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Synthesis and Alignment of Silver Nanorods and Nanowires and the Formation of Pt, Pd, and Core/Shell Structures by Galvanic Exchange Directly on Surfaces

2007; American Chemical Society; Volume: 23; Issue: 20 Linguagem: Inglês

10.1021/la701606p

1520-5827

Grzegorz Sławiński, Francis P. Zamborini,

Gold and Silver Nanoparticles Synthesis and Applications

Here we describe the synthesis of Ag nanorods (NRs) (aspect ratio 300, and the average diameter is approximately 35 nm. Approximately 40% of the 1D structures are NRs, and 60% are NWs as defined by their ARs. We also report the alignment of Ag NRs/NWs directly on surfaces by growing the structures on amine-functionalized Si(100) surfaces after an amidation reaction with acetic acid and a method to improve the percentage of Ag NRs/NWs on the surface by removing structures of other shapes with adhesive tape. Surface-grown Ag NRs/NWs also react with salts of palladium, platinum, and gold via galvanic exchange reactions to form high-surface-area 1D structures of the corresponding metal. The combination of the seed-mediated growth of Ag on Au NRs followed by the galvanic exchange of Ag with Pd leads to interesting core/shell NRs grown directly on surfaces. We used scanning electron microscopy, UV−vis spectroscopy, and X-ray photoelectron spectroscopy to characterize the surface-grown nanostructures.