Researchers from MIT and Delft University have made significant progress in the realm of 3D-printed electronics, unveiling a method to fabricate resettable fuses without the use of semiconductors. This innovative approach utilizes standard 3D printers and a biodegradable, copper-doped polymer material, enabling the creation of devices that mimic the switching functions of traditional semiconductor-based transistors.
Breaking Free from Semiconductors
During the COVID-19 pandemic, the lack of semiconductor fabrication facilities contributed to a global electronics shortage. MIT’s new approach, while still far from replacing silicon-based semiconductors, could pave the way for decentralized electronics manufacturing. According to principal research scientist Luis Fernando Velásquez-García, the technology could eventually democratize access to electronics manufacturing, empowering labs, businesses, and homes to create functional electronics without the need for advanced fabrication centers.
The project, which stemmed from a previous study on magnetic coils, revealed a unique behavior in a copper-doped polymer filament. When subjected to high current, the material exhibited a sharp increase in resistance before returning to normal, a characteristic necessary for controlling electrical signals. This discovery led the team to explore 3D-printed transistors that could serve basic control functions, such as regulating electric motor speed.
A New Path for 3D-Printed Electronics
Though these devices don’t yet match the performance of silicon-based components, they offer exciting potential for simpler applications. The process also brings environmental benefits: the biodegradable material uses less energy, and the fabrication method produces less waste compared to traditional semiconductor manufacturing.
Velásquez-García and his team envision using this technique to print fully functional electronics, with future goals including the development of a magnetic motor entirely made through extrusion 3D printing. As the technology progresses, it could open up new possibilities for on-demand manufacturing in areas like space exploration, where electronics could be fabricated directly on board spacecraft.
Moving Forward in Electronics Innovation
This breakthrough demonstrates that active electronic devices can be 3D printed using conductive polymeric materials. While the technology has room to grow in terms of performance, the research marks a key step in enabling 3D-printed electronics that are easier, more sustainable, and accessible to a wider audience.
Funded in part by Empiriko Corporation, the research showcases the potential for integrating electronics into 3D-printed structures, with applications ranging from basic controls to complex mechatronics, further advancing the frontier of 3D printing innovation.
Source: news.mit.edu