Dynamics and control of gold-encapped gallium arsenide nanowires imaged by 4D electron microscopy
Abstract
Imaging chemical/physical reaction dynamics at nanoscale interfaces of a composite nanostructure requires resolutions in both space and time. Using single-pulse methodology, we directly and visually capture the irreversible eutectic-related phase reactions of a single, same metal/semiconductor nanowire at nanometer–nanosecond spatiotemporal resolution by 4D electron microscopy. With a nondestructive free-standing sample preparation free from environmental disturbance that is important for statistical investigation, we have both qualitatively and quantitatively elucidated the transient phase reactions and obtained important physical properties of the newly formed phases, such as latent heat and specific heat. Our work provides an efficient way of quantitatively determining physical properties of a nanoscale object with a tiny small quantity, especially when not available in bulk counterparts.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 20, 2017
- Source ID
- 10.1073/pnas.1708761114
Entities
People
- Ahmed Zewail
- Bin Chen
- Chennupati Jagadish
- Hark Hoe Tan
- Jau Tang
- Mykhaylo Lysevych
- Xuewen Fu
Organizations
- Air Force Office of Scientific Research
- Australian National University
- California Institute of Technology