Wireless Carbon-based Electrochemical Dopamine Sensor Brain Implant

The role of front-end electrode sensors for dopamine-detection brain implants is significant for the entire measurement process. The electrode material determines the sensitivity, selectivity, and longevity of the implant. Carbon-based electrode induces better dopamine adsorption due to π-interaction. We tested carbon fiber microelectrode (CFME) on a set of dopamine solution concentrations (1 mM to 0.01 mM) to determine its limit of detection and its reliability for quantitative analysis. The raw signal is processed using ∆Σ-converter and the concentration is estimated using a linear regression technique. The wireless feature is incorporated with a triple-band antenna at frequencies of 402, 902, and 2450 MHz for data communications, wireless power transmission, and switching control.