>> More work is needed to scan and print on heads > temporary-tattoo-like sensors > Traditional electroencephalography (EEG) systems involve time-consuming ma

>> More work is needed to scan and print on heads > temporary-tattoo-like sensors > Traditional electroencephalography (EEG) systems involve time-consuming manual electrode placement, conductive liquid gels, and cumbersome cables, which are prone to signal degradation and discomfort during prolonged use. Our approach overcomes these limitations by combining material innovations with non-contact, on-body digital printing techniques to fabricate e-tattoos that are self-drying, ultrathin, and compatible with hairy scalps. These skin-conformal EEG e-tattoo sensors enable comfortable, long-term, high-quality brain activity monitoring without the discomfort associated with traditional EEG systems. Using individual 3D head scans, custom sensor layout design, and a 5-axis microjet printing robot, we have created EEG e-tattoos with precise, tailored placement over the entire scalp. The inks for electrodes and interconnects have slightly different compositions to achieve low skin contact impedance and high bulk conductivity, respectively "On-scalp printing of personalized electroencephalography e-tattoos" (2024) https://www.cell.com/cell-biomaterials/fulltext/S3050-5623(24)00004-7 https://www.cell.com/cell-biomaterials/fulltext/S3050-5623(2... Can they be printed on a forearm like in the Disney film "Moana 2"?