Screening model for nanowire surface-charge sensors in liquid

Details Screening model for nanowire surface-charge sensors in liquid Screening model for nanowire surface-charge sensors in liquid

2007-08-15

arxiv.org/abs/0708.2001v2

Appl. Phys. Lett. 91, 102105 (2007).

Physics

Condensed Matter

Soft Condensed Matter

4 pages including 2 figures. Accepted for APL

Scientific paper

10.1063/1.2779930

The conductance change of nanowire field-effect transistors is considered a highly sensitive probe for surface charge. However, Debye screening of relevant physiological liquid environments challenge device performance due to competing screening from the ionic liquid and nanowire charge carriers. We discuss this effect within Thomas-Fermi and Debye-Huckel theory and derive analytical results for cylindrical wires which can be used to estimate the sensitivity of nanowire surface-charge sensors. We study the interplay between the nanowire radius, the Thomas-Fermi and Debye screening lengths, and the length of the functionalization molecules. The analytical results are compared to finite-element calculations on a realistic geometry.

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