A Simple, Reproducible Approach to the Preparation of Surface-Chemical Gradients
- 10 September 2003
- journal article
- letter
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 19 (25) , 10459-10462
- https://doi.org/10.1021/la034707l
Abstract
We demonstrate a very simple and reproducible preparative approach for the fabrication of surface-chemical gradients. A surface concentration gradient of adsorbed methyl- or hydroxyl-terminated thiolates was achieved upon gradually immersing a gold-coated substrate into a very dilute thiol solution (0.0033 mM) by means of a linear-motion drive. Subsequent immersion of the substrate into the complementary thiol solution provided a hydrophobicity gradient with a large range (50° of the water-contact angle) and over a significant distance (35 mm). The self-assembled monolayer gradient produced in this way also displayed a high packing density, as demonstrated by dynamic contact-angle and X-ray photoelectron spectroscopy measurements.Keywords
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