Journal
APPLIED SURFACE SCIENCE
Volume 256, Issue 9, Pages 2742-2749Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.11.020
Keywords
Thermal stability; Monolayer; Thiol; Silane; XPS; Microcontact printing
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Funding
- National Science Foundation [NSF-0425826]
- Directorate For Engineering
- Div Of Engineering Education and Centers [832785] Funding Source: National Science Foundation
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The stability of self-assembled monolayers (SAMs) at elevated temperatures is of considerable technological importance. The thermal stability of 1-octadecanethiol (ODT), 16-mercaptohexadecanoic acid (MHDA) and 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT) SAMs on gold surfaces, and of 4-aminobutyltriethoxysilane (ABTES) and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDS) assembled on hydroxylated silicon surfaces, was studied by X-ray photoelectron spectroscopy (XPS). The samples were heated in ultrahigh vacuum to temperatures in excess of that required for SAM degradation. ODT monolayers were stable to ca. 110 degrees C, while MHDA and PFDT SAMs were stable to ca. 145 degrees C. ABTES SAMs were found to be indefinitely stable to 250 degrees C, while PFDS SAMs were stable to 350 degrees C. These studies demonstrate the advantages of using silane monolayers for moderate to high temperature applications and illustrate differences that arise due to the nature of the tail group. To demonstrate the feasibility of silanes for template-directed patterning, a hydroxylated silicon oxide surface containing microcontact-printed PFDS patterns was spin-coated with a mainly hydrophilic block copolymer. Annealing the surface at 90 degrees C for 2 h caused the block copolymer to dewet the hydrophobic PFDS-patterned regions and adsorb exclusively on the unpatterned regions of the surface. (C) 2009 Elsevier B. V. All rights reserved.
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