sigma(nu)). Continued electron beam exposure of a second ion imaged orthogonal to sigma(nu) causes it to translate and/or rotate in an inhibited fashion so that the ion can be viewed in different relative orientations. The inhibited surface motion of the anion, which is in response to H-bonding-type interactions, reveals an important new property for GO in that it demonstrably behaves as a chemically modified (i.e., rather than chemically neutral) surface in electron microscopy. This behavior indicates that GO has more in common with substrates used in imaging techniques such as atomic force microscopy and scanning tunneling microscopy, and this clearly sets it apart From other support films used in transmission electron microscopy.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Science > Chemistry Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Graphene, Polyoxometalates, Surface chemistry, Electron microscopy |
| Journal or Publication Title: | Nano Letters |
| Publisher: | American Chemical Society |
| ISSN: | 1530-6984 |
| Date: | November 2010 |
| Volume: | Vol.10 |
| Number: | No.11 |
| Number of Pages: | 7 |
| Page Range: | pp. 4600-4606 |
| Identification Number: | 10.1021/nl1026452 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Sangyō Gijutsu Sōgō Kenkyūjo [National Institute of Advanced Industrial Science and Technology (Japan)], Royal Society (Great Britain) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/4838 |
Data sourced from Thomson Reuters' Web of Knowledge
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