Nanohalos: a manifestation of electron channelling in gold nanoparticles.
We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (hal...
| Автори: | , , , , |
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| Формат: | Journal article |
| Мова: | English |
| Опубліковано: |
2012
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| _version_ | 1826269421299040256 |
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| author | Ruben, G Wang, P D'Alfonso, A Nellist, P Allen, L |
| author_facet | Ruben, G Wang, P D'Alfonso, A Nellist, P Allen, L |
| author_sort | Ruben, G |
| collection | OXFORD |
| description | We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging. |
| first_indexed | 2024-03-06T21:24:47Z |
| format | Journal article |
| id | oxford-uuid:42b94fdd-6b16-4e77-8ae7-a3d27ebbceb3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:24:47Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:42b94fdd-6b16-4e77-8ae7-a3d27ebbceb32022-03-26T14:51:10ZNanohalos: a manifestation of electron channelling in gold nanoparticles.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:42b94fdd-6b16-4e77-8ae7-a3d27ebbceb3EnglishSymplectic Elements at Oxford2012Ruben, GWang, PD'Alfonso, ANellist, PAllen, LWe discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging. |
| spellingShingle | Ruben, G Wang, P D'Alfonso, A Nellist, P Allen, L Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title | Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title_full | Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title_fullStr | Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title_full_unstemmed | Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title_short | Nanohalos: a manifestation of electron channelling in gold nanoparticles. |
| title_sort | nanohalos a manifestation of electron channelling in gold nanoparticles |
| work_keys_str_mv | AT rubeng nanohalosamanifestationofelectronchannellingingoldnanoparticles AT wangp nanohalosamanifestationofelectronchannellingingoldnanoparticles AT dalfonsoa nanohalosamanifestationofelectronchannellingingoldnanoparticles AT nellistp nanohalosamanifestationofelectronchannellingingoldnanoparticles AT allenl nanohalosamanifestationofelectronchannellingingoldnanoparticles |