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Rapid progress is enabled by novel fabrication methods for adhesive electronics patches that are soft, stretchable and conform to the human skin. Yet, the ultimate functionality of such systems still depends on rigid components such as silicon chips and the largest rigid component on these systems is usually the battery. In this work, we demonstrate a quickly deployable, untethered, battery-free, ultrathin (~5\u2009\u03bcm) passive \u201celectronic tattoo\u201d that interfaces with the human skin for acquisition and transmission of physiological data. We show that the ultrathin film adapts well with the human skin, and allows an excellent signal to noise ratio, better than the gold-standard Ag\/AgCl electrodes. To supply the required energy, we rely on a wireless power transfer (WPT) system, using a printed stretchable Ag-In-Ga coil, as well as printed biopotential acquisition electrodes. The tag is interfaced with data acquisition and communication electronics. This constitutes a \u201cdata-by-request\u201d system. By approaching the scanning device to the applied tattoo, the patient\u2019s electrophysiological data is read and stored to the caregiver device. The WPT device can provide more than 300\u2009mW of measured power if it is transferred over the skin or 100\u2009mW if it is implanted under the skin. As a case study, we transferred this temporary tattoo to the human skin and interfaced it with an electrocardiogram (ECG) device, which could send the volunteer\u2019s heartbeat rate in real-time via Bluetooth.<\/jats:p>","DOI":"10.1038\/s41598-020-62097-6","type":"journal-article","created":{"date-parts":[[2020,3,26]],"date-time":"2020-03-26T11:03:00Z","timestamp":1585220580000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":86,"title":["Fully Untethered Battery-free Biomonitoring Electronic Tattoo with Wireless Energy Harvesting"],"prefix":"10.1038","volume":"10","author":[{"given":"Jos\u00e9","family":"Alberto","sequence":"first","affiliation":[]},{"given":"Cristina","family":"Leal","sequence":"additional","affiliation":[]},{"given":"Cl\u00e1udio","family":"Fernandes","sequence":"additional","affiliation":[]},{"given":"Pedro A.","family":"Lopes","sequence":"additional","affiliation":[]},{"given":"Hugo","family":"Paisana","sequence":"additional","affiliation":[]},{"given":"An\u00edbal T.","family":"de Almeida","sequence":"additional","affiliation":[]},{"given":"Mahmoud","family":"Tavakoli","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,3,26]]},"reference":[{"key":"62097_CR1","doi-asserted-by":"publisher","unstructured":"Haahr, R. 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