Conformational order of n-dodecanethiol and n-dodecaneselenol monolayers on polycrystalline copper investigated by PM-IRRAS and SFG spectroscopy

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Abstract

Self-assembled monolayers (SAMs) of n-dodecanethiol (CHSH) and n-dodecaneselenol (CHSeH) on polycrystalline copper have been elaborated with the purpose of achieving densely packed and crystalline-like assemblies. By combining the surface sensitivity of polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation spectroscopy (SFG), the effect of the self-assembly time (15 min, 30 min, 1 h, 2 h and 24 h) on the formation of n-dodecanethiol and n-dodecaneselenol monolayers on untreated and electrochemically reduced polycrystalline copper has been investigated. On electrochemically reduced copper, PM-IRRAS spectroscopy shows that both molecules are able to form well organized layers. SFG spectroscopy indicates that the CHSeH SAMs are slightly better ordered than those achieved with CHSH. On untreated copper, the two molecules lead to different film organizations. Both PM-IRRAS and SFG indicate that CHSH SAMs are of the same film quality as those obtained on electrochemically reduced copper. On the contrary, CHSeH monolayers are invariably poorly organized at the molecular level.
Original languageEnglish
Pages (from-to)2276-2282
Number of pages7
JournalSurface Science
Volume603
Issue number15
DOIs
Publication statusPublished - 1 Aug 2009

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polarization modulation
infrared reflection
Absorption spectroscopy
Copper
Monolayers
absorption spectroscopy
Modulation
Spectroscopy
Polarization
Infrared radiation
Self assembled monolayers
copper
spectroscopy
Molecules
Self assembly
assemblies
self assembly
molecules
Crystalline materials

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@article{030c8d4c019149a2be577cbe2783c73d,
title = "Conformational order of n-dodecanethiol and n-dodecaneselenol monolayers on polycrystalline copper investigated by PM-IRRAS and SFG spectroscopy",
abstract = "Self-assembled monolayers (SAMs) of n-dodecanethiol (CHSH) and n-dodecaneselenol (CHSeH) on polycrystalline copper have been elaborated with the purpose of achieving densely packed and crystalline-like assemblies. By combining the surface sensitivity of polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation spectroscopy (SFG), the effect of the self-assembly time (15 min, 30 min, 1 h, 2 h and 24 h) on the formation of n-dodecanethiol and n-dodecaneselenol monolayers on untreated and electrochemically reduced polycrystalline copper has been investigated. On electrochemically reduced copper, PM-IRRAS spectroscopy shows that both molecules are able to form well organized layers. SFG spectroscopy indicates that the CHSeH SAMs are slightly better ordered than those achieved with CHSH. On untreated copper, the two molecules lead to different film organizations. Both PM-IRRAS and SFG indicate that CHSH SAMs are of the same film quality as those obtained on electrochemically reduced copper. On the contrary, CHSeH monolayers are invariably poorly organized at the molecular level.",
author = "G. Fonder and F. Cecchet and A. Peremans and P.A. Thiry and J. Delhalle and Z. Mekhalif",
year = "2009",
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volume = "603",
pages = "2276--2282",
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T1 - Conformational order of n-dodecanethiol and n-dodecaneselenol monolayers on polycrystalline copper investigated by PM-IRRAS and SFG spectroscopy

AU - Fonder, G.

AU - Cecchet, F.

AU - Peremans, A.

AU - Thiry, P.A.

AU - Delhalle, J.

AU - Mekhalif, Z.

PY - 2009/8/1

Y1 - 2009/8/1

N2 - Self-assembled monolayers (SAMs) of n-dodecanethiol (CHSH) and n-dodecaneselenol (CHSeH) on polycrystalline copper have been elaborated with the purpose of achieving densely packed and crystalline-like assemblies. By combining the surface sensitivity of polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation spectroscopy (SFG), the effect of the self-assembly time (15 min, 30 min, 1 h, 2 h and 24 h) on the formation of n-dodecanethiol and n-dodecaneselenol monolayers on untreated and electrochemically reduced polycrystalline copper has been investigated. On electrochemically reduced copper, PM-IRRAS spectroscopy shows that both molecules are able to form well organized layers. SFG spectroscopy indicates that the CHSeH SAMs are slightly better ordered than those achieved with CHSH. On untreated copper, the two molecules lead to different film organizations. Both PM-IRRAS and SFG indicate that CHSH SAMs are of the same film quality as those obtained on electrochemically reduced copper. On the contrary, CHSeH monolayers are invariably poorly organized at the molecular level.

AB - Self-assembled monolayers (SAMs) of n-dodecanethiol (CHSH) and n-dodecaneselenol (CHSeH) on polycrystalline copper have been elaborated with the purpose of achieving densely packed and crystalline-like assemblies. By combining the surface sensitivity of polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation spectroscopy (SFG), the effect of the self-assembly time (15 min, 30 min, 1 h, 2 h and 24 h) on the formation of n-dodecanethiol and n-dodecaneselenol monolayers on untreated and electrochemically reduced polycrystalline copper has been investigated. On electrochemically reduced copper, PM-IRRAS spectroscopy shows that both molecules are able to form well organized layers. SFG spectroscopy indicates that the CHSeH SAMs are slightly better ordered than those achieved with CHSH. On untreated copper, the two molecules lead to different film organizations. Both PM-IRRAS and SFG indicate that CHSH SAMs are of the same film quality as those obtained on electrochemically reduced copper. On the contrary, CHSeH monolayers are invariably poorly organized at the molecular level.

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