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Doping monolayer graphene with single atom substitutions.

Hongtao Wang¹, Qingxiao Wang, Yingchun Cheng

¹Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China.

|December 6, 2011

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Controlling graphene properties for electronics requires effective doping. This study introduces a two-step method using vacancies and dopants like Platinum, Cobalt, and Indium for stable, single-atom doping.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Functionalized graphene is crucial for advanced applications like sensors and nanoelectronics.
Controlling carrier type and density via doping remains a significant challenge.

Purpose of the Study:

To develop an efficient two-step doping method for graphene.
To achieve stable, single-atom doping with various elements.

Main Methods:

Graphene vacancies created using high-energy atom/ion bombardment.
Vacancies filled with dopant elements (Pt, Co, In) in single-atom form.
In situ observation using aberration-corrected, monochromated transmission electron microscopy.

Main Results:

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Successful single-atom doping of graphene with Platinum, Cobalt, and Indium.
Demonstrated stability of dopant-vacancy complexes due to high binding energy.
In situ TEM confirmed the doping process and stability.

Conclusions:

The two-step vacancy creation and filling method is effective for graphene doping.
This technique enables precise control over graphene's electronic properties.
Stable single-atom doping opens new avenues for graphene-based devices.