Electromagnetic effect in enhanced infrared absorption of adsorbed molecules on thin metal films

Osawa, Masatoshi; Kuramitsu, M; Hatta, A.; Suëtaka, Wataru; Seki, H.

doi:10.1016/0039-6028(86)90001-4

Cited by 77 publications

(37 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The enhanced absorption is proportional to the average electromagnetic (EM) field within the metal film [10,11]. T heoretical model The above mentioned findings (5-7) suggest strongly that some EM mechanism is responsible for SEIRA as for the case of SERS [1].…”

Section: Methodsmentioning

confidence: 99%

Surface Enhanced Infrared Absorption Spectroscopy

et al. 1991

View full text Add to dashboard Cite

Infrared (IR) absorption of molecules is enhanced , greatly (101-103 times) when they are adsorbed on or near vacuum-evaporated Ag or Au thin films. By using this surface Enhanced i$ absorption (SEIRA) phenomenon, we could obtained IR spectra of some organic molecules of a few picogram amount in good signal-to-noise ratios. Thus, the SEIRA spectroscopy is promising as a new trace analytical technique. General properties of SEIRA found in our experiments are summarized . An electromagnetic theory of this phenomenon is proposed. Key W surface enhanced infrared spectroscopy, trace analysisOptical properties of molecules are altered dramatically when they are adsorbed on or near some rough metal surfaces. Surface enhanced Raman scattering (SERS) [1] is the most prominent example. Similar surface enhanced

show abstract

Section: Methodsmentioning

confidence: 99%

Surface Enhanced Infrared Absorption Spectroscopy

et al. 1991

View full text Add to dashboard Cite

show abstract

“…In the past 30 years IRRAS has developed into a powerful analytical tool to probe films adsorbed at the electrode|electrolyte interface [18,22,29,[49][50][51]. When IR-RAS is combined with electrochemical experiments, the following considerations have to be taken into account: ( ) a selection of a mirror for the IR radiation, which simultaneously serves as a working electrode, (ii) a strong absorption of the IR radiation by the electrolyte (usually aqueous solution) and (iii) the use of an IR optical window which is required to prevent electrolyte leakage.…”

Section: Application Of Irras To the Electrochemical Interface: Theormentioning

confidence: 99%

“…In addition, aqueous solutions used in most of these in situ IRRAS experiments, absorb the IR radiation very strong contributing to a strong background signal which overlaps with a usually weak absorption from the adsorbed biomolecules. These experimental challenges of in situ IRRAS were solved by using either a cell in Kretchmann configuration and the phenomenon of total reflection of the IR light [22] or a thin electrolyte layer cell for experiments performed under condition of the external reflection of the IR beam [16]. In the last years attenuated total reflection infrared spectroscopy (ATR IRS) [23][24][25][26][27][28] and IRRAS tech-niques [9,11,29,30] have developed into powerful methods to study in situ the structure and its changes in biomolecules present in various supramolecular assemblies on the electrode surfaces.…”

Section: Introductionmentioning

confidence: 99%

Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies

Brand

2015

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

An ideal bioanalytical method would allow carrying out sensitive, selective, reproducible, fast, and in situ chemical measurements of the composition, structure and function of complex biological systems. Physical chemistry possesses advanced structure analyzing techniques which are suitable to solve, at a sub-molecular level, the structure of biomolecules. However, the prerequisite of the presence of the electrolyte solution limits the number of applicable structure analyzing techniques. Infrared spectroscopy is one of the most powerful analytical techniques used to identify the structure of biomolecules, monitor structural changes under various experimental environments and physical states. In addition, infrared reflection absorption spectroscopy (IRRAS) has been successfully applied to study supramolecular films at the solid|liquid interface. Assemblies of biomolecules belong to a particularly demanding because they bring specific for the maintenance of their functions experimental requirements which have to be taken into account planning in situ spectroelectrochemical experiments. In this paper potnential of in situ IRRAS under electrochemical control for studies of structural changes in assemblies of biomolecules such as lipid bilayers and protein films is described. Studies of different classes of biomolecules bring certain experimetnal conditions concerning the electrolyte composition, pH value, temperature or chemical nature of the solid support, which have to be fulfilled. Obviously, these conditons may significantly restrict the applicability of the in situ PM IRRAS. The selection of the solid substrate with required optical and electrical properties, the optical window and the electrolyte composition have to be adapted to the needs of biomolecules. Adjustement of experimetnal conditions as well as possibilites of the enlargement of the in situ PM IRRAS for studies of biomimetic assemblies is reviewed in this paper. Furthermore, experimetnal resutls reporting potenial driven changes in models of cell membranes and protein films are reviewed. Pioneering studies aiminig at the determination of structural changes in lipid membranes exposed to physiological electric fields and interacting simultaneously with protiens are described.

show abstract

“…Accordingly, the apparent enhancement factor of SEIRAS is calculated to be 28 (= 8.5 × 3.3) for p-polarization including the contribution of the larger surface area. The absence of any bands for s-polarization is due to the destructive interaction of the IR radiation within the metal film [26,43].…”

Section: Influence Of Ir Polarization State On the Seiras Spectramentioning

confidence: 99%

Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

Kunimatsu

Senzaki

Samjeské

et al. 2007

Electrochimica Acta

152

146

View full text Add to dashboard Cite

Hydrogen evolution reaction (HER) on a polycrystalline Pt electrode has been investigated in Ar-purged acids by surface-enhanced infrared absorption spectroscopy and electrochemical kinetic analysis (Tafel plot). A vibrational mode characteristic to H atom adsorbed at atop sites (terminal H) was observed at 2080-2095 cm -1 . This band appears at 0.1 V (RHE) and grows at more negative potentials in parallel to the increase in hydrogen evolution current. Good signal-to-noise ratio of the spectra enabled us to establish the quantitative relation between the band intensity (equivalently, coverage) of terminal H and the kinetics of HER, from which we conclude that terminal H atom is the reaction intermediate in HER and the recombination of two terminal H atoms is the rate determining step. The quantitative analysis of the infrared data also revealed that the adsorption of terminal H follows the Frumkin isotherm with repulsive interaction.

show abstract

Electromagnetic effect in enhanced infrared absorption of adsorbed molecules on thin metal films

Cited by 77 publications

References 26 publications

Surface Enhanced Infrared Absorption Spectroscopy

Surface Enhanced Infrared Absorption Spectroscopy

Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies

Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

Contact Info

Product

Resources

About