Recycled paper to create transparent and ultra-thin electronic circuits

Scientists from the University of Maryland are even closer to creating lightweight electronic devices. The team led by materials scientist Hu Liangbing combined paper-like materials and electrical connection tools to create carbon nanotubes for creating renewable electronic devices. Paper-based circuits are nothing new, but their use is often difficult because of the surface's rigidity and opacity. Electrons need to be easily shuttled between conductors and semiconductors to work properly.


The study takes advantage of the smoothness and transparency of nanopaper (transparent transistor source: ACS Nano)

To solve this problem, Hu and his team used nanofibers with a diameter of only 10 nanometers to create nanopaper. The paper is made from waste paper pulp that has been chemically oxygenated and finally formed into a transparent and completely flat piece of paper. Afterwards, the transistor is built on top of the nanopaper using three layers of material, including carbon nanotubes (non-wrinkling of nanopaper), insulating organic molecules, and semiconductor organic molecules. Then add the electrode.

The end result is a thin and light electronic material with 84% transparency and only a very small loss of performance when bent. Hu said that it will be even more efficient after reducing solvent evaporation and wrinkles in the manufacturing process. The results of this study are published in the ACS Nano journal of the American Chemical Society.

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