Electronic structure and plasmonic activity in co-evaporated Ag-In bimetallic alloys

Todorov, R.; Hristova-Vasileva, Temenuga; Katrova, Vesela; Atanasova, Anna; Milushev, G.

doi:10.1016/j.jallcom.2021.163253

Cited by 5 publications

(23 citation statements)

References 46 publications

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“…The quantities Is and Ic are related to the ellipsometric angles ψ and Δ, as follows: Is = sin2Ψ.sinΔ and Ic = sin2ψ.cosΔ. A detailed description of the procedures for calculation of the complex permittivity is given in [8]. According to the results for the phase composition of Au-Sb thin films, the complex permittivity can be considered as the effective values of mixtures of Au and AuSb2 for Sb content less than 67 at.…”

Section: Resultsmentioning

confidence: 99%

Structural and optical characterization of thin films from bimetallic Au-Sb system as tuneable plasmonic material for UV spectral range

Todorov

Katrova

Hristova-Vasileva

et al. 2023

J. Phys.: Conf. Ser.

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The optical properties of silver and gold based bimetallic alloys make possible to adjust their plasma frequency. The direct alloying and plasmonic activity of thin layers from the Au-Sb system are presented in the present work. The thin films were deposited by thermal co-evaporation of gold and antinomy. The chemical and phase composition of thin films, were analysed by X-ray microanalysis and X-ray diffraction (XRD), respectively. The results of the X-ray microanalysis show that the composition of the thin layers corresponds well to the predetermined. The XRD patterns, depending on the envisaged compositions, show formation of intermetallic compound AuSb2 and binary alloys between the initial elements and the intermediate compound, which is in accordance with the Au-Sb phase diagram. The dispersion of the complex permittivity was determined by spectroscopic ellipsometry. The results show that the increase of the antimony content leads to an increase of the values of the imaginary part of the complex permittivity in the visible spectral region at photon energies greater than 3 eV, and a decrease in the ultraviolet spectral region. Based on the obtained dispersions of the complex permittivity, extinction cross-sections and local field enhancement of spherical Au-Sb nanoparticles were determined and their plasmon activity was evaluated.

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Section: Resultsmentioning

confidence: 99%

Structural and optical characterization of thin films from bimetallic Au-Sb system as tuneable plasmonic material for UV spectral range

Todorov

Katrova

Hristova-Vasileva

et al. 2023

J. Phys.: Conf. Ser.

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“…As it was shown up to here, the higher order of the intermetallic crystalline compounds can improve plasmon efficiency, and it could even be greater than this of heavily doped silver-based solid solutions of the p-block elements. The optical properties of the intermetallic phases are studied in presynthesized bulk samples of compounds from the Ag-Zn and Ag-Cd systems, , in presynthesized crystal samples of AuAl 2 , AuGa 2 , AuIn 2 − and AuSb 2 , in the case of the presence of crystalline compounds in thin films from the systems Ag-Ga, Ag-In, ,, and Ag-Al, as well as in Ag/Sn and Au/In multilayer structures. , …”

Section: Optical Properties Of Intermetallic Compoundsmentioning

confidence: 99%

“…The analysis of the Lorentzian component of the dielectric function shows intense interband transitions in the visible spectral region in the interval 1.7–2.2 eV. The largest contribution of the interband transitions to the total dielectric function is in the case of a thin film with a composition close to the AgIn 2 intermetallic phase, as a result of which the negativity of the real part decreases …”

Section: Optical Properties Of Intermetallic Compoundsmentioning

confidence: 99%

“…In order to evaluate the efficiency of nanoparticles in the case of intermetallic compounds, we used published data for the complex permittivity , for calculation of the spectra of the cross-section of excitation of spherical intermetallic nanoparticles with diameter, d NP = 20 nm, embedded in a dielectric medium with a refractive index of 1.5 using a procedure proposed by Cortés-López et al…”

Section: Optical Properties Of Intermetallic Compoundsmentioning

confidence: 99%

“…Comparison of the cross-section of extinction σ ext of some intermetallic compounds of silver (a) and gold (b) and p-block metals. Published data ,,, were used for calculation of σ ext .…”

Section: Optical Properties Of Intermetallic Compoundsmentioning

confidence: 99%

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Silver and Gold Containing Compounds of p-Block Elements As Perspective Materials for UV Plasmonics

et al. 2023

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We present a review of phase formation tendencies, methods for preparation and optical properties of alloys and compounds from the binary systems of silver or gold with metals and metalloids from the p-block of the Periodic system of elements. Reference data about the homogeneity regions in the systems of interest, together with information about the crystalline structure of existing indexed compounds in them, is proposed and statistically analyzed. General background for the synthesis of intermetallic alloys and compounds, and the tendencies for their preparation for plasmonic purposes are presented. The high plasma frequency, ω p of p-block metals makes their alloys with silver and gold an interesting object of study, due to the possibility of ω p variation over a wide interval in the ultraviolet (UV) spectral region with a view to finding more efficient materials for excitation of a localized surface plasmon resonance (LSPR) necessary for various applications and techniques operating in this part of the electromagnetic spectrum. Unlike the alloys between the noble metals Cu, Ag, and Au, which form continuous series of solid solutions, different areas can be observed in the phase diagrams of the Ag(Au)−p-block systems, containing solid solutions, intermetallic compounds, and heterogeneous mixtures. The ability to vary the plasma frequency of solid solutions, like the alloys between the noble metals Cu, Ag, and Au, is the reason to pay attention to the compositions of the Ag(Au−p-block systems that fall in these regions of their phase diagrams. The analysis of the published results for complex permittivity shows that the addition of small amounts of conductive p-block elements to noble metals reduces the energy gap for interband transitions and increases their plasmonic activity in the UV spectral range. The article analyzes the relationship between electrical resistivity and LSPR excitation efficiency, which shows that the intermetallic compounds from Ag(Au)−p-block systems with a well-ordered crystalline structure and good conductivity level can be more effective materials for UV plasmonics than the boundary solid solutions. Intermetallic compounds can be easily obtained in the form of bulk samples, thin films, and nanoparticles with controlled size and geometric shape. The spectral dependences of the plasmon efficiency of the intermetallic compounds, determined from their complex permittivity functions, show that they are promising materials for excitation of LSPR in the UV spectral region.

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Plasmonic Nanostructures for the Detection of Foodborne Pathogens

Kyaw,

Myint,

Al-Harthi

2024

Advanced Structured Materials

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Electronic structure and plasmonic activity in co-evaporated Ag-In bimetallic alloys

Cited by 5 publications

References 46 publications

Structural and optical characterization of thin films from bimetallic Au-Sb system as tuneable plasmonic material for UV spectral range

Structural and optical characterization of thin films from bimetallic Au-Sb system as tuneable plasmonic material for UV spectral range

Silver and Gold Containing Compounds of p-Block Elements As Perspective Materials for UV Plasmonics

Plasmonic Nanostructures for the Detection of Foodborne Pathogens

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