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Ag dendrite-based Au/Ag bimetallic nanostructures with strongly enhanced catalytic activity
Jianfeng Huang1, Sascha Vongehr, Shaochun Tang
1National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 1, 2009
Summary
Silver-gold (Ag/Au) bimetallic nanostructures were synthesized using a galvanic replacement reaction. These porous nanostructures show enhanced catalytic activity for 4-nitrophenol reduction.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Dendritic nanostructures offer unique properties for catalysis.
- Galvanic replacement reactions (GRR) are effective for synthesizing bimetallic nanomaterials.
Purpose of the Study:
- To synthesize silver-gold (Ag/Au) bimetallic nanostructures.
- To investigate the morphological and structural evolution during synthesis.
- To evaluate their catalytic performance.
Main Methods:
- Galvanic replacement reaction (GRR) of silver dendrites in chlorauric acid (HAuCl4).
- Characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), and X-ray diffraction.
- Surface-enhanced Raman scattering (SERS) to confirm the formation mechanism.
- Catalytic reduction of 4-nitrophenol (4-NP) using sodium borohydride (NaBH4).
Main Results:
- Successfully synthesized Ag/Au bimetallic nanostructures with tunable porosity.
- Observed morphological changes from dendritic Ag to porous Ag/Au structures with Au flakes.
- Confirmed Ag replacement by Au using TEM, EDX, and selected area electron diffraction.
- Demonstrated enhanced catalytic activity in the reduction of 4-nitrophenol.
Conclusions:
- The galvanic replacement reaction provides a route to porous Ag/Au nanostructures.
- These nanostructures exhibit significantly enhanced catalytic efficiency.
- The findings suggest potential applications in catalysis.
