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Gold Nanooctahedra with Tunable Size and Microfluidic-Induced 3D Assembly for Highly Uniform SERS-Active Supercrystals

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Université Bordeaux, Laboratoire du Futur, SOLVAY, CNRS, 178 avenue Schweitzer, F-33600 Pessac, France
Departamento de Química Física, Universidade de Vigo, Vigo 36310, Spain
Cite this: Chem. Mater. 2015, 27, 24, 8310–8317
Publication Date (Web):October 16, 2015
https://doi.org/10.1021/acs.chemmater.5b03620
Copyright © 2015 American Chemical Society

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    Abstract

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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 nm 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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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.chemmater.5b03620.

    • Figures showing the time evolution spectra of the Au(III) to Au(I) reduction. Additional TEM images of the different Au octahedral particles. Electrospray ionization mass spectrum of the reactant and the product. Vis–NIR spectra and TEM images of the particles synthesized in the presence of ascorbic acid and N-isopropylacrylamide. Vis–NIR spectra and TEM images of butenoic acid mediated overgrowth of pentatwinned gold nanorods. Normalized SERS spectra of 1-NAT obtained with 633, 785, and 830 cm–1 laser lines. (PDF)

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