Universal approach for the fabrication of Ca2+-, K+- and NO3--sensitive membrane ISFETs

P.D. van der Wal, A. van den Berg, N.F. de Rooij

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Abstract

A new method to functionalize silanol-terminated polysiloxanes is presented. The method can be used for the realization of tailor-made ion-selective membranes. A siloxane copolymer containing polar cyano groups combined with a condensation-type cross linking overcomes the earlier encountered problem of high membrane resistance. After modification of this material with methacrylate groups, a photocurable polysiloxane was obtained. Potassium- and calcium-selective ISFETs with excellent sensitivities and selectivities (log KK,i<-3.5, i=Na+, Mg2+, Ca2+-log KCa,i<-3.2, i=Na+, K+, Mg2+) could be made with this material using photolithography. Also quaternary ammonium ion-exchange groups could be coupled to the polymer using the same technique. Using this modified polysiloxane we have been able to realize nitrate-sensitive ISFETs with a slope of 57-58 mV/decade, and a selectivity versus Cl- of log KNO3, Cl=-2.

Original languageEnglish
Pages (from-to)200-207
Number of pages8
JournalSensors and Actuators: B. Chemical
Volume18
Issue number1-3
DOIs
Publication statusPublished - Mar 1994
Externally publishedYes

Fingerprint

Ion sensitive field effect transistors
Siloxanes
polysiloxanes
Silicones
membranes
Membranes
Fabrication
fabrication
selectivity
Ion selective membranes
siloxanes
Photolithography
photolithography
Potassium
Methacrylates
nitrates
calcium
Condensation
Calcium
Nitrates

Cite this

@article{e701e510300c4522ab73ab2ec70465de,
title = "Universal approach for the fabrication of Ca2+-, K+- and NO3--sensitive membrane ISFETs",
abstract = "A new method to functionalize silanol-terminated polysiloxanes is presented. The method can be used for the realization of tailor-made ion-selective membranes. A siloxane copolymer containing polar cyano groups combined with a condensation-type cross linking overcomes the earlier encountered problem of high membrane resistance. After modification of this material with methacrylate groups, a photocurable polysiloxane was obtained. Potassium- and calcium-selective ISFETs with excellent sensitivities and selectivities (log KK,i<-3.5, i=Na+, Mg2+, Ca2+-log KCa,i<-3.2, i=Na+, K+, Mg2+) could be made with this material using photolithography. Also quaternary ammonium ion-exchange groups could be coupled to the polymer using the same technique. Using this modified polysiloxane we have been able to realize nitrate-sensitive ISFETs with a slope of 57-58 mV/decade, and a selectivity versus Cl- of log KNO3, Cl=-2.",
author = "{van der Wal}, P.D. and {van den Berg}, A. and {de Rooij}, N.F.",
year = "1994",
month = "3",
doi = "10.1016/0925-4005(94)87084-5",
language = "English",
volume = "18",
pages = "200--207",
journal = "Sensors and actuators. B: Chemical",
issn = "0925-4005",
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}

Universal approach for the fabrication of Ca2+-, K+- and NO3--sensitive membrane ISFETs. / van der Wal, P.D.; van den Berg, A.; de Rooij, N.F.

In: Sensors and Actuators: B. Chemical, Vol. 18, No. 1-3, 03.1994, p. 200-207.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Universal approach for the fabrication of Ca2+-, K+- and NO3--sensitive membrane ISFETs

AU - van der Wal, P.D.

AU - van den Berg, A.

AU - de Rooij, N.F.

PY - 1994/3

Y1 - 1994/3

N2 - A new method to functionalize silanol-terminated polysiloxanes is presented. The method can be used for the realization of tailor-made ion-selective membranes. A siloxane copolymer containing polar cyano groups combined with a condensation-type cross linking overcomes the earlier encountered problem of high membrane resistance. After modification of this material with methacrylate groups, a photocurable polysiloxane was obtained. Potassium- and calcium-selective ISFETs with excellent sensitivities and selectivities (log KK,i<-3.5, i=Na+, Mg2+, Ca2+-log KCa,i<-3.2, i=Na+, K+, Mg2+) could be made with this material using photolithography. Also quaternary ammonium ion-exchange groups could be coupled to the polymer using the same technique. Using this modified polysiloxane we have been able to realize nitrate-sensitive ISFETs with a slope of 57-58 mV/decade, and a selectivity versus Cl- of log KNO3, Cl=-2.

AB - A new method to functionalize silanol-terminated polysiloxanes is presented. The method can be used for the realization of tailor-made ion-selective membranes. A siloxane copolymer containing polar cyano groups combined with a condensation-type cross linking overcomes the earlier encountered problem of high membrane resistance. After modification of this material with methacrylate groups, a photocurable polysiloxane was obtained. Potassium- and calcium-selective ISFETs with excellent sensitivities and selectivities (log KK,i<-3.5, i=Na+, Mg2+, Ca2+-log KCa,i<-3.2, i=Na+, K+, Mg2+) could be made with this material using photolithography. Also quaternary ammonium ion-exchange groups could be coupled to the polymer using the same technique. Using this modified polysiloxane we have been able to realize nitrate-sensitive ISFETs with a slope of 57-58 mV/decade, and a selectivity versus Cl- of log KNO3, Cl=-2.

U2 - 10.1016/0925-4005(94)87084-5

DO - 10.1016/0925-4005(94)87084-5

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SP - 200

EP - 207

JO - Sensors and actuators. B: Chemical

JF - Sensors and actuators. B: Chemical

SN - 0925-4005

IS - 1-3

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