Journal article
Low adhesion, non-wetting phosphonate self-assembled monolayer films formed on copper oxide surfaces
Ultramicroscopy, Vol.109(8), pp.1015-1022
2009
Handle:
https://hdl.handle.net/2376/105009
PMID: 19361929
Abstract
Self-assembled monolayer (SAM) films have been formed on oxidized copper (Cu) substrates by reaction with 1H,1H,2H,2H-perfluorodecylphosphonic acid (PFDP), octadecylphosphonic acid (ODP), decylphosphonic acid (DP), and octylphosphonic acid (OP) and then investigated by X-ray photoelectron spectroscopy (XPS), contact angle measurement (CAM), and atomic force microscopy (AFM). The presence of alkyl phosphonate molecules, PFDP, ODP, DP, and OP, on Cu were confirmed by CAM and XPS analysis. No alkyl phosphonate molecules were seen by XPS on unmodified Cu as a control. The PFDP/Cu and ODP/Cu SAMs were found to be very hydrophobic having water sessile drop static contact angles of more than 140°, while DP/Cu and OP/Cu have contact angles of 119° and 76°, respectively. PFDP/Cu, ODP/Cu, DP/Cu, and OP/Cu SAMs were studied by friction force microscopy, a derivative of AFM, to better understand their micro/nanotribological properties. PFDP/Cu, ODP/Cu, and DP/Cu had comparable adhesive force, which is much lower than that for unmodified Cu. ODP/Cu had the lowest friction coefficient followed by PFDP/Cu, DP/Cu, and OP/Cu while unmodified Cu had the highest. XPS data gives some indication that a bidentate bond forms between the alkyl phosphonate molecules and the oxidized Cu surface. Hydrophobic phosphonate SAMs could be useful as corrosion inhibitors in micro/nanoelectronic devices and/or as promoters for anti-wetting, low adhesion surfaces.
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Details
- Title
- Low adhesion, non-wetting phosphonate self-assembled monolayer films formed on copper oxide surfaces
- Creators
- E Hoque - Department of Chemistry and Materials Science Program, Washington State University, Pullman, WA 99164-4630, USAJ.A DeRose - Laboratory of Corrosion and Materials Integrity, Abt. 136, EMPA, Überlandstrasse 129, CH-8600 Dübendorf, SwitzerlandB Bhushan - Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB2), Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210, USAK.W Hipps - Department of Chemistry and Materials Science Program, Washington State University, Pullman, WA 99164-4630, USA
- Publication Details
- Ultramicroscopy, Vol.109(8), pp.1015-1022
- Academic Unit
- Chemistry, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900546554001842
- Language
- English
- Resource Type
- Journal article