Surface nanostructuring of biocompatible polymer for wettability control in MEMS

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Title: Surface nanostructuring of biocompatible polymer for wettability control in MEMS
Author: Teh, K.; Lu, Yen-Wen
Abstract: We present a low-potential method to control surface roughness of doped polypyrrole through redox-induced transformation in surface morphology. By varying the electric potential of as-deposited doped polypyrrole in aqueous sodium dodecylbenzene sulfonate (0.1M) from -0.6 to +1.5V (vs. Ag/AgCl), doped polypyrrole transforms from being a hydrophilic film (60° contact angle) to a hydrophobic film (107° contact angle). Atomic force microscope measurements verify that the surface morphologies of doped polypyrrole, when subject to applied potentials from -0.6V to +1.5V, change from smooth (average roughness of 3.1 nm) to rough (average roughness of 31.1 nm), representing a 10-fold increase in surface roughness. Based on these evidence, we postulate that the degree of oxidation strongly influence surface roughness.
Record URI: http://hdl.handle.net/1850/11337
Date: 2008-01

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