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Concave Gold Nanocubes Exhibit Growth-Etching Behavior: Unexpected Morphological Transformations
Hongmei Luo1, Min Ouyang1, Hongchen Li1
1National Engineering Laboratory for Rice and Byproducts Further Processing, Central South University of Forestry & Technology, Changsha 410004, China.
Inorganic Chemistry
|June 28, 2024
Summary
Concave gold nanocubes (CGNs) undergo dynamic etching and growth in alkaline solutions, altering their shape and size. This controlled transformation yields carpenterworm-like gold nanoparticles with enhanced catalytic activity for p-nitrophenol reduction.
Area of Science:
- Nanomaterials Science
- Physical Chemistry
- Catalysis
Background:
- Chemical equilibrium is complex for nanomaterials due to unique properties.
- Concave gold nanocubes (CGNs) exhibit dynamic behavior in alkaline solutions.
Purpose of the Study:
- Investigate the etching and growth of CGNs in alkaline Au3+/H2O2 solutions.
- Characterize morphological and dimensional changes.
- Evaluate the catalytic performance of resulting nanoparticles.
Main Methods:
- Transmission electron microscopy (TEM) for morphology analysis.
- Ultraviolet-visible spectroscopy for real-time monitoring.
- Time-dependent TEM to observe dynamic changes.
Main Results:
- CGNs dimensions varied from 107 nm to 199 nm and then to 125 nm.
- Morphology changed from concave to multibranch and back to concave.
- Carpenterworm-like gold nanoparticles showed superior catalytic activity in p-nitrophenol reduction.
Conclusions:
- Dynamic etching and growth processes influence CGN properties.
- Nanoparticle morphology and surface defects enhance catalytic efficiency.
- Ostwald ripening effect contributes to etching in alkaline solutions.
