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Fully alloyed metal nanorods with highly tunable properties
Wiebke Albrecht1, Jessi E S van der Hoeven2, Tian-Song Deng1
1Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. W.Albrecht@uu.nl A.vanBlaaderen@uu.nl.
Nanoscale
|February 8, 2017
Summary
Researchers developed a method to create stable alloyed metal nanorods, preserving their shape and enhancing optical and thermal properties. This technique prevents shape change during alloying, improving chemical stability and plasmonic performance.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Alloyed metal nanorods possess tunable plasmonic and photothermal properties.
- Controlling shape and stability during alloy formation is challenging.
Purpose of the Study:
- To achieve fully alloyed anisotropic nanoparticles with shape retention.
- To enhance the stability and plasmonic properties of core-shell nanorods.
Main Methods:
- Coating gold-silver, gold-palladium, and gold-platinum core-shell nanorods with a mesoporous silica shell.
- Employing low-temperature thermal treatment for alloying.
- Utilizing Mie-Gans and finite-difference time-domain (FDTD) calculations.
Main Results:
- Complete retention of nanorod shape during alloying was achieved.
- Alloyed gold-silver nanorods showed increased chemical stability and improved plasmonic properties.
- Alloyed gold-palladium and gold-platinum nanorods exhibited significantly enhanced thermal stability.
Conclusions:
- A novel method enables the synthesis of stable, alloyed anisotropic nanoparticles.
- Silica coating effectively preserves nanorod morphology during alloying.
- The resulting alloyed nanorods demonstrate superior chemical and thermal stability, with enhanced plasmonic performance.
