The correlation between film thickness and adsorbate line shape in surface enhanced infrared absorption

Priebe, A.; Sinther, M.; Fahsold, G.; Pucci, Annemarie

doi:10.1063/1.1597232

Cited by 75 publications

(92 citation statements)

References 31 publications

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“…The area fraction is shown in Table 1. Up to this point, the model resembles that used in previous studies [12]. Therefore, it is possible to treat the metal thin film system with gaps that are completely filled up with the adsorbates.…”

Section: Calculation Modelmentioning

confidence: 88%

“…This result shows that the main enhancement effect of infrared absorption enhancement is included in the classical formula used in this calculation, and that enhancement is about 20 times at the maximum. In other studies [12], it is presumed that this enhancement effect originates in SP. However, according to the results presented in Fig.…”

Section: Comparison Of Calculated and Measured Seira Spectramentioning

confidence: 99%

“…Presuming that the cause of an asymmetrical band is not the Fano effect, it is necessary to consider what caused the asymmetrical band. At present, generally an asymmetrical band is thought to originate in Surface Plasmon (SP) [12,36]. SP is collective oscillation of the free-electron localized in the surface.…”

Section: Comparison Of Calculated and Measured Seira Spectramentioning

confidence: 99%

“…In enhancement of absorption intensity, a model that explains enhancement of absorption intensity by physical interactions is proposed [11,12]. In this model, it is presumed that enhancement of the absorption intensity of an adsorbate will come to occur by the following process: (1) Excitation of surface plasmon of the metal thin film by the incident electric field in the UV-Vis-NearIR region.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this asymmetrical band might be related to the SEIRA mechanism. To explain this enhanced absorption and asymmetrical absorption band, various theories have been proposed [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Surface plasmonic contribution to SEIRA and asymmetrical band

Nakashima¹,

Kita²,

Suzuki³

2014

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The Surface Enhanced InfraRed Absorption (SEIRA) band reaches its the maximum intensity and the band shape becomes asymmetric at the just percolated metal thin films. To explain for them, various models (e.g. the Fano model) have been proposed. However, no model can explain them completely. In this paper, we conducted a classical model calculations (Fresnel's formula and the Bruggemann effective medium theory) for SEIRA and asymmetric bands. The calculated SEIRA spectra were good agreement with the experimentally spectra. Therefore, the asymmetrical SEIRA band might not be attributable to Fano model. Moreover, we specifically addressed the relation between effective dielectric constants of a metal-insulator composite thin film and SEIRA band shape change. Although the sign of the real part switched from positive to negative and although the imaginary part became metallic, the asymmetrical band shape did not change. The sign of the real part is 28 Hiroshi Nakashima et. al.expected to be negative and the imaginary part would be metallic if the asymmetrical band shape change results from surface plasmon. Therefore, the asymmetrical band shape might not be attributable to surface plasmon.

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Section: Calculation Modelmentioning

confidence: 88%

Section: Comparison Of Calculated and Measured Seira Spectramentioning

confidence: 99%

Section: Comparison Of Calculated and Measured Seira Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface plasmonic contribution to SEIRA and asymmetrical band

Nakashima¹,

Kita²,

Suzuki³

2014

aap

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Surface‐Enhanced Infrared Spectroscopy

Neubrech¹

2006

Surface‐Enhanced Vibrational Spectroscopy

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Soon after the identification of the surface-enhanced Raman scattering effect, the new field of surface-enhanced spectroscopy was unleashed, including linear [1,2] and nonlinear optical phenomena [nonlinear optical effects include the surface-enhanced second harmonic generation (SESHG), surface-enhanced double photon fluorescence (SEDPF), surface-enhanced hyper-Raman scattering (SEHRS), surface-enhanced four-wave mixing (SEFWM), surface-enhanced coherent anti-Stokes Raman scattering (SECARS) [3][4][5]. In particular, with Raman and infrared being the two faces of the vibrational coin, the search for the complementary surface-enhanced infrared absorption (SEIRA) was quickly rewarded with success [6]. Therefore, one can speak of surface-enhanced vibrational spectroscopy (SEVS), providing enhanced scattering and enhanced absorption techniques. The first SEIRA report by Hartstein et al.

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Reflection Absorption IR Spectroscopy (RAIRS)

Hinrichs

2011

Surface and Thin Film Analysis

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Refl ection absorption infrared spectroscopy ( RAIRS ) is a well -established vibrational spectroscopic method that is frequently applied within the research areas of chemistry, physics, and biology [1 -34] . The technique is used to identify and characterize the chemical state, molecular structure, anisotropy, and conductivity of thin fi lms adsorbed onto metallic and nonmetallic surfaces. Vibrational spectra are used as characteristic fi ngerprints for adsorbate molecules, adsorption confi gurations, and structures. The method is also referred to as different acronyms, including RAIRS, FT -IRAS, IRRAS, and ERIRS ( external refl ection infrared spectroscopy ), all of which refer to the same principle of measurement using IR radiation and a refl ection absorption geometry. Typically, this technique involves a single external refl ection at a sample covered substrate. The sample absorbs radiation at material specifi c frequencies of free carriers, electronic transitions, or vibrational bands, and a corresponding absorption occurs in the spectrum of the refl ected radiation. For this technique, substrates are chosen that do not produce disturbing absorption bands in the spectral range of interest. 23

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The correlation between film thickness and adsorbate line shape in surface enhanced infrared absorption

Cited by 75 publications

References 31 publications

Surface plasmonic contribution to SEIRA and asymmetrical band

Surface plasmonic contribution to SEIRA and asymmetrical band

Surface‐Enhanced Infrared Spectroscopy

Reflection Absorption IR Spectroscopy (RAIRS)

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