TY - JOUR
T1 - Impedance characterization of silver/silver chloride micro-electrodes for bio-sensing applications
AU - Tjon, Kai Chun Eddie
AU - Yuan, Jie
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
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 - http://www.scopus.com/inward/record.url?scp=85070199894&partnerID=8YFLogxK
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 -