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In some hospitals, electronic patches are already used to monitor body functions without the need for cables. But these devices, although light and flexible, are still external. What if they could be printed directly on the skin, like a temporary tattoo, without heat, without pain and using only an LED light? This is not a futuristic concept, but a real technology that has just been developed by an international team of scientists, and that promises to revolutionize the interface between electronics and the human body.
The study, published in Angewandte Chemiedescribes a method that allows manufacturing conductive electrodes on living surfaces using only visible light and water. The technique does not require toxic chemicals or expensive equipment. In fact, the researchers managed to print sensors directly on the skin of anesthetized mice, demonstrating that the technology not only works, but also improves the quality of the recorded brain signals. The advance is technical, but its implications are deeply human: electronics that adapt to the body, not the other way around.
A new class of polymers to create circuits in the body
Researchers have developed a type of monomer called EEE-COONawhich transforms into a conductive polymer when exposed to blue light. Unlike other similar materials, this process does not require chemical initiators, metal catalysts or organic solvents. Everything happens in water and under soft lightinglike that of an LED desk lamp.
This process, known as photoinduced polymerization in aqueous mediumgives rise to a material called PEDOT-COONawhich has an excellent capacity to transport both electrons and ions. This makes it an ideal candidate for bioelectronic applications, as it can efficiently communicate with living tissues. As the study highlights, “The resulting materials exhibit world-class electrical, electrochemical and device properties, along with exceptional compatibility with flexible and biological surfaces.”.
Electronic circuits printed with light… and on living skin
One of the most striking experiments of the work was the direct printing of conductive patterns on the skin of live miceusing a solution of the monomer and a polymer mask as a guide. By applying the LED light to the skin covered with the solution, the polymer formed and adhered to the skin surface, without the need for heat or further treatment.
The printed electrodes were used to record brain signals (EEG) and the results were surprising: the signals obtained with this technology were clearer than those recorded with conventional metal electrodes. According to the authors, “Photopatterned electrodes improve the interface between the electrodes and the tissue, allowing brain signals to be recorded with higher quality”.
In addition to mice, the team demonstrated that this technology can be applied to materials such as glass and textile fabrics, which opens the door to smart clothing, wearable sensors and personalized biomedical devicesall manufactured without invasive or polluting techniques.
A clean, simple and scalable reaction
The manufacturing process is notable not only for its efficiency, but also for its simplicity and sustainability. The key is that EEE-COONa monomer is soluble in water and activated by blue light without requiring external additives. Polymerization occurs thanks to the presence of oxygen, and can be optimized with the help of antioxidants such as ascorbic acid or TEMPOL, which regulate the reaction speed and improve the conductivity of the material.
Furthermore, it was achieved that the polymer also responds to red lightby incorporating a photosensitive dye based on chlorines. This improvement is crucial because red light penetrates deeper into biological tissues, opening up the possibility of printing circuits on internal layers of the body, such as soft implants.
From a technical point of view, the conductivity values achieved are impressive: after treatment with acid, the polymer films reached 221S/cmone of the highest levels reported to date using such a benign method.
Biomedical implications: beyond the skin
The potential of this technology is not limited to sensors on the skin. Thanks to your advanced electrical properties, mechanical softness and compatibility with living tissuespolymers created through this method can be integrated into bioelectronic devices such as electrochemical transistors (OECTs), neural stimulation systems or portable diagnostic platforms.
The transistors made in this study showed excellent electrical response, even when activated by red light. This means they could be used in internal or deep tissues, where blue light does not easily reach. They also withstood stability tests under electrical pulses, suggesting that they are Robust and durable materials for real clinical applications.
As the authors conclude, “This strategy enables scalable manufacturing of organic electronics and highlights its potential for bioelectronic applications.as demonstrated by functional EEG recordings in anesthetized animals.”
An open door to truly human electronics
The deepest value of this technology lies not only in its technical sophistication, but in its ability to adapt to the human body without harming it. By eliminating harsh chemicals, reducing process temperatures, and using soft, tissue-compatible materials, scientists have taken a crucial step toward a electronics that do not impose their form, but follow that of the body.
The fact that all this is achieved with common visible light, in an aqueous medium and without toxic components, marks a milestone in the history of bioelectronics. This advance could lead us to a future where The sensors are not placed on the body, but are printed directly on itwithout pain, without risks and with surgical precision.
The combination of clean technology, biocompatible materials and functional devices opens possibilities in both personalized medicine and wearable electronics. From cardiac monitoring to neuroprosthetics, from early disease detection to cognitive training, the range of applications is as broad as it is promising.
References
- Tobias Abrahamsson, Fredrik Ek, Rémy Cornuéjols, Donghak Byun, Marios Savvakis, Cecilia Bruschi, Ihor Sahalianov, Eva Miglbauer, Chiara Musumeci, Mary J. Donahue, Ioannis Petsagkourakis, Maciej Gryszel, Martin Hjort, Jennifer Y. Gerasimov, Glib Baryshnikov, Renee Kroon, Daniel T. Simon, Magnus Berggren, Ilke Uguz, Roger Olsson and Xenofon Strakosas. Visible-Light-Driven Aqueous Polymerization Enables in Situ Formation of Biocompatible, High-Performance Organic Mixed Conductors for Bioelectronics. Angewandte ChemieNovember 10, 2025. https://doi.org/10.1002/ange.202517897.
