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UV-Promoted Exchange Reaction As A Tool For Gradual Tuning The Composition Of Binary Self-Assembled Monolayers And Chemical Lithography
Nirmalya Ballav, and Tobias Weidner, M. Zharnikov
Published 2007 · Chemistry
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We demonstrate that exchange reaction between a primary self-assembled monolayer (SAM) and a potential molecular substituent, capable to form SAM on the same substrate, can be promoted in a controlled way by preliminary exposure of the SAM to UV light with a suitable wavelength. Using a model system of a nonsubstituted alkanethiolate (AT) SAM as the primary film and COOH-substituted AT as the substituent, we showed that the composition of the binary mixed film formed by the UV-promoted exchange reaction (UVPER) can be precisely varied and tuned over the entire concentration range by the selection of a proper UV exposure time. The reason for the promotion effect of the UV light treatment is the appearance of chemical and structural defects in the primary film, induced by chemically active oxygen-derived species. Both the photooxidation of the thiolate tailgroups at the SAM−substrate interface and the structural and chemical defects in the aliphatic matrix promote the exchange reaction. Because both these d...
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