Alkylphosphonate modified aluminum oxide surfaces

被引：106

作者：

Hoque, E. ^{[1
]}

DeRose, J. A.

Kulik, G.

Hoffmann, P.

Mathieu, H. J.

Bhushan, B.

机构：

[1] Ecole Polytech Fed Lausanne, Inst Mat, Lab Met Chim, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Sci Energie, Lab Transfert Chaleur & Masse, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne, Inst Imagerie & Opt Appl, Lab Opt Appl, CH-1015 Lausanne, Switzerland

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 22期

关键词：

D O I：

10.1021/jp061327a

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：

The surface properties of aluminum, such as chemical composition, roughness, friction, adhesion, and wear, can play an important role in the performance of micro-/nano-electromechanical systems, e.g., digital micromirror devices. Aluminum substrates chemically reacted with octadecylphosphonic acid (ODP/Al), decylphosphonic acid (DP/Al), and octylphosphonic acid (OP/Al) have been investigated and characterized by X-ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM). XPS analysis confirmed the presence of alkylphosphonate molecules on ODP/Al, DP/Al, and OP/Al. No phosphonates were found on bare Al as a control. The sessile drop static contact angle of pure water on ODP/Al and DP/Al was typically more than 115 degrees and on OP/Al typically less than 105 degrees indicating that all phosphonic acid reacted Al samples were highly hydrophobic. The root-mean-square surface roughness for ODP/Al, DP/Al, OP/Al, and bare Al was less than 15 nm as determined by AFM. The surface energy for ODP/Al and DP/Al was determined to be approximately 21 and 22 mJ/m(2), respectively, by the Zisman plot method, compared to 25 mJ/m(2) for OP/Al. ODP/Al and OP/Al were studied by friction force microscopy, a derivative of AFM, to better understand their micro-/nano-tribological properties. ODP/Al gave the lowest coefficient of friction values while bare Al gave the highest. The adhesion forces for ODP/Al and OP/Al were comparable.

引用

页码：10855 / 10861

页数：7

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