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Structural and Optical Properties of Discrete Dendritic Pt Nanoparticles on Colloidal Au Nanoprisms
- Source :
- The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
- Publication Year :
- 2016
- Publisher :
- American Chemical Society (ACS), 2016.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 120
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi.dedup.....bffaf3904c1a7f76154129c2d643e5cd