Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates

Laurent Dreesen, Cedric Volcke, Yannick Sartenaer, André Peremans, Paul Thiry, Christophe Humbert, Jérôme Grugier, Jacqueline Marchand-Brynaert

Research output: Contribution to journalArticle

Abstract

In a recent paper Ciszek et al. [J.W. Ciszek, M.P. Stewart, J.M. Tour, J. Am. Chem. Soc. 126 (2004) 13172] showed that organic thiocyanates may be an interesting alternative to the use of thiols for thiolate assemblies. We use scanning tunnelling microscopy (STM), infrared reflection absorption and sum-frequency generation spectroscopies (IRRAS and SFG) in order to study the adsorption properties of decyl thiocyanates (DTCN) and compare them to the decanethiol (DT) ones. Firstly, IRRAS measurements show that DTCN molecules form self-assembled monolayers (SAMs) on gold via a thiolate link with the metallic substrate. Secondly, the DTCN SAM on gold is less ordered than the DT one as highlighted by SFG spectroscopy. Indeed, the intensities of the methyl vibration modes vanish while the methylene ones increase when DTCN molecules are adsorbed on the substrate instead of DT. We explain the differences in SAMs quality on the basis of STM measurements which reveal differences in molecular order and packing.
Original languageEnglish
Pages (from-to)4052-4057
Number of pages6
JournalSurface Science
Volume600
Issue number18
Publication statusPublished - 2006

Fingerprint

Thiocyanates
Self assembled monolayers
Gold
scanning tunneling microscopy
Scanning tunneling microscopy
gold
infrared reflection
Substrates
thiols
methylene
Spectroscopy
assemblies
spectroscopy
molecules
vibration mode
Molecules
adsorption
Infrared radiation
Adsorption
Sulfhydryl Compounds

Keywords

  • Sum-frequency generation spectroscopy
  • Self-assembled monolayers
  • Decyl thiocyanate
  • Scanning tunnelling microscopy
  • Decanethiol

Cite this

Dreesen, L., Volcke, C., Sartenaer, Y., Peremans, A., Thiry, P., Humbert, C., ... Marchand-Brynaert, J. (2006). Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates. Surface Science, 600(18), 4052-4057.
Dreesen, Laurent ; Volcke, Cedric ; Sartenaer, Yannick ; Peremans, André ; Thiry, Paul ; Humbert, Christophe ; Grugier, Jérôme ; Marchand-Brynaert, Jacqueline. / Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates. In: Surface Science. 2006 ; Vol. 600, No. 18. pp. 4052-4057.
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Dreesen, L, Volcke, C, Sartenaer, Y, Peremans, A, Thiry, P, Humbert, C, Grugier, J & Marchand-Brynaert, J 2006, 'Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates', Surface Science, vol. 600, no. 18, pp. 4052-4057.

Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates. / Dreesen, Laurent; Volcke, Cedric; Sartenaer, Yannick; Peremans, André; Thiry, Paul; Humbert, Christophe; Grugier, Jérôme; Marchand-Brynaert, Jacqueline.

In: Surface Science, Vol. 600, No. 18, 2006, p. 4052-4057.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates

AU - Dreesen, Laurent

AU - Volcke, Cedric

AU - Sartenaer, Yannick

AU - Peremans, André

AU - Thiry, Paul

AU - Humbert, Christophe

AU - Grugier, Jérôme

AU - Marchand-Brynaert, Jacqueline

PY - 2006

Y1 - 2006

N2 - In a recent paper Ciszek et al. [J.W. Ciszek, M.P. Stewart, J.M. Tour, J. Am. Chem. Soc. 126 (2004) 13172] showed that organic thiocyanates may be an interesting alternative to the use of thiols for thiolate assemblies. We use scanning tunnelling microscopy (STM), infrared reflection absorption and sum-frequency generation spectroscopies (IRRAS and SFG) in order to study the adsorption properties of decyl thiocyanates (DTCN) and compare them to the decanethiol (DT) ones. Firstly, IRRAS measurements show that DTCN molecules form self-assembled monolayers (SAMs) on gold via a thiolate link with the metallic substrate. Secondly, the DTCN SAM on gold is less ordered than the DT one as highlighted by SFG spectroscopy. Indeed, the intensities of the methyl vibration modes vanish while the methylene ones increase when DTCN molecules are adsorbed on the substrate instead of DT. We explain the differences in SAMs quality on the basis of STM measurements which reveal differences in molecular order and packing.

AB - In a recent paper Ciszek et al. [J.W. Ciszek, M.P. Stewart, J.M. Tour, J. Am. Chem. Soc. 126 (2004) 13172] showed that organic thiocyanates may be an interesting alternative to the use of thiols for thiolate assemblies. We use scanning tunnelling microscopy (STM), infrared reflection absorption and sum-frequency generation spectroscopies (IRRAS and SFG) in order to study the adsorption properties of decyl thiocyanates (DTCN) and compare them to the decanethiol (DT) ones. Firstly, IRRAS measurements show that DTCN molecules form self-assembled monolayers (SAMs) on gold via a thiolate link with the metallic substrate. Secondly, the DTCN SAM on gold is less ordered than the DT one as highlighted by SFG spectroscopy. Indeed, the intensities of the methyl vibration modes vanish while the methylene ones increase when DTCN molecules are adsorbed on the substrate instead of DT. We explain the differences in SAMs quality on the basis of STM measurements which reveal differences in molecular order and packing.

KW - Sum-frequency generation spectroscopy

KW - Self-assembled monolayers

KW - Decyl thiocyanate

KW - Scanning tunnelling microscopy

KW - Decanethiol

M3 - Article

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SP - 4052

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JO - Surface Science

JF - Surface Science

SN - 0039-6028

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ER -

Dreesen L, Volcke C, Sartenaer Y, Peremans A, Thiry P, Humbert C et al. Comparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates. Surface Science. 2006;600(18):4052-4057.