Cited by 43Analytical Chemistry and SensorsNanowire Synthesis and ApplicationsElectrostatics and Colloid Interactions

Screening model for nanowire surface-charge sensors in liquid

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Sørensen, Martin Hedegård, Mortensen, Niels Asger, Brandbyge, Mads·2007·Applied Physics Letters

Abstract

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. The authors discuss this effect within Thomas-Fermi and Debye-Hückel theory and derive analytical results for cylindrical wires which can be used to estimate the sensitivity of nanowire surface-charge sensors. They 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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  1. [4]4. W. U. Wang, C. Chen, K. H. Lin, Y. Fang, and C. M. Lieber, Proc. Natl. Acad. Sci. U.S.A. 102, 3208 ͑2005͒.
  2. [11]11. N. W. Ashcroft and N. D. Mermin, Solid State Physics ͑Saunders, San Diego, 1976͒.
  3. [12]12. R. Feynman, R. B. Leighton, and M. L. Sands, The Feynman Lectures on Physics ͑Addison-Wesley, Reading, Massachusetts, 1964͒.

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Authors
Sørensen, M. H., Mortensen, N. A., & Brandbyge, M.
Affiliations
Technical University of Denmark (DK)
Venue
Applied Physics Letters
Published
2007-09-03
Volume
91
Issue
10
ISSN
  • 0003-6951 (ISSN-L)
  • 1077-3118
OpenAlex
W2017197049
Cited by
43
References
10
Citations by year
2025: 1 · 2023: 1 · 2020: 2 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 2 · 2015: 3 · 2014: 3 · 2013: 9 · 2012: 4
FWCI
1.90
Type
journal article
Language
en
Open access
Locations
  • Applied Physics Letters (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) (submittedVersion, other-oa)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Chemical Engineering › Bioengineering › Analytical Chemistry and Sensors
  • Physical Sciences › Engineering › Biomedical Engineering › Nanowire Synthesis and Applications
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Electrostatics and Colloid Interactions
Keywords
nanowire field-effect transistors, Debye screening, Thomas-Fermi approximation, Debye-Hückel theory, ionic liquids, cylindrical nanowires, sensor sensitivity, nanowire radius, liquid environment

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