Four-Dimensional Probing of Phase-Reaction Dynamics in Au/GaAs Nanowires
[1];
[2];
- Shanghai Jiao Tong Univ. (China). Center for Ultrafast Science and Technology. School of Chemistry and Chemical Engineering
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics & Materials Science Dept.
- Australian National Univ., Canberra, ACT (Australia). Australian National Fabrication Facility. Research School of Physics and Engineering
- Australian National Univ., Canberra, ACT (Australia). Dept. of Electronic Materials Engineering. Research School of Physics and Engineering
Nanoeutectic phase reaction covers the fundamental study of a chemical and physical reaction of multiple phases at the nanoscale. 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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Australian National Univ., Canberra, ACT (Australia); Shanghai Jiao Tong Univ. (China)
- Sponsoring Organization:
- USDOE; Australian Research Council; Shanghai Pujiang Program (China)
- Grant/Contract Number:
- SC0012704; 18PJ1405900
- OSTI ID:
- 1504403
- Report Number(s):
- BNL-211476-2019-JAAM
- Journal Information:
- Nano Letters, Vol. 19, Issue 2; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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