Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications

Kai Chun Eddie Tjon; Jie Yuan

doi:10.1016/j.electacta.2019.134638

Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications

Kai Chun Eddie Tjon
, Jie Yuan

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The size of electrodes in bio-chemical sensors has shrunk quickly in recent years. The high impedance from polarizable microelectrodes brings new challenges to the sensor design. On the other hand, non-polarizable electrodes, such as Ag/AgCl electrodes, could have lower impedance at the low bio-signal frequency band. Thin-film Ag/AgCl electrode is commonly used as reference electrode. In this work, the electrochemical processes governing the impedance profile of thin film Ag/AgCl microelectrodes are systematically studied. New models are established for circuit parameters of thin film Ag/AgCl microelectrodes based on the new findings. The models are verified extensively with impedance measurements.

Original language	English
Article number	134638
Journal	Electrochimica Acta
Volume	320
DOIs	https://doi.org/10.1016/j.electacta.2019.134638
Publication status	Published - 10 Oct 2019
Externally published	Yes

Keywords

Ag/AgCl electrode
Impedance modeling
Non-polarizable electrode
Randles equivalent circuit

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10.1016/j.electacta.2019.134638

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title = "Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications",

abstract = "The size of electrodes in bio-chemical sensors has shrunk quickly in recent years. The high impedance from polarizable microelectrodes brings new challenges to the sensor design. On the other hand, non-polarizable electrodes, such as Ag/AgCl electrodes, could have lower impedance at the low bio-signal frequency band. Thin-film Ag/AgCl electrode is commonly used as reference electrode. In this work, the electrochemical processes governing the impedance profile of thin film Ag/AgCl microelectrodes are systematically studied. New models are established for circuit parameters of thin film Ag/AgCl microelectrodes based on the new findings. The models are verified extensively with impedance measurements.",

keywords = "Ag/AgCl electrode, Impedance modeling, Non-polarizable electrode, Randles equivalent circuit",

author = "Tjon, \{Kai Chun Eddie\} and Jie Yuan",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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doi = "10.1016/j.electacta.2019.134638",

language = "English",

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T1 - Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications

AU - Tjon, Kai Chun Eddie

AU - Yuan, Jie

PY - 2019/10/10

Y1 - 2019/10/10

N2 - The size of electrodes in bio-chemical sensors has shrunk quickly in recent years. The high impedance from polarizable microelectrodes brings new challenges to the sensor design. On the other hand, non-polarizable electrodes, such as Ag/AgCl electrodes, could have lower impedance at the low bio-signal frequency band. Thin-film Ag/AgCl electrode is commonly used as reference electrode. In this work, the electrochemical processes governing the impedance profile of thin film Ag/AgCl microelectrodes are systematically studied. New models are established for circuit parameters of thin film Ag/AgCl microelectrodes based on the new findings. The models are verified extensively with impedance measurements.

AB - The size of electrodes in bio-chemical sensors has shrunk quickly in recent years. The high impedance from polarizable microelectrodes brings new challenges to the sensor design. On the other hand, non-polarizable electrodes, such as Ag/AgCl electrodes, could have lower impedance at the low bio-signal frequency band. Thin-film Ag/AgCl electrode is commonly used as reference electrode. In this work, the electrochemical processes governing the impedance profile of thin film Ag/AgCl microelectrodes are systematically studied. New models are established for circuit parameters of thin film Ag/AgCl microelectrodes based on the new findings. The models are verified extensively with impedance measurements.

KW - Ag/AgCl electrode

KW - Impedance modeling

KW - Non-polarizable electrode

KW - Randles equivalent circuit

UR - https://www.scopus.com/pages/publications/85070199894

U2 - 10.1016/j.electacta.2019.134638

DO - 10.1016/j.electacta.2019.134638

M3 - Article

AN - SCOPUS:85070199894

SN - 0013-4686

VL - 320

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 134638

ER -

Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications

Abstract

Keywords

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