Modification of aliphatic self-assembled monolayers by free-radical-dominant 
plasma: the role of the plasma composition

Weng, Chih-Chiang; Liao, Jiunn-Der; Wu, Yi-Te; Wang, Ming-Chen; Klauser, Ruth; Grunze, Michael; Zharnikov, Michael

doi:10.1021/la040058h

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Modification of aliphatic self-assembled monolayers by free-radical-dominant plasma: the role of the plasma composition

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Grunze, Michael
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Weng, C.-C., Liao, J.-D., Wu, Y.-T., Wang, M.-C., Klauser, R., Grunze, M., et al. (2004). Modification of aliphatic self-assembled monolayers by free-radical-dominant plasma: the role of the plasma composition. Langmuir, 20(23), 10093-10099. doi:10.1021/la040058h.

Cite as: https://hdl.handle.net/21.11116/0000-0001-AD9F-A

Abstract

Modification of octadecanethiolate self-assembled monolayers on Au by nitrogen-oxygen or argon-oxygen downstream microwave plasma with a low oxygen content (estimated below several percent) has been studied by synchrotron-based high-resolution X-ray photoelectron spectroscopy and water contact angle measurements. For both types of plasma, the primary processes were found to be the loss of conformational and orientational order and the oxidation of the alkyl matrix and headgroup-substrate interface. At the same time, the film modification occurred much faster and with different intermediates for the nitrogen plasma than for the argon plasma. The reasons for these differences are considered in terms of the different reactivities and different efficiencies of the energy transfer between the plasma constituents in these two types of plasma.