Size-dependence of the effective electron-phonon energy relaxation in hollow gold nanospheres

Fan, Yun; Li, J.; Chen, H.; Xiang, Lan; Liu, X.

doi:10.2478/s11772-014-0172-4

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…They are not considered in this work, as size quantization and surface scattering would have to be included, as well possible changes to other scattering pathways. 31,32 Both, important for nanoparticles smaller than ca. 5 nm, induce redor blueshis of the LSPR, however, the expected magnitude of the shis is on the order of a few hundred meV and this will not affect the expected enhancements signicantly.…”

Section: Discussionmentioning

confidence: 99%

Optical enhancement of plasmonic activity of catalytic metal nanoparticles

Antosiewicz

Apell

2015

RSC Adv.

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Section: Discussionmentioning

confidence: 99%

Optical enhancement of plasmonic activity of catalytic metal nanoparticles

Antosiewicz

Apell

2015

RSC Adv.

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“…Third, absorption enhancement in such plasmonic systems is sensitive to the properties of the considered materials . In the case of nanoparticles smaller than 10 nm the bulk dielectric function may not be a good approximation, but in fact should include surface scattering effects . We expect that surface effects will increase losses in such small particles and as a consequence the absorption enhancement will be lower .…”

Section: Resultsmentioning

confidence: 99%

Plasmon‐Assisted Indirect Light Absorption Engineering in Small Transition Metal Catalyst Nanoparticles

Antosiewicz

Wadell

Langhammer

2015

Advanced Optical Materials

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Light absorption in plasmonic nanoantennas constitutes an interesting way of enhancing catalytic reactions occurring at surfaces of metals nanoparticles by forming hot electron–hole pairs. These can either directly transfer to empty orbitals of adsorbed species on the nanoparticle surface or thermalize via electron–phonon coupling and enhance reaction rates via a photothermal reaction channel. While this scheme, in principle, can be efficient for the well‐known plasmonic materials Ag and Au due to their large optical cross‐sections, other transition metals, which exhibit excellent catalytic properties, have spectrally broad and weak plasmon resonances. Thus, lower plasmon‐induced electron–hole pair excitation is expected, especially for sub‐10 nm nanoparticles, typical in heterogeneous catalysis. Here, a solution is presented to circumvent these limitations by challenging the established picture that plasmonic nanoparticles also constitute catalytically active entities in a plasmon mediated hot electron catalysis concept. Light absorption in catalyst nanoparticles can be engineered via an adjacent noble metal plasmonic nanoantenna that efficiently collects incident radiation with low losses, and couples it into the catalytic particles where the energy is dissipated due to the intrinsically high optical losses in transition metals at near‐visible frequencies. Absorption enhancement of 1–2 orders of magnitude is predicted in 3–4 nm sized Pd catalyst nanoparticles.

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“…Whereas the energy shift is small compared to the peak position in an absorption spectrum of a small particle, the width is a much more sensitive parameter to what takes place inside and around the particle. Mechanisms affecting the width include shape changes, vibrations in the particle (with electron-phonon coupling dependent on particle geometry [16]) and scattering processes of the conduction electrons common to bulk materials (electron-electron and electron-defect scattering). Chemical effects associated with the bonding of adsorbed molecules from a reactive host matrix to the particle surface [17] or the presence of ligand molecules also contribute to the plasmon width.…”

Section: Introductionmentioning

confidence: 99%

Surface scattering contribution to the plasmon width in embedded Ag nanospheres

Monreal¹,

Apell²,

Antosiewicz³

2014

Opt. Express

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Abstract:Nanometer-sized metal particles exhibit broadening of the localized surface plasmon resonance (LSPR) in comparison to its value predicted by the classical Mie theory. Using our model for the LSPR dependence on non-local surface screening and size quantization, we quantitatively relate the observed plasmon width to the nanoparticle radius R and the permittivity of the surrounding medium ε m . For Ag nanospheres larger than 8 nm only the non-local dynamical effects occurring at the surface are important and, up to a diameter of 25 nm, dominate over the bulk scattering mechanism. Qualitatively, the LSPR width is inversely proportional to the particle size and has a nonmonotonic dependence on the permittivity of the host medium, exhibiting for Ag a maximum at ε m ≈ 2.5. Our calculated LSPR width is compared with recent experimental data.

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Size-dependence of the effective electron-phonon energy relaxation in hollow gold nanospheres

Cited by 3 publications

References 13 publications

Optical enhancement of plasmonic activity of catalytic metal nanoparticles

Optical enhancement of plasmonic activity of catalytic metal nanoparticles

Plasmon‐Assisted Indirect Light Absorption Engineering in Small Transition Metal Catalyst Nanoparticles

Surface scattering contribution to the plasmon width in embedded Ag nanospheres

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