Cathodoluminescence of small silver particles on Al2O3/NiAl (110)

Drachsel, W.; Adelt, Maik; Nilius, Niklas; Freund, Hans‐Joachim

doi:10.1016/s0368-2048(01)00361-9

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…21(c)]. Nevertheless, these phenomena are relevant to understand CL assisted by particle plasmons in metal clusters embedded in dielectrics (Drachsel et al, 2002;Karali et al, 2005).…”

Section: Incoherent Cathodoluminescencementioning

confidence: 99%

Optical excitations in electron microscopy

2010

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This review discusses how low-energy valence excitations created by swift electrons can render information on the optical response of structured materials with unmatched spatial resolution. Electron microscopes are capable of focusing electron beams on subnanometer spots and probing the target response either by analyzing electron energy losses or by detecting emitted radiation. Theoretical frameworks suited to calculate the probability of energy loss and light emission ͑cathodoluminescence͒ are reconsidered and compared with experimental results. More precisely, a quantum-mechanical description of the interaction between the electrons and the sample is discussed, followed by a powerful classical dielectric approach that can be applied in practice to more complex systems. The conditions are assessed under which classical and quantum-mechanical formulations are equivalent. The excitation of collective modes such as plasmons is studied in bulk materials, planar surfaces, and nanoparticles. Light emission induced by the electrons is shown to constitute an excellent probe of plasmons, combining subnanometer resolution in the position of the electron beam with nanometer resolution in the emitted wavelength. Both electron energy-loss and cathodoluminescence spectroscopies performed in a scanning mode of operation yield snapshots of plasmon modes in nanostructures with fine spatial detail as compared to other existing imaging techniques, thus providing an ideal tool for nanophotonics studies.

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“…21(c)]. Nevertheless, these phenomena are relevant to understand CL assisted by particle plasmons in metal clusters embedded in dielectrics (Drachsel et al, 2002;Karali et al, 2005).…”

Section: Incoherent Cathodoluminescencementioning

confidence: 99%

Optical excitations in electron microscopy

2010

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“…Compared to optical extinction spectroscopy, which probes the allowed electric dipole transitions, stimulation by electron impact also provides information on possible excitation channels not directly accessible by optical transitions. Cathodoluminescence was, for instance, employed to study the radiative deexcitation of Mie plasmons in Ag NPs on a thin alumina film on NiAl(110) . From analysis of these spectra it was concluded that the optical coupling between silver MNPs was of minor importance at island densities below ∼10 11 cm -2 .…”

Section: 32 Plasmon Lifetime and Decaymentioning

confidence: 99%

“…Cathodoluminescence was, for instance, employed to study the radiative deexcitation of Mie plasmons in Ag NPs on a thin alumina film on NiAl (110). 117 From analysis of these spectra it was concluded that the optical coupling between silver MNPs was of minor importance at island densities below ∼10 11 cm -2 . Spectral changes after annealing of the sample were also monitored and attributed to modifications in the shape and size of silver MNPs during annealing (Ostwald ripening and increasing aspect ratio).…”

Section: Plasmon Lifetime and Decaymentioning

confidence: 99%

Photochemistry on Metal Nanoparticles

et al. 2006

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“…The growth of Ag on NiAl(110) has previously been studied by a combination of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations, , which showed an initial bilayer growth and wetting of the NiAl(110) surface. The growth mode of Ag/Al 2 O 3 is, due to the low surface energy of the oxide, completely different, resulting in the formation of Ag nanoparticles. − …”

Section: Introductionmentioning

confidence: 99%

Toward a Silver–Alumina Model System for NO_x Reduction Catalysis

et al. 2014

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The growth and morphology of Ag deposited on NiAl(110) and on oxidized NiAl(110) have been investigated by a combination of scanning tunneling microscopy (STM) and high-resolution core-level spectroscopy (HRCLS). While the STM measurements reveal complete wetting and a bilayer growth on clean NiAl(110), Ag nanoparticles with a minimum size of 5 nm were obtained on the oxidized NiAl(110). The difference in Ag growth mode on clean and oxidized NiAl( 110) is supported by Ag 3d HRCLS. The binding energy for Ag on clean NiAl(110) is the same as for bulk Ag, while the Ag 3d peak for particles on oxidized NiAl(110) shifts toward the bulk binding energy with increasing size. The adsorption properties at 100 K of CO and NO on oxidized NiAl( 110) and on Ag particles on oxidized NiAl(110) were also investigated by probing the C 1s and N 1s core levels. In the case of oxidized NiAl(110), neither CO nor NO adsorbs. In the case of Ag particles on oxidized NiAl(110), CO does not adsorb, but a component at 397 eV is observed in the N 1s level after NO exposures. This component is tentatively assigned to silver nitride, suggesting NO dissociation in the presence of Ag particles on oxidized NiAl(110).

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Cathodoluminescence of small silver particles on Al2O3/NiAl (110)

Cited by 5 publications

References 36 publications

Optical excitations in electron microscopy

Optical excitations in electron microscopy

Photochemistry on Metal Nanoparticles

Toward a Silver–Alumina Model System for NO_x Reduction Catalysis

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Cathodoluminescence of small silver particles on Al2O3/NiAl (110)

Cited by 5 publications

References 36 publications

Optical excitations in electron microscopy

Optical excitations in electron microscopy

Photochemistry on Metal Nanoparticles

Toward a Silver–Alumina Model System for NOx Reduction Catalysis

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Product

Resources

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Toward a Silver–Alumina Model System for NO_x Reduction Catalysis