Four-Dimensional Probing of Phase-Reaction Dynamics in Au/GaAs Nanowires
| العنوان: | Four-Dimensional Probing of Phase-Reaction Dynamics in Au/GaAs Nanowires |
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| المؤلفون: | Mykhaylo Lysevych, Bin Chen, Chennupati Jagadish, Hark Hoe Tan, Xuewen Fu |
| المصدر: | Nano Letters. 19:781-786 |
| بيانات النشر: | American Chemical Society (ACS), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Phase reaction, Materials science, Mechanical Engineering, Nanowire, Bioengineering, 02 engineering and technology, General Chemistry, Laser pumping, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Molecular physics, Pulse (physics), law.invention, law, Phase (matter), General Materials Science, Electron microscope, 0210 nano-technology, Nanoscopic scale, Wurtzite crystal structure |
| الوصف: | Nanoeutectic phase reaction covers the fundamental study of a chemical and physical reaction of multiple phases at the nanoscale. Here, we report the direct visualization of phase-reaction dynamics in Au/GaAs nanowires (NWs) using four-dimensional (4D) electron microscopy. The NW phase reactions were initiated with a pump laser pulse, while the following dynamics in the Au/GaAs NW was probed by a precisely time-delayed electron pulse. Single-pulse imaging reveals that the cubic zinc-blende NW presents a transient length increase within the time duration of ∼150 ns, giving the appearance of intermediate phase reactions at an early stage. A final length reduction of the NW is observed after the phase reactions have fully ended. In contrast, only length reduction is seen throughout the entire process in GaAs/AlGaAs core-shell and hexagonal wurtzite GaAs NWs. The reasons for the above intriguing phenomena are discussed. The eutectic-related phenomena in both zinc-blende and wurtzite materials offer a comprehensive understanding of phase-reaction dynamics in polytypic structures commonly available in compound semiconductors. |
| تدمد: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.8b03870 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b2618f1635b07010230d1682679e39c https://doi.org/10.1021/acs.nanolett.8b03870 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....5b2618f1635b07010230d1682679e39c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15306992 15306984 |
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| DOI: | 10.1021/acs.nanolett.8b03870 |