Understanding the true shape of Au-catalyzed GaAs nanowires.
With increasing interest in nanowire-based devices, a thorough understanding of the nanowire shape is required to gain tight control of the quality of nanowire heterostructures and improve the performance of related devices. We present a systematic study of the sidewalls of Au-catalyzed GaAs nanowir...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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American Chemical Society
2014
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| _version_ | 1797072812488261632 |
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| author | Jiang, N Wong-Leung, J Joyce, H Gao, Q Tan, H Jagadish, C |
| author_facet | Jiang, N Wong-Leung, J Joyce, H Gao, Q Tan, H Jagadish, C |
| author_sort | Jiang, N |
| collection | OXFORD |
| description | With increasing interest in nanowire-based devices, a thorough understanding of the nanowire shape is required to gain tight control of the quality of nanowire heterostructures and improve the performance of related devices. We present a systematic study of the sidewalls of Au-catalyzed GaAs nanowires by investigating the faceting process from the beginning with vapor-liquid-solid (VLS) nucleation, followed by the simultaneous radial growth on the sidewalls, and to the end with sidewall transformation during annealing. The VLS nucleation interface of our GaAs nanowires is revealed by examining cross sections of the nanowire, where the nanowire exhibits a Reuleaux triangular shape with three curved surfaces along {112}A. These curved surfaces are not thermodynamically stable and adopt {112}A facets during radial growth. We observe clear differences in radial growth rate between the ⟨112⟩A and ⟨112⟩B directions with {112}B facets forming due to the slower radial growth rate along ⟨112⟩B directions. These sidewalls transform to {110} facets after high temperature (>500 °C) annealing. A nucleation model is proposed to explain the origin of the Reuleaux triangular shape of the nanowires, and the sidewall evolution is explained by surface kinetic and thermodynamic limitations. |
| first_indexed | 2024-03-06T23:13:03Z |
| format | Journal article |
| id | oxford-uuid:6629de0a-0210-417f-a1ad-a00e51453fa4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:13:03Z |
| publishDate | 2014 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:6629de0a-0210-417f-a1ad-a00e51453fa42022-03-26T18:30:07ZUnderstanding the true shape of Au-catalyzed GaAs nanowires.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6629de0a-0210-417f-a1ad-a00e51453fa4EnglishSymplectic Elements at OxfordAmerican Chemical Society2014Jiang, NWong-Leung, JJoyce, HGao, QTan, HJagadish, CWith increasing interest in nanowire-based devices, a thorough understanding of the nanowire shape is required to gain tight control of the quality of nanowire heterostructures and improve the performance of related devices. We present a systematic study of the sidewalls of Au-catalyzed GaAs nanowires by investigating the faceting process from the beginning with vapor-liquid-solid (VLS) nucleation, followed by the simultaneous radial growth on the sidewalls, and to the end with sidewall transformation during annealing. The VLS nucleation interface of our GaAs nanowires is revealed by examining cross sections of the nanowire, where the nanowire exhibits a Reuleaux triangular shape with three curved surfaces along {112}A. These curved surfaces are not thermodynamically stable and adopt {112}A facets during radial growth. We observe clear differences in radial growth rate between the ⟨112⟩A and ⟨112⟩B directions with {112}B facets forming due to the slower radial growth rate along ⟨112⟩B directions. These sidewalls transform to {110} facets after high temperature (>500 °C) annealing. A nucleation model is proposed to explain the origin of the Reuleaux triangular shape of the nanowires, and the sidewall evolution is explained by surface kinetic and thermodynamic limitations. |
| spellingShingle | Jiang, N Wong-Leung, J Joyce, H Gao, Q Tan, H Jagadish, C Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title | Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title_full | Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title_fullStr | Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title_full_unstemmed | Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title_short | Understanding the true shape of Au-catalyzed GaAs nanowires. |
| title_sort | understanding the true shape of au catalyzed gaas nanowires |
| work_keys_str_mv | AT jiangn understandingthetrueshapeofaucatalyzedgaasnanowires AT wongleungj understandingthetrueshapeofaucatalyzedgaasnanowires AT joyceh understandingthetrueshapeofaucatalyzedgaasnanowires AT gaoq understandingthetrueshapeofaucatalyzedgaasnanowires AT tanh understandingthetrueshapeofaucatalyzedgaasnanowires AT jagadishc understandingthetrueshapeofaucatalyzedgaasnanowires |