CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM
Au-core, Au3Cu-alloyed shell nanoparticles passivated with CuS2 were fabricated by the polyol method, and characterized by Cs-corrected scanning transmission electron microscopy. The analysis of the high-resolution micrographs reveals that these nanoparticles have decahedral structure with shell per...
| Autores principales: | , , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | inglés |
| Publicado: |
2013
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| Acceso en línea: | http://eprints.uanl.mx/8914/1/CuS2%E2%80%90Passivated%20Au-Core%2C%20Au3Cu-Shell%20Nanoparticles%20Analyzed%20by%20Atomistic-Resolution%20Cs-Corrected%20STEM.pdf |
| _version_ | 1824370866159353856 |
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| author | Khanal, Subarna Casillas, Gilberto Bhattarai, Nabraj Velázquez Salazar, J. Jesús Santiago, Ulises Ponce, Arturo Mejía Rosales, Sergio Yacamán, Miguel José |
| author_facet | Khanal, Subarna Casillas, Gilberto Bhattarai, Nabraj Velázquez Salazar, J. Jesús Santiago, Ulises Ponce, Arturo Mejía Rosales, Sergio Yacamán, Miguel José |
| author_sort | Khanal, Subarna |
| collection | Repositorio Institucional |
| description | Au-core, Au3Cu-alloyed shell nanoparticles passivated with CuS2 were fabricated by the polyol method, and characterized by Cs-corrected scanning transmission electron microscopy. The analysis of the high-resolution micrographs reveals that these nanoparticles have decahedral structure with shell periodicity, and that each of the particles is composed by Au core and Au3Cu alloyed shell surrounded by CuS2 surface layer. X-ray diffraction measurements and results from numerical simulations confirm these findings. From the atomic resolution micrographs, we identified edge dislocations at the twin boundaries of the particles, as well as evidence of the diffusion of Cu atoms into the Au region, and the reordering of the lattice on the surface, close to the vertices of the particle. These defects will impact the atomic and electronic structures, thereby changing the physical and chemical properties of the nanoparticles. On the other hand, we show for the first time the formation of an ordered superlattice of Au3Cu and a self-capping layer made using one of the alloy metals. This has significant consequences on the physical mechanism that form multicomponent nanoparticles. |
| format | Article |
| id | eprints-8914 |
| institution | UANL |
| language | English |
| publishDate | 2013 |
| record_format | eprints |
| spelling | eprints-89142016-02-22T22:48:35Z http://eprints.uanl.mx/8914/ CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM Khanal, Subarna Casillas, Gilberto Bhattarai, Nabraj Velázquez Salazar, J. Jesús Santiago, Ulises Ponce, Arturo Mejía Rosales, Sergio Yacamán, Miguel José Q Ciencias en General QC Física Au-core, Au3Cu-alloyed shell nanoparticles passivated with CuS2 were fabricated by the polyol method, and characterized by Cs-corrected scanning transmission electron microscopy. The analysis of the high-resolution micrographs reveals that these nanoparticles have decahedral structure with shell periodicity, and that each of the particles is composed by Au core and Au3Cu alloyed shell surrounded by CuS2 surface layer. X-ray diffraction measurements and results from numerical simulations confirm these findings. From the atomic resolution micrographs, we identified edge dislocations at the twin boundaries of the particles, as well as evidence of the diffusion of Cu atoms into the Au region, and the reordering of the lattice on the surface, close to the vertices of the particle. These defects will impact the atomic and electronic structures, thereby changing the physical and chemical properties of the nanoparticles. On the other hand, we show for the first time the formation of an ordered superlattice of Au3Cu and a self-capping layer made using one of the alloy metals. This has significant consequences on the physical mechanism that form multicomponent nanoparticles. 2013 Article PeerReviewed text en cc_by_nc_nd http://eprints.uanl.mx/8914/1/CuS2%E2%80%90Passivated%20Au-Core%2C%20Au3Cu-Shell%20Nanoparticles%20Analyzed%20by%20Atomistic-Resolution%20Cs-Corrected%20STEM.pdf http://eprints.uanl.mx/8914/1.haspreviewThumbnailVersion/CuS2%E2%80%90Passivated%20Au-Core%2C%20Au3Cu-Shell%20Nanoparticles%20Analyzed%20by%20Atomistic-Resolution%20Cs-Corrected%20STEM.pdf Khanal, Subarna y Casillas, Gilberto y Bhattarai, Nabraj y Velázquez Salazar, J. Jesús y Santiago, Ulises y Ponce, Arturo y Mejía Rosales, Sergio y Yacamán, Miguel José (2013) CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM. Langmuir, 29. pp. 9231-9239. ISSN 0743-7463 |
| spellingShingle | Q Ciencias en General QC Física Khanal, Subarna Casillas, Gilberto Bhattarai, Nabraj Velázquez Salazar, J. Jesús Santiago, Ulises Ponce, Arturo Mejía Rosales, Sergio Yacamán, Miguel José CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| thumbnail | https://rediab.uanl.mx/themes/sandal5/images/online.png |
| title | CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| title_full | CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| title_fullStr | CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| title_full_unstemmed | CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| title_short | CuS2‐Passivated Au-Core, Au3Cu-Shell nanoparticles analyzed by Atomistic-Resolution Cs-Corrected STEM |
| title_sort | cus2 passivated au core au3cu shell nanoparticles analyzed by atomistic resolution cs corrected stem |
| topic | Q Ciencias en General QC Física |
| url | http://eprints.uanl.mx/8914/1/CuS2%E2%80%90Passivated%20Au-Core%2C%20Au3Cu-Shell%20Nanoparticles%20Analyzed%20by%20Atomistic-Resolution%20Cs-Corrected%20STEM.pdf |
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