Abstract
Thermal desorption high-resolution mass spectrometry (TD-HRMS) is examined as a characterization tool for mixed self-assembled monolayers (SAMs) on gold. TD-HRMS provides a novel spectral view of the adsorption state of thiol and dithiol on gold, and it is confirmed in this study that thiolates, not thiols, are formed on the surface of gold by chemical bonding. Mass shifts in the TD-HRMS spectra indicate the number of Au-S bonds per thiol molecule and allow the accurate identification of the molecular formula of both single and mixed SAMs. The technique is also successfully used to observe the symmetric and asymmetric dimerization between constituent molecules of the SAM on gold. TD-HRMS is shown to provide information regarding the thermal desorption behavior of mixed SAMs, with clear distinctions between chemisorbed molecules and physisorbed molecules. TD-HRMS is demonstrated to be a useful means of estimating the surface molar ratio of mixed SAMs in that the molar ratio of mixed SAMs on gold is directly reflected in the obtained molecular ion intensity of constituent alkanethiols.
| Original language | English |
|---|---|
| Pages (from-to) | 1528-1534 |
| Number of pages | 7 |
| Journal | Langmuir |
| Volume | 18 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2002 Mar 5 |
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ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
Cite this
Thermal desorption high-resolution mass spectrometry of mixed self-assembled monolayers on gold. / Shibue, Toshimichi; Nakanishi, Takuya; Matsuda, Tomoka; Asahi, Toru; Osaka, Tetsuya.
In: Langmuir, Vol. 18, No. 5, 05.03.2002, p. 1528-1534.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Thermal desorption high-resolution mass spectrometry of mixed self-assembled monolayers on gold
AU - Shibue, Toshimichi
AU - Nakanishi, Takuya
AU - Matsuda, Tomoka
AU - Asahi, Toru
AU - Osaka, Tetsuya
PY - 2002/3/5
Y1 - 2002/3/5
N2 - Thermal desorption high-resolution mass spectrometry (TD-HRMS) is examined as a characterization tool for mixed self-assembled monolayers (SAMs) on gold. TD-HRMS provides a novel spectral view of the adsorption state of thiol and dithiol on gold, and it is confirmed in this study that thiolates, not thiols, are formed on the surface of gold by chemical bonding. Mass shifts in the TD-HRMS spectra indicate the number of Au-S bonds per thiol molecule and allow the accurate identification of the molecular formula of both single and mixed SAMs. The technique is also successfully used to observe the symmetric and asymmetric dimerization between constituent molecules of the SAM on gold. TD-HRMS is shown to provide information regarding the thermal desorption behavior of mixed SAMs, with clear distinctions between chemisorbed molecules and physisorbed molecules. TD-HRMS is demonstrated to be a useful means of estimating the surface molar ratio of mixed SAMs in that the molar ratio of mixed SAMs on gold is directly reflected in the obtained molecular ion intensity of constituent alkanethiols.
AB - Thermal desorption high-resolution mass spectrometry (TD-HRMS) is examined as a characterization tool for mixed self-assembled monolayers (SAMs) on gold. TD-HRMS provides a novel spectral view of the adsorption state of thiol and dithiol on gold, and it is confirmed in this study that thiolates, not thiols, are formed on the surface of gold by chemical bonding. Mass shifts in the TD-HRMS spectra indicate the number of Au-S bonds per thiol molecule and allow the accurate identification of the molecular formula of both single and mixed SAMs. The technique is also successfully used to observe the symmetric and asymmetric dimerization between constituent molecules of the SAM on gold. TD-HRMS is shown to provide information regarding the thermal desorption behavior of mixed SAMs, with clear distinctions between chemisorbed molecules and physisorbed molecules. TD-HRMS is demonstrated to be a useful means of estimating the surface molar ratio of mixed SAMs in that the molar ratio of mixed SAMs on gold is directly reflected in the obtained molecular ion intensity of constituent alkanethiols.
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U2 - 10.1021/la010353r
DO - 10.1021/la010353r
M3 - Article
AN - SCOPUS:0037023067
VL - 18
SP - 1528
EP - 1534
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 5
ER -