IR Reflection Spectra of Monolayer Films Sandwiched between Two High Refractive Index Materials

Lummerstorfer, Thomas; Hoffmann, Helmuth

doi:10.1021/la0492916

Cited by 40 publications

(41 citation statements)

References 23 publications

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“…It is interesting that although conventional ATR and specular reflection have similar intensity multipliers, the former method is approximately seven times more sensitive. Also it can be shown with the present formalism that regular reflectance can be viable but only for metal substrates near grazing incidence (h 1 $ 80°) when the sensitivity (per reflection) is similar to that for conventional ATR [5]. Fig.…”

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confidence: 76%

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Infrared spectroscopy of self-assembled monolayer films on silicon

Rowell

Tay

Boukherroub³

et al. 2007

Surface Science

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mentioning

confidence: 76%

“…The FTIR spectrometer, equipped with a silicon-carbide source, KBr beamsplitter, and HgCdTe detector, was operated in purge mode at a resolution of 8 cm À1 . The ATR method utilizes a high-index hemisphere in intimate contact with layers on a Si substrate [2][3][4][5] as depicted in the upper left inset of Fig. 1.…”

mentioning

confidence: 99%

Infrared spectroscopy of self-assembled monolayer films on silicon

Rowell

Tay

Boukherroub³

et al. 2007

Surface Science

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“…106,107,111,115,118 Also odd-order spectroscopy can determine the average orientation of adsorbates via different signal strengths obtained from s-and p-polarized light. [122][123][124][125] In contrast to even-order spectrosocpy, however, they cannot distinguish parallel from anti-parrallel alignment.…”

Section: Selection Rules For Molecules At Interfacesmentioning

confidence: 96%

Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy

2016

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Ultrafast two-dimensional infrared spectroscopy (2D IR) has been advanced in recent years toward measuring signals from only a monolayer of sample molecules at solid-liquid and solid-gas interfaces. A series of experimental methods has been introduced, which in the chronological order of development are 2D sum-frequency-generation (2D SFG), transmission 2D IR, and reflection 2D IR, the latter in either internal, attenuated total reflection (ATR), or external reflection configuration. The different variants of 2D vibrational spectroscopy are based on either the even-order or the odd-order nonlinear susceptibility, and all allow resolving similar molecular temporal and spectral information. In this review, we introduce the basic principles of the different methods of 2D vibrational spectroscopy at surfaces along with a balanced overview on the technological aspects as well as benefits and shortcomings. We furthermore discuss the current scope of applications for 2D vibrational surface spectroscopy, which spans an impressively broad range of samples from biological molecules to heterogeneous catalysts. The emphasis is on the ultrafast structural dynamics of molecules at interfaces, environmental interactions, and intermolecular interactions. We furthermore consider important recent technological developments of 2D vibrational surface spectroscopy, which employ (i) surface enhancement, (ii) methods for studying electrochemical interfaces, and (iii) extensions for resolving nonequilibrium processes (transient 2D IR). A detailed outlook is finally given regarding important future applications and technological developments of 2D vibrational surface spectroscopy.

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“…The sensitivity of the ATR-FTIR technique strongly depends on the thickness of the air gap between the sample and the hemisphere prism, 27,28 which makes it quite challenging to make a quantitative analysis of the peak intensity. However, the results shown in Fig.…”

Section: B Spectroscopic Analysis Of Thiol Sams On "001… Gaasmentioning

confidence: 99%

Fourier-transform infrared and photoluminescence spectroscopies of self-assembled monolayers of long-chain thiols on (001) GaAs

Ding

Moumanis

Dubowski

et al. 2006

Journal of Applied Physics

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Self-assembled monolayers ͑SAMs͒ of various thiols have shown the potential to protect freshly fabricated or chemically cleaned GaAs surfaces from oxidization, adsorption of foreign atoms, and/or surface defect formation. We have employed an attenuated total reflection Fourier-transform infrared spectroscopic technique to investigate the process of formation of long-chain thiols, comprising ten or more methylene chains, on the surface of ͑001͒ GaAs. A strong infrared ͑IR͒ signal was measured for all the investigated GaAs-thiol interfaces. Varying the type of terminal groups, from hydrophilic to hydrophobic, significantly changes the IR intensity of the methylene stretching vibration, indicating different methylene chain orientation in SAMs. Consequently, these SAMs exhibited different passivation performance to the ͑001͒ GaAs surface as judged by the intensity of the GaAs-related photoluminescence signal.

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IR Reflection Spectra of Monolayer Films Sandwiched between Two High Refractive Index Materials

Cited by 40 publications

References 23 publications

Infrared spectroscopy of self-assembled monolayer films on silicon

Infrared spectroscopy of self-assembled monolayer films on silicon

Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy

Fourier-transform infrared and photoluminescence spectroscopies of self-assembled monolayers of long-chain thiols on (001) GaAs

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