Quantitative analysis of mixed self-assembled monolayers using ToF-SIMS

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The spacing of chemical functional groups on self-assembled monolayers (SAMs) plays an important role in controlling the density of biomolecules in biochips and biosensors. In this sense, a mixed SAM made of two different terminal groups is a useful organic surface since spacing can be easily controlled by changing a relative mole fraction in a mixture solution. In this study, an acetylene-OCH(2)O(EG)(3)(CH(2))(11)S-S(CH(2))(11)(EG)(3)OCH(2)O-propene (Eneyne) SAM and mixed SAMs made by a mixture of (S(CH(2))(11)(EG)(3)O-CH(2)O-acetylene)(2) (Diyne) and (S(CH(2))(11)(EG)(3)OCH(2)O-propene)(2) (Diene) were produced on gold substrates and measured by using ToF-SIMS. The secondary ion yield ratio of [Au center dot S(CH(2))(11)(EG)(3)O-11(EG)(3)OCH(2)O-acetylene] to [Au center dot S(CH(2))(11)(EG)(3)OCH(2)O-propene] was measured for each mixed SAM and plotted as a function of the mole fraction of Diyne to Diene in a SAM solution. The ion yield ratio of a mixed SAM produced from a solution with a mole fraction of 0.5 (i.e., 1:1 mixture) was 0.3, which corresponded well to the ion yield ratio measured from an Eneyne SAM. A time-dependent experiment of Eneyne SAM formation and immersion experiment of Eneyne SAM into Diyne solution or into Diene solution were performed. The relative ion yield ratio of 0.3 was due to a different secondary ion formation and not due to the difference in the amount of adsorbates on the surface, nor to the different binding strengths onto the gold surface. Our study shows that a mixed SAM with well-controlled spacing can be produced and quantified by using the ToF-SIMS technique. (C) 2008 Elsevier B. V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2008-12
Language
English
Article Type
Article; Proceedings Paper
Keywords

ION MASS-SPECTROMETRY; GOLD; SURFACE; FILMS

Citation

APPLIED SURFACE SCIENCE, v.255, no.4, pp.1037 - 1039

ISSN
0169-4332
URI
http://hdl.handle.net/10203/12932
Appears in Collection
CH-Journal Papers(저널논문)
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