Nano Archive

Polyelectrolyte brush amplified electroactuation of microcantilevers

Zhou, Feng and Biesheuvel, P. Maarten and Chol, Eun-Young and Shu, Wenmiao and Poetes, Rosa and Steiner, Ullrich and Huck, Wilhelm T. S. (2008) Polyelectrolyte brush amplified electroactuation of microcantilevers. NANO LETTERS, 8 (2). pp. 725-730.

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This paper describes the electroactuation of microcantilevers coated on one side with cationic polyelectrolyte brushes. We observed very strong cantilever deflection by alternating the potential on the cantilever between +0.5 and -0.5 V at frequencies up to 0.25 Hz. The actuation resulted from significant increases in the expansive stresses in the polymer brush layer at both negative and positive potentials. However, the deflection at negative bias was significantly larger. We have developed a theoretical framework that correlates conformational changes of the polymer chains in the brush layer with the reorganization of ions due to the potential bias. The model predicts a strong increase in the polymer volume fraction, close to the interface, which results in large expansive stresses that bend the cantilever at negative potentials. The model also predicts that the actuation responds much stronger to negative potentials than positive potentials, as observed in the experiments.

Item Type:Article
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanochemistry
ID Code:503
Deposited On:04 Dec 2008 13:10
Last Modified:06 Jan 2009 09:30

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