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New nanomaterials for mercury replacement



graphene

Credit: Alexander Alus / Wikipedia / CC BY-SA 3.0

Nano-research team led by Helge Weman and Bjørn-Ove Fimland, director of the Norwegian University of Science and Technology's Electronic Systems (NTNU), broadcasts nanostructures from nanomaterials that emit ultraviolet light.


It is the first time anyone has created ultraviolet light on the graphene surface.

"We have shown that it is possible, which is really exciting," says Ph.D. The candidate Ida Marie Høiaas has worked on the project with a PhD. Appeal Andreas Liudi Mulyo.

"We have created a new electronic component that has the potential to become a commercial product, which is not toxic and can be cheaper, more durable and durable than today's fluorescent lamps, is much cheaper, it is easy to imagine that this device is commonly used in homes, the potential of the market it would increase significantly, "says Høiaas.

Dangerous but useful

Protecting sun exposure to UV radiation is also important, but ultraviolet light has very useful properties.

That is, especially the long UV light with 100-280 nanometers in short wavelengths, called UVC light, which is particularly useful and the ability to destroy bacteria and viruses.

Fortunately, UVC rays of the sun are trapped by ozone layers and oxygen and do not reach the Earth. But UVC is created to clean surfaces and hospital equipment or to purify water and air.

Today, the problem is that many UVC have mercury. In 2017, the United Nations Minamata Convention came into force, laying down measures to reduce mercury and reduce mercury use.

This Convention was designated as a Japanese town in the 1950s by mercury emission of a factory poisoned.

Building graphen

The graphene layer, which is placed on the glass, forms a new substrate of the new UV light emission.

Graphene has only one carbon atom layer. Researchers have helped the graphene grid to grow niobium of aluminum gallium nitride (AlGaN).

The process is carried out in a vacuum clean vacuum. In which aluminum and gallium atoms are deposited directly in the graphene substrate – with great precision and nitrogen plasma.

This process is known as molecular relief epitaxis (MBE) and is carried out in Japan, where NTNU research team collaborates with Katsumi Kishino, Sophia University of Sophia University.

Be clear

After planting the sample, it is transferred to NTNU NanoLab, because researchers make metal contacts with nickel and nickel in graphene and nanoparticles. When it emits power through the graphens and dwarves, they emit light UV.

The graphene is transparent for all wavelengths, and the light emitted from the nanoferrous crosses graphene and glass.

Høiaas says, "it's exciting to be able to combine nanomaterials in this way and be able to create LEDs for operation."

Million Dollar Market

An analysis has calculated that the UVC product market is NOK 6,000 million or approximately 700 million dollars between now and 2023. The demand for these products is expected to increase mercury by increasing mercury. 40%.

His research in NTNU with his doctorate, Høiaas is working with the same technology at the CrayoNano industrial platform. The company is a spin-off of the NTNU research group.

Use cheaper electricity

UVC LEDs for replacing fluorescent lamps are already in the market, but CrayoNano's goal is to create more energy efficient and cheaper diodes.

According to the company, today's UV LEDs are expensive because of the fact that the substrate is made of expensive aluminum nitride. Graphing is cheaper to manufacture and less material is needed for the LED diode.

More development is required

Høiaas believes that a lot of improvements are needed before the process developed at NTNU is expanded to industrial production levels. The necessary upgrades include: conductivity and energy efficiency, more advanced nanobi structures and smaller wavelengths to create UVC light.

CrayoNano has advanced, but the results have not yet been published.

"CrayoNano's goal is to market technology in 2022," says Høiaas.


Better solar cells, better LED lights and great optical possibilities


More information:
Ida Marie Høiaas and others, GaN / AlGaN Nanocrono Ultraviolet Light emitting diode Double-layer graphene uses substrate and transparent electrode Nano Letters (2019). DOI: 10.1021 / acs.nanolett.8b04607

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Norwegian University of Science and Technology

Citation:
New Nanomaterials for Mercury Replacement (2019, April 25)
It was acquired on April 25, 2019
https://phys.org/news/2019-04-nanomaterial-mercury.html

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