Ionophore-containing siloprene membranes: direct comparison between conventional ion-selective electrodes and silicon nanowire-based field-effect transistors

Anping Cao, Marleen Mescher, Duco Bosma, Johan H. Klootwijk, Ernst J.R. Sudhölter, Louis C.P.M. de Smet

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

Siloprene-based, ion-selective membranes (ISMs) were drop-casted onto a field-effect transistor device that consisted of a single-chip array of top-down prepared silicon nanowires (SiNWs). Within one array, two sets of SiNWs were covered with ISMs, each containing two different ionophores, allowing the simultaneous sensing of K and Na ions using a flow cell. It is shown that both ions can be effectively detected in the same solution over a wide concentration range from 10-4 to 10-1 M without interference. The ISMs were also analyzed in a conventional ISE configuration, allowing a direct comparison. While the responses for K+ were similar for both sensor configurations, remarkably, the Na+ response of the ISM-covered SiNW device was found to be higher than the one of the ISE configuration. The addition of a Na+ buffering hydrogel layer between the SiO2 of the SiNW and the ISM reduced the response, showing the importance of keeping the boundary potential at the SiO2/ISM interface constant. The responses of the siloprene-covered SiNW devices were found to be stable over a period of at least 6 weeks, showing their potential as a multichannel sensor device.

Original languageEnglish
Pages (from-to)1173-1179
Number of pages7
JournalAnalytical Chemistry
Volume87
Issue number2
DOIs
Publication statusPublished - 20 Jan 2015
Externally publishedYes

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