Bioelectronics combines electronic and biological components to develop miniaturized implantable devices. In our research group, we developed different eumelanin derivatives for potential bioelectronic devices. We have found simple ways to control different functional groups in the eumelanin structure. Accordingly, eumelanin derivatives are attractive alternatives for bio-based electronic devices, such as pH sensors with high sensitivity and reproducibility that we produced, even in physiological settings . Currently, in our group, composites of eumelanin/PEDOT:PSS have been studied for application in supercapacitors (SC) and also as active layer in organic electrochemical transistors. The results show that the addition of eumelanin in PEDOT:PSS in SCs increases the specific capacitance by up to 33% in relation to the pure conductive polymer, while the application in OECTs reveals higher capacitance in the channel. Recently ionic doping using electrochemical techniques was used to increase eumelanin conductivity.
 Tehrani, Z., et al., 2D Materials 7 (2020) 024008.