| DOI | Trouver le DOI : https://doi.org/10.1088/1367-2630/13/6/063011 |
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| Auteur | Rechercher : Mutus, J.Y.1; Rechercher : Livadaru, L.1; Rechercher : Robinson, J.T.; Rechercher : Urban, R.1; Rechercher : Salomons, M.H.1; Rechercher : Cloutier, M.1; Rechercher : Wolkow, R.A.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut national de nanotechnologie
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| Format | Texte, Article |
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| Sujet | covalent radii; electron emitters; electron transmission; image objects; knife edge; low energies; low energy electrons; microscope slide; nano-scale objects; point projection; strong field; virtual sources; electron beams; electron holography; electrons; graphene |
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| Résumé | Point projection microscopy (PPM) is used to image suspended graphene by using low-energy electrons (100-205 eV). Because of the low energies used, the graphene is neither damaged nor contaminated by the electron beam for doses of the order of 107 electrons per nm2. The transparency of graphene is measured to be 74%, equivalent to electron transmission through a sheet twice as thick as the covalent radius of sp2-bonded carbon. Also observed is rippling in the structure of the suspended graphene, with a wavelength of approximately 26 nm. The interference of the electron beam due to diffraction off the edge of a graphene knife edge is observed and is used to calculate a virtual source size of 4.7 ± 0.6 Å for the electron emitter. It is demonstrated that graphene can serve as both the anode and the substrate in PPM, thereby avoiding distortions due to strong field gradients around nanoscale objects. Graphene can be used to image objects suspended on the sheet using PPM and, in the future, electron holography. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. |
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| Date de publication | 2011 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21271410 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 2eabda7f-a7ca-42c8-8856-74bdf2ca315e |
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| Enregistrement créé | 2014-03-24 |
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| Enregistrement modifié | 2020-04-21 |
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