Résumé

Polarisation-dependent sum frequency generation (SFG) spectroscopy is used to investigate the orientation of molecules on metallic surfaces. In particular, self-assembled monolayers (SAMs) of dodecanethiol (DDT) and of p-nitrothiophenol (p- NTP), grown on Pt and on Au, have been chosen as models to highlight the ability of combining ppp and ssp polarisations sets (representing the polarisation of the involved beams in the conventional order of SFG, Vis and IR beam) to infer orientational information at metallic interfaces. Indeed, using only the ppp set of data, as it is usually done for metallic surfaces, is not sufficient to determine the full molecular orientation. We show here that simply combining ppp and ssp polarisations enables both the tilt and rotation angles of methyl groups in DDT SAMs to be determined. Moreover, for p-NTP, while the SFG active vibrations detected with the ppp polarisation alone provide no orientational information, however, the combination with ssp spectra enables to retrieve the tilt angle of the p- NTP 1,4 axis. Though orientational information obtained by polarisation-dependent measurements has been extensively used at insulating interfaces, we report here their first application to metallic surfaces. © 2010 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.

langue originaleAnglais
Pages (de - à)607-615
Nombre de pages9
journalChemPhysChem
Volume11
Numéro de publication3
Les DOIs
étatPublié - 22 févr. 2010

Empreinte digitale

Self assembled monolayers
Metals
Spectroscopy
Polarization
polarization
metals
spectroscopy
Molecular orientation
vibration
Molecules
molecules

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title = "Orientational analysis of dodecanethiol and p-nitrothiophenol SAMs on metals with polarisation dependent SFG spectroscopy",
abstract = "Polarisation-dependent sum frequency generation (SFG) spectroscopy is used to investigate the orientation of molecules on metallic surfaces. In particular, self-assembled monolayers (SAMs) of dodecanethiol (DDT) and of p-nitrothiophenol (p- NTP), grown on Pt and on Au, have been chosen as models to highlight the ability of combining ppp and ssp polarisations sets (representing the polarisation of the involved beams in the conventional order of SFG, Vis and IR beam) to infer orientational information at metallic interfaces. Indeed, using only the ppp set of data, as it is usually done for metallic surfaces, is not sufficient to determine the full molecular orientation. We show here that simply combining ppp and ssp polarisations enables both the tilt and rotation angles of methyl groups in DDT SAMs to be determined. Moreover, for p-NTP, while the SFG active vibrations detected with the ppp polarisation alone provide no orientational information, however, the combination with ssp spectra enables to retrieve the tilt angle of the p- NTP 1,4 axis. Though orientational information obtained by polarisation-dependent measurements has been extensively used at insulating interfaces, we report here their first application to metallic surfaces. {\circledC} 2010 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.",
keywords = "Density functional calculations, Self-assembled monolayers, Sum frequency generation, Surface analysis, Vibrational spectroscopy",
author = "Francesca Cecchet and Dan Lis and Julien Guthmuller and Beno{\^i}t Champagne and Yves Caudano and Christophe Silien and Mani, {Alaa Addin} and Thiry, {Paul A.} and Andr{\'e} Peremans",
note = "Publication code : RES. ACAD.",
year = "2010",
month = "2",
day = "22",
doi = "10.1002/cphc.200900733",
language = "English",
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pages = "607--615",
journal = "ChemPhysChem",
issn = "1439-4235",
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TY - JOUR

T1 - Orientational analysis of dodecanethiol and p-nitrothiophenol SAMs on metals with polarisation dependent SFG spectroscopy

AU - Cecchet, Francesca

AU - Lis, Dan

AU - Guthmuller, Julien

AU - Champagne, Benoît

AU - Caudano, Yves

AU - Silien, Christophe

AU - Mani, Alaa Addin

AU - Thiry, Paul A.

AU - Peremans, André

N1 - Publication code : RES. ACAD.

PY - 2010/2/22

Y1 - 2010/2/22

N2 - Polarisation-dependent sum frequency generation (SFG) spectroscopy is used to investigate the orientation of molecules on metallic surfaces. In particular, self-assembled monolayers (SAMs) of dodecanethiol (DDT) and of p-nitrothiophenol (p- NTP), grown on Pt and on Au, have been chosen as models to highlight the ability of combining ppp and ssp polarisations sets (representing the polarisation of the involved beams in the conventional order of SFG, Vis and IR beam) to infer orientational information at metallic interfaces. Indeed, using only the ppp set of data, as it is usually done for metallic surfaces, is not sufficient to determine the full molecular orientation. We show here that simply combining ppp and ssp polarisations enables both the tilt and rotation angles of methyl groups in DDT SAMs to be determined. Moreover, for p-NTP, while the SFG active vibrations detected with the ppp polarisation alone provide no orientational information, however, the combination with ssp spectra enables to retrieve the tilt angle of the p- NTP 1,4 axis. Though orientational information obtained by polarisation-dependent measurements has been extensively used at insulating interfaces, we report here their first application to metallic surfaces. © 2010 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.

AB - Polarisation-dependent sum frequency generation (SFG) spectroscopy is used to investigate the orientation of molecules on metallic surfaces. In particular, self-assembled monolayers (SAMs) of dodecanethiol (DDT) and of p-nitrothiophenol (p- NTP), grown on Pt and on Au, have been chosen as models to highlight the ability of combining ppp and ssp polarisations sets (representing the polarisation of the involved beams in the conventional order of SFG, Vis and IR beam) to infer orientational information at metallic interfaces. Indeed, using only the ppp set of data, as it is usually done for metallic surfaces, is not sufficient to determine the full molecular orientation. We show here that simply combining ppp and ssp polarisations enables both the tilt and rotation angles of methyl groups in DDT SAMs to be determined. Moreover, for p-NTP, while the SFG active vibrations detected with the ppp polarisation alone provide no orientational information, however, the combination with ssp spectra enables to retrieve the tilt angle of the p- NTP 1,4 axis. Though orientational information obtained by polarisation-dependent measurements has been extensively used at insulating interfaces, we report here their first application to metallic surfaces. © 2010 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.

KW - Density functional calculations

KW - Self-assembled monolayers

KW - Sum frequency generation

KW - Surface analysis

KW - Vibrational spectroscopy

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U2 - 10.1002/cphc.200900733

DO - 10.1002/cphc.200900733

M3 - Article

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EP - 615

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SN - 1439-4235

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