Molybdenum Microelectrode for Bioresorbable Devices
Open AccessBioresorbable microelectrodes are the next improvement in microelectrode technology because of its ability to fully degrade when exposed to water or biofluids, preventing a patient from requiring secondary surgeries, which could lead to additional injuries and costs. In this preliminary study to eventually design a bioresorbable and transparent device, a bioresorbable microelectrode consisting of 6 µm wide grids and made with molybdenum was designed and tested for its electrochemical properties, transparency, and dissolution time. Because of this, it was determined that the most balanced parameter is a ratio of 1:20 and a thickness of 1 µm, as this ratio maintains a balance between low impedance and high transmittance while this thickness resulted in the lowest impedance with negligible effect on transmittance, resulting in an impedance and transmittance of 1060 ± 90.4 Ω and 87.8 ± 0.112%, respectively. Additionally, while the microelectrode gradually degrades, resulting in its impedance increasing and thickness decreasing as expected, it is still functional for 5 days. Lastly when compared to previously designed bioresorbable devices, the feature size of this microelectrode is significantly smaller, allowing for the use of opaque materials in optical applications and enabling future development of high density microelectrode arrays. This study resulted in a molybdenum microelectrode that is effective for both electrical recordings and optimal applications, and can function for at least 5 days after implantation.
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