Imagine a world where tiny electronic eyes can see in the dark, revolutionizing everything from self-driving cars to healthcare wearables. But here's where it gets groundbreaking: researchers at KAIST have just unveiled a game-changing technology that could make these 'e-eyes' smaller, more versatile, and eco-friendly than ever before. And this is the part most people miss—they’ve achieved it using room-temperature 3D printing, a method that could reshape the future of electronics.
The Korea Advanced Institute of Science and Technology (KAIST) announced on November 3rd a breakthrough in infrared sensor technology. Led by Professor Ji Tae Kim of the Department of Mechanical Engineering, and in collaboration with Professor Soong Ju Oh of Korea University and Professor Tianshuo Zhao of the University of Hong Kong, the team has developed the world’s first room-temperature 3D printing technique capable of creating ultra-small infrared sensors—smaller than 10 micrometers (µm)—in custom shapes and sizes. These sensors are the 'eyes' behind technologies like LiDAR for autonomous vehicles, 3D face recognition in smartphones, and advanced healthcare devices.
Infrared sensors are critical for converting invisible infrared signals into electrical signals, enabling devices to 'see' in the dark. However, traditional semiconductor manufacturing processes, while efficient for mass production, struggle with flexibility, require high temperatures, and limit material choices. This new 3D printing method overcomes these challenges by using liquid nanocrystal inks made of metals, semiconductors, and insulators, stacked layer by layer at room temperature. This not only allows for precise customization but also reduces energy consumption and production costs.
Here’s the controversial part: While high-temperature annealing has long been considered essential for achieving optimal electrical performance in sensors, KAIST’s team bypassed this step entirely. Instead, they employed a 'ligand-exchange' process, replacing insulating molecules on nanoparticle surfaces with conductive ones. This innovation not only maintains excellent performance but also opens the door to using a wider range of materials, potentially sparking debates about the future of semiconductor manufacturing.
The result? Infrared sensors thinner than one-tenth of a human hair, fabricated with unprecedented precision. Professor Ji Tae Kim emphasized, 'This technology not only pushes the boundaries of sensor miniaturization and lightweight design but also enables the creation of entirely new product forms we’ve never imagined. By reducing energy consumption, it also aligns with sustainable manufacturing practices, contributing to the long-term growth of the infrared sensor industry.'
Published in Nature Communications on October 16, 2025, under the title 'Ligand-exchange-assisted printing of colloidal nanocrystals to enable all-printed sub-micron optoelectronics' (DOI: https://doi.org/10.1038/s41467-025-64596-4), this research was supported by the Ministry of Science and ICT of Korea through various programs, including the Excellent Young Researcher Program and the National Strategic Technology Material Development Program.
Now, here’s a thought-provoking question for you: As this technology paves the way for more sustainable and customizable electronics, could it also disrupt traditional manufacturing industries? Do you think this approach will become the new standard, or will it face resistance from established methods? Share your thoughts in the comments below!
