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Anton N Sidorov¹, Tanesh Bansal, P J Ouseph

¹Department of Physics, University of Louisville, Louisville, KY 40292, USA.

|April 22, 2010

Summary

We developed a novel, chemical-free method to create smooth graphene ribbons using cluster impacts and electrostatic transfer. This technique allows controlled ribbon width and tunable electrical properties for electronic applications.

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Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Graphene ribbons are crucial for next-generation electronics.
Existing fabrication methods often involve complex chemical treatments and lack precise width control.

Purpose of the Study:

To develop a novel, chemical-free technique for producing high-quality graphene ribbons.
To investigate the electrical transport properties and environmental sensitivity of these ribbons.

Main Methods:

Utilized high-velocity cluster impacts on graphite to create surface dislocation ribbons.
Employed electrostatic transferring to deposit ribbons onto a substrate.
Fabricated field-effect transistors (FETs) using the graphene ribbons.
Performed electrical measurements under varying conditions (ambient, vacuum annealing, gas exposure).

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Main Results:

Successfully produced long, narrow graphene ribbons with smooth edges without chemical etching.
Demonstrated control over ribbon width by adjusting cluster impact velocity.
Observed p-type behavior in ambient conditions, which reversed to n-type upon vacuum annealing at 180°C.
Confirmed charge transfer effects upon exposure to N2O and NH3 gases.

Conclusions:

The developed technique offers a scalable and precise method for graphene ribbon fabrication.
The tunable electrical properties and environmental sensitivity highlight the potential of these ribbons for sensor applications.
The chemical-free approach simplifies fabrication and preserves the intrinsic properties of graphene.