Study of parasitic resistance effects in nanowire and nanoribbon biosensors

Zeimpekis, I., Sun, K., Hu, C. , Thomas, O., de Planque, M. R.R., Chong, H. M.H., Morgan, H. and Ashburn, P. (2015) Study of parasitic resistance effects in nanowire and nanoribbon biosensors. Nanoscale Research Letters, 10, 79. (doi: 10.1186/s11671-015-0794-6) (PMID:25852375) (PMCID:PMC4385057)

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Abstract

In this work, we investigate sensor design approaches for eliminating the effects of parasitic resistance in nanowire and nanoribbon biosensors. Measurements of pH with polysilicon nanoribbon biosensors are used to demonstrate a reduction in sensitivity as the sensor length is reduced. The sensitivity (normalised conductance change) is reduced from 11% to 5.5% for a pH change from 9 to 3 as the sensing window length is reduced from 51 to 11 μm. These results are interpreted using a simple empirical model, which is also used to demonstrate how the sensitivity degradation can be alleviated by a suitable choice of sensor window length. Furthermore, a differential sensor design is proposed that eliminates the detrimental effects of parasitic resistance. Measurements on the differential sensor give a sensitivity of 15%, which is in good agreement with the predicted maximum sensitivity obtained from modeling.

Item Type:Articles
Additional Information:The authors would like to acknowledge the Technology Strategy Board (TSB) and the Engineering and Physical Sciences Research Council (EPSRC: EP/K502327/1) for funding this work.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hu, Dr Chunxiao
Authors: Zeimpekis, I., Sun, K., Hu, C., Thomas, O., de Planque, M. R.R., Chong, H. M.H., Morgan, H., and Ashburn, P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nanoscale Research Letters
Publisher:Springer
ISSN:1556-276X
ISSN (Online):1556-276X
Published Online:21 February 2015
Copyright Holders:Copyright © 2015 Zeimpekis et al.
First Published:First published in Nanoscale Research Letters 10(:79
Publisher Policy:Reproduced under a creative commons license

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