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Inkjet printers print finished electronic devices

26.02.2003

At the University of California at Berkeley (USA), a group of researchers led by D. Canny is developing a new technology for printing finished electronic devices using inkjet printers.

Even now, they can print individual radio-electronic components layer by layer from polymeric materials: transistors, capacitors, inductors, etc. The next step could be making more complex devices, such as TV remote controls. Polymers with piezoelectric properties would be used to print remote control buttons.

There are also no fundamental obstacles in order to make an infrared LED and other elements of the electronic circuit of the remote control from polymers, except for batteries. The advantage of the promising technology is the low cost of manufactured products, since installation work is almost completely eliminated in this case.

However, there are also disadvantages. Thus, in terms of their electrical characteristics, polymer electronic components are currently inferior to products based on silicon and other semiconductors. In addition, products made using the new technology will be completely unrepairable, and in the event of any descendants, they can only be thrown into the trash.

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Eternal paint based on plasmonic pixels 04.06.2016

A team of researchers from the University of Melbourne has developed a paint made from metal nanoparticles - plasmonic pixels - that will never fade in the sun.

A plasmonic pixel is a very small piece of metal. There are many very mobile electrons in any metal, and when light acts on a metal nanoparticle, the photon energy slightly shifts the electrons away from their nuclei, creating negative and positive poles for a short time. The forces of Coulomb attraction bring the electrons back into place. This process is repeated countless times and is called plasmon resonance. It causes the nanoparticles (and the material made from them) to absorb electromagnetic waves with certain characteristics - due to this, the material from the plasmonic pixels acquires a color visible to the eye.

The use of plasmonic pixels as a coloring agent has so far encountered a number of difficulties - in particular, the number of colors available was limited, and there was also no way to give a pixel a permanent specific color.

The new plasmonic pixel format allows you to create more than 2000 colors and shades. Scientists used tiny antennas made of aluminum: the distance between them determines the saturation of the color, and the hue is determined by the length of the antenna. With the size, too, everything is getting better: we managed to make a picture with a size of 1,5 x 1,5 cm - this is much more than similar techniques allowed before. And the resolution of the image is so high that the human eye cannot see the distance between the pixels.

Eternal paint based on plasmonic pixels can be used to paint cars, buildings and other large surfaces.

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