Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 24, Pages 8310-8317Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03620
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Funding
- Spanish Ministerio de Economia y Competitividad [MAT2013-45168-R]
- Xunta de Galicia/FEDER [GPC2013-006]
- LabEx AMADEus in the framework of IdEx Bordeaux [ANR-10-LABX-42, ANR-10-IDEX-03-02]
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Shape-controlled synthesis of uniform noble metal nanoparticles (NPs) is crucial for the development of future plasmonic devices. The use of nanocrystals with well-defined morphologies and crystallinity as seed particles is expected to provide excellent shape control and monodispersity. We report the aqueous-based seed-mediated growth of monodisperse gold octahedra with wide range of sizes (50-150 mn in side length) by reducing different amounts of HAuCl4 on preformed single crystalline gold nanorods using butenoic acid as reducing agent. Butenoic acid plays a key role as a mild reducing agent as well as favoring the thermodynamic control of the reaction. The uniformity of the as-prepared Au octahedra combined with the use of a microfluidic technique based on microevaporation will allow the self-assembly of octahedra into uniform 3D supercrystals. Additionally, these plasmonic substrates exhibit high and uniform SERS signals over extended areas with intensities increasing with the Au nanoparticle size.
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