Infrared absorption enhancement of monolayer species on thin evaporated Ag films by use of a Kretschmann configuration: Evidence for two types of enhanced surface electric fields

Hatta, A.; Suzuki, Yuta; Suëtaka, Wataru

doi:10.1007/bf00616965

Cited by 111 publications

(57 citation statements)

References 18 publications

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“…24,25) This enhancement is characterized by the facts: only those vibrations that yield a change in the dipole moment perpendicular to the surface of the islands are enhanced 25,26) and the enhancement saturates at a certain distance (ca. 5 nm) from the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

et al. 2004

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Infrared absorption measurements at normal incidence of radiation have been carried out on octadecanethiol (ODT) deposited from ethanol-water mixed solutions onto colloidal silver particles (ca. 30 nm diameter) on Si(111) substrates. The infrared absorption spectra taken as functions of silver mass thickness and ODT concentration show that the intensities of the CH 2 asymmetric and symmetric stretch modes of ODT are twice enhanced in comparison to those observed in the absence of the particles. The spectra also reveal that at any ODT concentration the absorption intensities exhibit a maximum for a particular mass thickness of the particles, indicating that the enhancement is linked to the aggregation of the particles. Contribution of the surface plasmon resonance apparently does not play a major role in the present systems. Approximately the same magnitude of enhancement is obtained for silver hydrosol particles exposed to ODT from the solution followed by depositing on the substrates. Scanning electron morphological inspection has been done on the aggregates in relation to the enhancement.

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Section: Introductionmentioning

confidence: 99%

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

et al. 2004

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“…The best-known example is surface-enhanced Raman scattering (SERS), in which the Raman scattering of molecules is enhanced by millions of times compared with free molecules [1,2,3,4]. A quite similar effect occurs in the mid-infrared region: molecules on metal surfaces show infrared absorption 10-1000 times more intense than would be expected from conventional measurements without the metal [5,6,7,8]. This effect is referred to as surface-enhanced infrared absorption (SEIRA) to emphasize the analogy to SERS.…”

Section: Introductionmentioning

confidence: 99%

“…Enhanced spectra can be observed in the transmission [9,10], attenuatedtotal-reflection (ATR) [5,6,7], external-reflection [11], and diffuse-reflection modes [12]. In ATR and external-reflection measurements, the observed band intensities depend on the polarization and angle of incidence of the infrared radiation [11,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The enhancement depends greatly on the morphology of the metal surface [15]. Vacuum-evaporated [5,6,7] and electrochemically deposited [16,17,18,19] metal island films, and metal colloids [20,21] are good enhancers. In the case of island films, the largest enhancement is observed when the islands are densely crowded but not touching each other.…”

Section: Introductionmentioning

confidence: 99%

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Surface-Enhanced Infrared Absorption

Osawa

Topics in Applied Physics

355

283

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Abstract. Molecules adsorbed on metal island films or particles exhibit 10-1000 times more intense infrared absorption than would be expected from conventional measurements without the metal. This effect is referred to as surface-enhanced infrared absorption (SEIRA) to emphasize the similarities with surface-enhanced Raman scattering (SERS). The electromagnetic interactions of the incident photon field with the metal and molecules play predominant roles in this effect. The chemical interactions of the molecules with the surface can give additional enhancement. The enhancement mechanisms and some applications of SEIRA.

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“…For this reason, sensing using MIF is typically based on shift of the maximum of the SPR band upon changes of dielectric environment. In addition, the strong near field enhancement taking place close to the island surface, allows amplification of Raman signal [3][4][5][6] or infrared absorption [7][8][9][10] of closely located molecules. The near field enhancement is largest for very small particles and inter-particle distances, which are typically few nanometers in the case of MIF.…”

Section: Introductionmentioning

confidence: 99%

Metal island film-based structures for sensing using spectrophotometry and ellipsometry

et al. 2013

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Metal island films (MIF) are good candidates for sensors due to the strong sensitivity of the localized surface plasmon resonance (SPR) to the environment refractive index. The strong near field enhancement in the vicinity of the island surface can be even higher if a metal layer (ML) is placed close to a MIF. Structures containing MIF with and without ML are prepared and sensitivities of spectrophotometric and ellipsometric features of the measurements compared. It is shown that simple MIF is preferable for ellipsometry-based sensing and the one including ML in the case of spectrophotometric measurements.

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Infrared absorption enhancement of monolayer species on thin evaporated Ag films by use of a Kretschmann configuration: Evidence for two types of enhanced surface electric fields

Cited by 111 publications

References 18 publications

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

Surface-Enhanced Infrared Absorption

Metal island film-based structures for sensing using spectrophotometry and ellipsometry

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