Plasmons in supported size-selected silver nanoclusters

Lünskens, Tobias; Heister, Philipp; Thämer, Martin; Walenta, Constantin A.; Kartouzian, Aras; Heiz, Ulrich

doi:10.1039/c5cp01582k

Cited by 53 publications

(52 citation statements)

References 39 publications

(100 reference statements)

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“…This redshift has also recently been reported for glutathione-stabilized magic numbers (15, 18, 22, 25, 29 and 38) we found for Ag 19 . Recent studies using surface second harmonic generation spectroscopy [65] and manufactured highly fluorescent Ag nanoclusters in alumina-silica composite optical fiber [66] also found redshift with increasing cluster size. Similar redshift has also been found for Au clusters [67].…”

Section: Plasmon Energy and Cluster Sizementioning

confidence: 99%

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Titantah

Karttunen

2016

Eur. Phys. J. B

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Abstract. Electronic and optical properties of silver clusters were calculated using two different ab initio approaches: (1) based on all-electron full-potential linearized-augmented plane-wave method and (2) local basis function pseudopotential approach. Agreement is found between the two methods for small and intermediate sized clusters for which the former method is limited due to its all-electron formulation. The latter, due to non-periodic boundary conditions, is the more natural approach to simulate small clusters. The effect of cluster size is then explored using the local basis function approach. We find that as the cluster size increases, the electronic structure undergoes a transition from molecular behavior to nanoparticle behavior at a cluster size of 140 atoms (diameter ∼1.7 nm). Above this cluster size the steplike electronic structure, evident as several features in the imaginary part of the polarizability of all clusters smaller than Ag147, gives way to a dominant plasmon peak localized at wavelengths 350 nm ≤ λ ≤ 600 nm. It is, thus, at this length-scale that the conduction electrons' collective oscillations that are responsible for plasmonic resonances begin to dominate the opto-electronic properties of silver nanoclusters.

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Section: Plasmon Energy and Cluster Sizementioning

confidence: 99%

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Titantah

Karttunen

2016

Eur. Phys. J. B

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“…

normalћω = 3.21 + 0.58 / D, where

the average diameter of the colloidal particle is D ≥ 1 nm due to the limited resolution of the electron microscopy. As can be seen, ћω in is increasing when the size of the noble metal cluster decreases . Substituting the value D = 0.73 nm (see Table .)…”

Section: Resultsmentioning

confidence: 99%

The collective excitations and static dipole polarizability in small nanoparticles

Leiro

2018

Surface & Interface Analysis

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Collective dipole excitations for small clusters have been considered in the energy range close to the visible light. The absorption energies and static dipole polarizabilities are estimated. In the case of Ag8, Na18, Na20, Cs40, Mg10, Ba20, Ag9+, Na21+, and Mg11++ clusters, a semiclassical density functional method with the Thomas‐Fermi approximation has been used. Also, applications in Al6, Al7, (ZnS)3, and (ZnSe)4 will be discussed. The results are compared with the available data.

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“…[52][53][54][55] In order to evaluate the chiroptical properties of the CF-2 selfassemblies, we measure second harmonic generation circular dichroism (SHG-CD). [52][53][54][56][57][58] The corresponding g-values were then calculated according to the following equation (LCP and RCP stand for left and right circularly polarized light): We observed a 1000-fold magnification of the SHG-CD g-values for monolayer-thin films of (P)-CF-2 and (M)-CF-2 molecules compared to the linear CD g-values of CF-2 in multilayer or solution. These results enabled the clear observation of the chiroptical response for the developed device-compatible surfaces (Figure 3, see also Figure S2 in the SI).…”

Section: Resultsmentioning

confidence: 99%

Device-Compatible Chiroptical Surfaces through Self-Assembly of Enantiopure Allenes

Ozcelik¹,

Pereira-Cameselle²,

Weber

et al. 2018

Langmuir

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Chiroptical methods have been proven to be superior compared to their achiral counterparts for the structural elucidation of many compounds. In order to expand the use of chiroptical systems to everyday applications, the development of functional materials exhibiting intense chiroptical responses is essential. Particularly, tailored and robust interfaces compatible with standard device operation conditions are required. Herein, we present the design and synthesis of chiral allenes and their use for the functionalization of gold surfaces. The self-assembly results in a monolayer-thin room-temperature-stable upstanding chiral architecture as ascertained by ellipsometry, X-ray photoelectron spectroscopy, and near-edge X-ray absorption-fine-structure. Moreover, these nanostructures anchored to device-compatible substrates features intense chiroptical second harmonic generation. Both straight-forward preparation of the device-compatible interfaces along with their chiroptical nature provide major prospects for everyday applications.

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Plasmons in supported size-selected silver nanoclusters

Cited by 53 publications

References 39 publications

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

The collective excitations and static dipole polarizability in small nanoparticles

Device-Compatible Chiroptical Surfaces through Self-Assembly of Enantiopure Allenes

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