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The studies on surface chemical gradients are constantly gaining interest both for fundamental studies and for technological implications in materials science, nanofluidics, dewetting, and biological systems. Here we report on a new approach that is very simple and very efficient, to fabricate surface chemical gradients of alkanethiols, which combines electrochemical desorption/partial readsorption, with the withdrawal of the surface from the solution. The gradient is then stabilized by adding a complementary thiol terminated with a hydroxyl group with a chain length comparable to desorbed thiols. This procedure allows us to fabricate a chemical gradient of the wetting properties and the substrate work-function along a few centimeters with a gradient slope higher than 5°/cm. Samples were characterized by cyclic voltammetry during desorption, static contact angle, XPS analysis, and Kelvin probe. Computer …
American Chemical Society
Publication date: 
7 Oct 2014

Giulia Fioravanti, Francesca Lugli, Denis Gentili, Vittoria Mucciante, Francesca Leonardi, Luca Pasquali, Andrea Liscio, Mauro Murgia, Francesco Zerbetto, Massimiliano Cavallini

Biblio References: 
Volume: 30 Issue: 39 Pages: 11591-11598