التفاصيل البيبلوغرافية
| العنوان: |
Mechanical properties of alkanethiol monolayers studied by force spectroscopy. |
| المؤلفون: |
Oncins, Gerard, Vericat, Carolina, Sanz, Fausto |
| المصدر: |
Journal of Chemical Physics; 1/28/2008, Vol. 128 Issue 4, p044701, 9p, 1 Diagram, 3 Charts, 5 Graphs |
| مصطلحات موضوعية: |
MONOMOLECULAR films, SPECTRUM analysis, HYDROCARBONS, MATHEMATICAL decoupling, THIOLS |
| مستخلص: |
The mechanical properties of alkanethiol monolayers on Au(111) in KOH solution have been studied by force spectroscopy. The analysis of the vertical force versus penetration curves showed that monolayer penetration is a stepped process that combines elastic regions with sudden penetration events. The structural meaning of these events can be explained both by the creation of gauche defects on the hydrocarbon chains and by a cooperative molecular tilting model proposed by Barrena et al. [J. Chem. Phys. 113, 2413 (2000)]. The validity of these models for alkanethiol monolayers of different compactness and chain length has been discussed. The Young’s modulus (E) of the monolayers has been calculated by using a recently developed model which considers the thickness of the monolayer as a parameter, thus allowing a decoupling of the mechanical properties of the thiol layer from those of the Au(111) substrate. As a result, the calculated E values are in the range of 50–150 Pa, which are remarkably lower than those previously reported in the literature. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Chemical Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Find this article in full text from Scitation.