[논문]Superb Mechanical Stability of n-Octadecyltriethoxysilane Monolayer Due to Direct Chemical Bonds between Silane Headgroups and Mica Surface: Part II

김성수

doi:10.13160/ricns.2010.3.2.096

Superb Mechanical Stability of n-Octadecyltriethoxysilane Monolayer Due to Direct Chemical Bonds between Silane Headgroups and Mica Surface: Part II 원문보기

조선자연과학논문집 = Journal of the chosun natural science, v.3 no.2, 2010년, pp.96 - 102

김성수 (Department of Nano-Polymer Materials Engineering, PaiChai University)

Abstract ▼ AI-Helper

It is still controversial where the improved stability of n-octadecyltriethoxysilane self-assembled monolayer (OTE SAM) on plasma-pretreated mica surface exactly originates from. To date, it has been well known that the extensive cross-polymerization between silane headgroups is a crucial factor for the outstanding mechanical strength of the monolayer. However, this study directly observed that the stability comes not only from the cross-links but also, far more importantly, from the direct chemical bonds between silane headgroups and mica surface. To observe this phenomenon, n-octadecyltrichlorosilane monolayers were self-assembled on both untreated and plasma treated mica surfaces, and their adhesion properties at various stress conditions and force profiles in pure water were investigated and compared through the use of the surface forces apparatus technique. It revealed that, in pure water, there is a substantial difference of stability between untreated and plasma treated cases and the plasma treated surface is mechanically much more stable. In particular, the protrusion behavior of the monolayer during contact repetition experiment was always observed in the untreated case, but never in the plasma treated case. It directly demonstrates that the extensive chemical bonds indeed exist between silane head-groups and plasma treated mica surface and dramatically improve the mechanical stability of the OTE monolayer-coated mica substrate.

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^[22] also identified a highly repulsive region at small separations (<20 nm) from force measurements between silylated glass surfaces by using an atomic force microscope. The authors defined that the region is an enhanced hydrodynamic repulsion that arises from the increased drainage due to the displacement of water by the spreading bubbles. In the case of plasma treated OTE SAMs in this study, a steep repulsive barrier as well as a soft jump-in after the repulsion were identified and very similar to the results from references 8 and 17, i.

제안 방법

The force measurements were carried out using a home-made Mark IV type SFA^[14,15] with two OTE coated, muscovite mica (plasma-treated or untreated) surfaces mounted as facing, crossed cylinders. The lower surface was mounted on either a flexible double cantilever spring [k~146 Nm^-1] or a stiff support [k~6.
^[4,5,13]Considering that very stable nanostructured electronic devices must operate well in vastly different environments understanding how the alkylsilane monolayer behaves in various environments is crucial in order to construct a patterned monolayer that is satisfactorily stable in a physically harsh and wet environment. Therefore, in this study, we employed a surface forces apparatus (SFA) technique to estimate the effect of stress and water on the molecular structure and mechanical stability of OTE monolayers on untreated and plasma-treated mica. It directly demonstrated that the plasma pretreatment on mica surface dramatically improves the mechanical stability of OTE SAM and the superb stability exclusively originates from extensive chemical bonds between OTE headgroups and plasma treated mica surface.

성능/효과

indicated that the monolayer film is in a crystalline like phase.^[12] Based on these mixed results, the authors concluded somewhat heterogeneous phase state of OTE-SAM, i.e., the monolayer is composed of highly packed crystalline OTE domains and interspersed tiny gaseous regions. On the other side, this conclusion also gives rise to an inevitable question as to whether the surface coverage of monolayer is always a satisfactory measure of film quality.

참고문헌 (29)

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Superb Mechanical Stability of n-Octadecyltriethoxysilane Monolayer Due to Direct Chemical Bonds between Silane Headgroups and Mica Surface: Part II 원문보기

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Superb Mechanical Stability of n-Octadecyltriethoxysilane Monolayer Due to Direct Chemical Bonds between Silane Headgroups and Mica Surface: Part II 원문보기

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