Phosphonate self-assembled monolayers on aluminum surfaces

被引：99

作者：

Hoque, E ^{[1
]}

DeRose, JA

Hoffmann, P

Mathieu, HJ

Bhushan, B

Cichomski, M

机构：

[1] Ecole Polytech Fed Lausanne, LMCH, IMX, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, LTCM, ISE, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne, LOA, IOA, CH-1015 Lausanne, Switzerland

[4] Ohio State Univ, Nanotribol Lab Informat Storage & MEMS NEMS, Columbus, OH 43202 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2006年 / 124卷 / 17期

关键词：

D O I：

10.1063/1.2186311

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Substrates of aluminum (Al) deposited by physical vapor deposition onto Si substrates and then chemically reacted with perfluorodecylphosphonic acid (PFDP/Al/Si), decylphosphonic acid (DP/Al/Si), and octadecylphosphonic acid (ODP/Al/Si) were studied by x-ray photoelectron spectroscopy (XPS), contact angle measurements, atomic force microscopy (AFM), and friction force microscopy, a derivative of AFM, to characterize their surface chemical composition, roughness, and micro-/nanotribological properties. XPS analysis confirmed the presence of perfluorinated and nonperfluorinated alkylphosphonate molecules on the PFDP/Al/Si, DP/Al/Si, and ODP/Al/Si. The sessile drop static contact angle of pure water on PFDP/Al/Si was typically more than 130 degrees and on DP/Al/Si and ODP/Al/Si typically more than 125 degrees indicating that all phosphonic acid reacted Al/Si samples were very hydrophobic. The surface roughness for PFDP/Al/Si, DP/Al/Si, ODP/Al/Si, and bare Al/Si was approximately 35 nm as determined by AFM. The surface energy for PFDP/Al/Si was determined to be approximately 11 mN/m by the Zisman plot method compared to 21 and 20 mN/m for DP/Al/Si and ODP/Al/Si, respectively. Tribology involves the measure of lateral forces due to friction and adhesion between two surfaces. Friction, adhesion, and wear play important roles in the performance of micro-/nanoelectromechanical systems. PFDP/Al/Si gave the lowest adhesion and coefficient of friction values while bare Al/Si gave the highest. The adhesion and coefficient of friction values for DP/Al/Si and ODP/Al/Si were comparable.

引用

页数：6

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