In-vitro electrochemical stability evaluation of a flexible MEMS microelectrode.
- Author:
Yu WANG
1
;
Xiaohong SUI
;
Gang FENG
;
Gang LI
;
Xinyu CHAI
Author Information
1. School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240.
- Publication Type:Journal Article
- MeSH:
Electrochemistry;
Eye, Artificial;
Materials Testing;
Microelectrodes;
Prostheses and Implants
- From:
Chinese Journal of Medical Instrumentation
2013;37(1):6-9
- CountryChina
- Language:Chinese
-
Abstract:
Three-electrode testing method was used to investigate the effect of temperature on electrode impedance, and the pH shifts in saline solution resulting from the electrical stimulation were also determined. Experiments in PBS (phosphate buffered solution) solution showed that the electrode impedance was almost invariable at the human body temperature range (35 degrees C-40 degrees C). And the experiments in unbuffered saline solution showed that pH shifts decreased from 0.03 to 0.005 when the frequency of biphasic charged-balanced pulses increased from 1 Hz to 100 Hz. Even stimulated by monophasic pulses (frequency is 15 Hz, amplitude is 50 microA), the stimulus-induced pH shift of electrode only varies 0.15 (anodic pulse current increased 0.15 and cathodic pulse current decreased 0.15).
