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A new way to make X-rays

A new way to make X-rays | Physics | Scoop.it
MIT researchers have found a phenomenon that might lead to more compact, tunable X-ray devices made of graphene.

Via Theo J. Mertzimekis
Mikko Hakala's insight:

 

This theoretical research predics a new X-ray generation method based on confined plasmons in graphene. The concept is unique and it would be a highly advantageous method, since low-energy electrons can be used to produce tunable X-rays. In all the current approaches high-energy charged particles are needed (synchrotrons, free-electron lasers), which requires large device sizes and intensities.

 

Press release: http://news.mit.edu/2015/new-way-make-x-rays

Article: http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2015.223.html

 

X-rays are used for research and diagnostics purposes in materials and natural sciences, in engineering, and for biomedical and life sciences.

 

Note the upcoming X-ray workshop in Helsinki 3.-4.12.2015:  http://www.fsruo.fi/index.php/en/workshops-and-schools-2/fsruo2015 (public lectures)

 

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Scooped by Mikko Hakala
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Physicists discover how to change the crystal structure of graphene

Physicists discover how to change the crystal structure of graphene | Physics | Scoop.it
A University of Arizona-led team of physicists has discovered how to change the crystal structure of graphene, more commonly known as pencil lead, with an electric field, an important step toward the possible use of graphene in microprocessors that would be smaller and faster than current, silicon-based ...
Mikko Hakala's insight:

The paper shows that the stacking of graphene layers (in a 3-layer case) can be controlled with an external voltage. This way one obtains either metallic or semiconducting behavior. According to the article, for the first time such on-off switch is demonstrated in graphene.

 

This is in early stages but could become very important if the tuning of graphene's electrical properties can be realized at larger scale. The ultimate aim is a graphene-based transistor, with huge advantages compared to silicon-based ones.

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