title: [In-vitro electrochemical stability evaluation of a flexible MEMS microelectrode].
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).
authors.affiliation: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Sui
authors.forename: Gang
authors.initials: G
authors.lastname: Feng
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Xinyu
authors.initials: X
authors.lastname: Chai
mesh_terms: D004563:Electrochemistry; D005137:Eye, Artificial; D008422:Materials Testing; D008839:Microelectrodes; D019736:Prostheses and Implants