Reference-electrode free pH sensing using impedance spectroscopy

Laura  Folkertsma; Lennart Gehrenkemper; Jan Eijkel; Karin Gerritsen; Mathieu  Odijk

doi:10.3390/proceedings2130742

Reference-electrode free pH sensing using impedance spectroscopy

Laura Folkertsma, Lennart Gehrenkemper, Jan Eijkel, Karin Gerritsen, Mathieu Odijk

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

We present a reference-electrode free sensor able to measure both pH and conductivity based on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). The impedance of this electrode at low frequencies depends on its double layer capacity, which varies with pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedance is determined by the resistance in the system, which corresponds to the inverse conductivity of the solution. Because no reference electrode is needed for this technique, miniaturization of the pH sensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasma pH measurements.

Original language	English
Title of host publication	Eurosensors 2019
Subtitle of host publication	Proceedings MDPI
Number of pages	5
Volume	2
Edition	13
DOIs	https://doi.org/10.3390/proceedings2130742
Publication status	Published - 30 Nov 2018
Event	32nd European Conference on Solid-State Transducers, Eurosensors XXXII 2018 - Graz, Austria Duration: 9 Sep 2018 → 12 Sep 2018 Conference number: 32 http://www.eurosensors2018.eu

Publication series

Name	Proceedings (MDPI)
Publisher	Multidisciplinary Digital Publishing Institute
ISSN (Print)	2504-3900

Conference

Conference	32nd European Conference on Solid-State Transducers, Eurosensors XXXII 2018
Abbreviated title	Eurosensors
Country/Territory	Austria
City	Graz
Period	9/09/18 → 12/09/18
Internet address	http://www.eurosensors2018.eu

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title = "Reference-electrode free pH sensing using impedance spectroscopy",

abstract = "We present a reference-electrode free sensor able to measure both pH and conductivity based on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). The impedance of this electrode at low frequencies depends on its double layer capacity, which varies with pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedance is determined by the resistance in the system, which corresponds to the inverse conductivity of the solution. Because no reference electrode is needed for this technique, miniaturization of the pH sensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasma pH measurements.",

author = "Laura Folkertsma and Lennart Gehrenkemper and Jan Eijkel and Karin Gerritsen and Mathieu Odijk",

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AU - Folkertsma, Laura

AU - Gehrenkemper, Lennart

AU - Eijkel, Jan

AU - Gerritsen, Karin

AU - Odijk, Mathieu

N1 - Conference code: 32

PY - 2018/11/30

Y1 - 2018/11/30

N2 - We present a reference-electrode free sensor able to measure both pH and conductivity based on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). The impedance of this electrode at low frequencies depends on its double layer capacity, which varies with pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedance is determined by the resistance in the system, which corresponds to the inverse conductivity of the solution. Because no reference electrode is needed for this technique, miniaturization of the pH sensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasma pH measurements.

AB - We present a reference-electrode free sensor able to measure both pH and conductivity based on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). The impedance of this electrode at low frequencies depends on its double layer capacity, which varies with pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedance is determined by the resistance in the system, which corresponds to the inverse conductivity of the solution. Because no reference electrode is needed for this technique, miniaturization of the pH sensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasma pH measurements.

U2 - 10.3390/proceedings2130742

DO - 10.3390/proceedings2130742

M3 - Conference contribution

VL - 2

T3 - Proceedings (MDPI)

BT - Eurosensors 2019

T2 - 32nd European Conference on Solid-State Transducers, Eurosensors XXXII 2018

Y2 - 9 September 2018 through 12 September 2018

ER -

Reference-electrode free pH sensing using impedance spectroscopy

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