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Study of parasitic resistance effects in nanowire and nanoribbon biosensors

Study of parasitic resistance effects in nanowire and nanoribbon biosensors
Study of parasitic resistance effects in nanowire and nanoribbon biosensors
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.
1931-7573
79
Zeimpekis, Ioannis
a2c354ec-3891-497c-adac-89b3a5d96af0
Sun, Kai
2ace53c1-82cc-47e5-911e-898b143163d3
Hu, Chunxiao
4892b566-6809-42a8-8285-1c1e93aac730
Thomas, Owain
f9816700-63de-4cbf-a4dd-939ff7607fb5
de Planque, Maurits R.R.
a1d33d13-f516-44fb-8d2c-c51d18bc21ba
Chong, Harold M.H.
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ashburn, Peter
68cef6b7-205b-47aa-9efb-f1f09f5c1038
Zeimpekis, Ioannis
a2c354ec-3891-497c-adac-89b3a5d96af0
Sun, Kai
2ace53c1-82cc-47e5-911e-898b143163d3
Hu, Chunxiao
4892b566-6809-42a8-8285-1c1e93aac730
Thomas, Owain
f9816700-63de-4cbf-a4dd-939ff7607fb5
de Planque, Maurits R.R.
a1d33d13-f516-44fb-8d2c-c51d18bc21ba
Chong, Harold M.H.
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ashburn, Peter
68cef6b7-205b-47aa-9efb-f1f09f5c1038

Zeimpekis, Ioannis, Sun, Kai, Hu, Chunxiao, Thomas, Owain, de Planque, Maurits R.R., Chong, Harold M.H., Morgan, Hywel and Ashburn, Peter (2015) Study of parasitic resistance effects in nanowire and nanoribbon biosensors. Nanoscale Research Letters, 10, 79. (doi:10.1186/s11671-015-0794-6).

Record type: Article

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.

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More information

e-pub ahead of print date: 21 February 2015
Published date: 21 February 2015
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 374627
URI: https://eprints.soton.ac.uk/id/eprint/374627
ISSN: 1931-7573
PURE UUID: c49e1d1a-8b33-4789-9fa8-1e0741f84b0a
ORCID for Maurits R.R. de Planque: ORCID iD orcid.org/0000-0002-8787-0513
ORCID for Harold M.H. Chong: ORCID iD orcid.org/0000-0002-7110-5761
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 23 Feb 2015 22:15
Last modified: 20 Jul 2019 00:59

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