Journal article · Preprint article
Screening model for nanowire surface-charge sensors in liquid
Nano-Bio Integrated Systems Group, Biomedical Micro Systems Section, Department of Micro- and Nanotechnology, Technical University of Denmark1
Biomedical Micro Systems Section, Department of Micro- and Nanotechnology, Technical University of Denmark2
Department of Micro- and Nanotechnology, Technical University of Denmark3
Optofluidics Theory and Similation, Department of Micro- and Nanotechnology, Technical University of Denmark4
Theoretical Nanoelectronics Group, Theory Section, Department of Micro- and Nanotechnology, Technical University of Denmark5
Theory Section, Department of Micro- and Nanotechnology, Technical University of Denmark6
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. ©2007 American Institute of Physics.
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2007 |
| Pages: | 102105 |
| ISSN: | 10773118 and 00036951 |
| Types: | Journal article and Preprint article |
| DOI: | 10.1063/1.2779930 |
| ORCIDs: | Mortensen, Asger and Brandbyge, Mads |
