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Single-crystalline gold microplates: synthesis, characterization, and thermal stability
Caixia Kan1, Xiaoguang Zhu, Guanghou Wang
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, PR China. cxkan@nju.edu.cn
The Journal of Physical Chemistry. B
|March 11, 2006
Summary
Synthesized large quantities of single-crystalline gold microplates with unique shapes and remarkable optical properties. These gold nanostructures are not stable at high temperatures, fragmenting above 450°C.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Anisotropic gold nanostructures offer unique optical properties.
- Controlling shape and size is crucial for tailored applications.
- Understanding thermal stability is vital for high-temperature applications.
Purpose of the Study:
- To synthesize single-crystalline gold microplates in large quantities.
- To characterize their optical properties and thermal stability.
- To investigate their behavior at elevated temperatures.
Main Methods:
- Solution phase synthesis of gold microplates.
- Characterization of morphology, crystal structure, and optical properties.
- Thermal analysis to determine stability limits.
Main Results:
- Successfully synthesized gold microplates (10 microm) with hexagonal, truncated triangular, and triangular shapes.
- Observed dipole plasmon resonance in the NIR and quadrupole plasmon resonance at 820 nm.
- Identified fragmentation above 450°C, with melting initiating at edges (Au (110) facets).
Conclusions:
- Single-crystalline gold microplates with tunable optical properties were synthesized.
- The nanostructures exhibit limited thermal stability, fragmenting above 450°C.
- Findings are valuable for applications of gold nanostructures at elevated temperatures.