Structural and Optical Properties of Discrete Dendritic Pt Nanoparticles on Colloidal Au Nanoprisms
| Autor: | Paul A. Midgley, Emilie Ringe, Patrick J. Straney, Sean M. Collins, Jill E. Millstone, Rafal E. Dunin-Borkowski, Rowan K. Leary, Sadegh Yazdi, Anjli Kumar |
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| Přispěvatelé: | Collins, Sean [0000-0002-5151-6360], Midgley, Paul [0000-0002-6817-458X], Ringe, Emilie [0000-0003-3743-9204], Apollo - University of Cambridge Repository |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Morphology (linguistics) 0299 Other Physical Sciences Nanotechnology 02 engineering and technology Electron 010402 general chemistry 01 natural sciences Article law.invention law Physical and Theoretical Chemistry Spectroscopy Nanoscopic scale 0306 Physical Chemistry (incl. Structural) 1007 Nanotechnology 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Electron tomography Pt nanoparticles Electron microscope 0210 nano-technology Localized surface plasmon |
| Zdroj: | The Journal of Physical Chemistry. C, Nanomaterials and Interfaces |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b02103 |
| Popis: | Catalytic and optical properties can be coupled by combining different metals into nanoscale architectures in which both the shape and the composition provide fine-tuning of functionality. Here, discrete, small Pt nanoparticles (diameter = 3-6 nm) were grown in linear arrays on Au nanoprisms, and the resulting structures are shown to retain strong localized surface plasmon resonances. Multidimensional electron microscopy and spectroscopy techniques (energy-dispersive X-ray spectroscopy, electron tomography, and electron energy-loss spectroscopy) were used to unravel their local composition, three-dimensional morphology, growth patterns, and optical properties. The composition and tomographic analyses disclose otherwise ambiguous details of the Pt-decorated Au nanoprisms, revealing that both pseudospherical protrusions and dendritic Pt nanoparticles grow on all faces of the nanoprisms (the faceted or occasionally twisted morphologies of which are also revealed), and shed light on the alignment of the Pt nanoparticles. The electron energy-loss spectroscopy investigations show that the Au nanoprisms support multiple localized surface plasmon resonances despite the presence of pendant Pt nanoparticles. The plasmonic fields at the surface of the nanoprisms indeed extend into the Pt nanoparticles, opening possibilities for combined optical and catalytic applications. These insights pave the way toward comprehensive nanoengineering of multifunctional bimetallic nanostructures, with potential applications in plasmon-enhanced catalysis and in situ monitoring of chemical processes via surface-enhanced spectroscopy. |
| Databáze: | OpenAIRE |
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