Lasers tailor graphene for new electronics technology

August 6, 2015 by Ivan Bobrinetskiy
Lasers tailor graphene to brand-new technology in electronics
Credit: AIMEN

Carbon nanomaterials display extraordinary physical properties, outstanding among any other substance available, and graphene has grown as the most promising material for brand-new electronic circuitry, sensors and optical communications devices. Graphene is a single atom-thick sheet of honeycomb carbon lattice, with unique electronic and optical properties, which could bring a new era of fast, reliable, low power communication and information processing.

But two problems hinder graphene´s uptake in real world electronics. There is no large-scale technology to control its properties, and the traditional technology used for silicon-based processors (solid state) is not suitable for graphene processing (molecular material).

The researchers from Technological Center AIMEN explore the use of ultrafast lasers as tools for graphene processing. The can be focused precisely to tailor the properties of graphene films in finely defined areas to produce distinct behaviors useful for producing devices.

The key is the use of short, highly controlled , which induce chemical changes in the carbon lattice. A single pulse of laser with a duration of several picoseconds is enough—the duration of a single oscillation in a polar molecule, like water. At this timescale, researchers demonstrated that they can pattern graphene lattices by cutting, adding external molecules or binding compounds (functional groups like oxygen or hydroxyl). As the laser spot can be focused in an area of one square micron or less, direct writing of devices on graphene can be achieved with high precision, producing nano-devices with minimal footprint and maximum efficiency.

As recently published in AIP Applied Physics Letters (Patterned graphene ablation and two-photon functionalization by picosecond laser pulses in ambient conditions), the work of AIMEN researchers demonstrated laser-based, large-scale patterning of graphene at high speed and resolution, opening new possibilities for device making. The speed of the process can be higher than one m/s for drawing the micrometer-sized features. Processing speeds over 10 m/s could be attained using advanced optical scanning.

Lasers tailor graphene to brand-new technology in electronics
Credit: AIMEN

Moreover, the work demonstrated the control of the thermal and chemical processes by adjusting laser beam characteristics. For low energy inputs, multiphoton absorption plays a major role, inducing chemical reactions between carbon and atmosphere molecules, resulting in new optical properties in graphene.

The potential of the altered (like spectral transmission) of functionalized graphene are newly recognized, and the full industrial potential of this technology needs to be tackled. This research lays a foundation for deeper understanding of the chemical and physical processes for industrially feasible patterning, as well as tests for real device applications for future electronics.

Explore further: Researchers make magnetic graphene

More information: "Patterned graphene ablation and two-photon functionalization by picosecond laser pulses in ambient conditions." Appl. Phys. Lett. 107, 043104 (2015);

Related Stories

Researchers make magnetic graphene

January 26, 2015

Graphene, a one-atom thick sheet of carbon atoms arranged in a hexagonal lattice, has many desirable properties. Magnetism alas is not one of them. Magnetism can be induced in graphene by doping it with magnetic impurities, ...

Researchers learn to control graphene with lasers

June 3, 2015

New numerical simulations by Berkeley Lab Alvarez Fellow Alexander Kemper and his colleagues at Stanford University reveal how the quantum properties of graphene can be manipulated at ultrafast timescales with femtosecond ...

Parity effect observed in graphene

August 4, 2015

Researchers have theoretically projected and successfully proven through experimentation the parity effect of the quantum Hall edge transport in graphene antidot devices with pn junctions (PNJs). Graphine, or single-layered ...

Recommended for you

Nano-watermark sorts fakes from genuines

June 27, 2016

Nanoga, an EPFL-based startup, has developed a technique to put a nanoscopic watermark onto glass or ceramic. Products with this watermark, which is invisible to the naked eye and only shows up under ultraviolet light, are ...

Hybrid nanogenerator harvests hard-to-reach ocean energy

June 21, 2016

(—Energy from the ocean, or "blue energy," is arguably the most underexploited power source, according to researchers in a new study. Although the oceans contain enough energy to meet all of the world's energy ...

Nanoscientists develop the 'ultimate discovery tool'

June 23, 2016

The discovery power of the gene chip is coming to nanotechnology. A Northwestern University research team is developing a tool to rapidly test millions and perhaps even billions or more different nanoparticles at one time ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.