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Observing Electrochemical Dealloying by Single-Nanoparticle Collision
- Source :
- Analytical Chemistry. 88:8728-8734
- Publication Year :
- 2016
- Publisher :
- American Chemical Society (ACS), 2016.
-
Abstract
- We report direct observation of electrochemical and thermal dealloying processes of individual metal alloy nanoparticles (NPs). Electrochemical dealloying of single Ag-Hg alloy NPs was achieved in a basic solution (e.g., pH 13) by oxidizing Hg under controlled potentials. Ag can also be oxidized during single-particle collision. However, it requires elevated potentials. The strong basic environment promoted the formation of metal oxides during collision leading to a unique core-shell type nanostructure which was further confirmed by transmission electron microscopy (TEM). In thermal dealloying, Hg was evaporated due to the use of a high-energy electron beam and the process was imaged in situ inside a TEM. Both electrochemical and thermal dealloying processes resulted in the transformation of an amorphous NP to a more stable Ag-Hg alloy nanocrystal. This work demonstrates that NP collision can be a useful tool to study dealloying processes of various nanomaterials at a single-particle level.
- Subjects :
- Nanostructure
Chemistry
Alloy
Nanoparticle
Nanotechnology
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Analytical Chemistry
Nanomaterials
Amorphous solid
Nanocrystal
Transmission electron microscopy
Basic solution
engineering
0210 nano-technology
Subjects
Details
- ISSN :
- 15206882 and 00032700
- Volume :
- 88
- Database :
- OpenAIRE
- Journal :
- Analytical Chemistry
- Accession number :
- edsair.doi.dedup.....19eb57edf766e4bd1ccb5bd5b2702584