Related Experiment Video
Updated: Nov 5, 2025
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
15.7K
Work Function Modulation of Few-Layer Graphene by Swift Heavy Ion Irradiation
P K Kasana1, Jyoti Shakya1, Tanuja Mohanty1
1School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Journal of Nanoscience and Nanotechnology
|May 13, 2021
Summary
Swift heavy ion irradiation of graphene introduces defects, altering its structure and electronic properties. This defect engineering offers a pathway to tune graphene
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene exhibits unique electronic and structural properties.
- Tailoring these properties is crucial for advanced applications.
- Swift heavy ion irradiation is a method to induce structural modifications.
Purpose of the Study:
- To investigate the structural and electronic modifications in graphene induced by swift heavy ion irradiation.
- To quantify the defect density and its correlation with material properties.
- To explore the potential for tailoring graphene's optoelectronic performance.
Main Methods:
- Chemical vapor deposited graphene was irradiated with swift heavy ions (70 MeV Ni6+).
- Raman spectroscopy was employed to analyze vibrational properties and defect density.
- X-ray diffraction (XRD) was used to study crystal structure changes.
- Atomic force microscopy (AFM) and scanning Kelvin probe microscopy (SKPM) assessed surface roughness and potential.
Main Results:
- Irradiation increased defect density, evidenced by changes in Raman D and G bands.
- Defect concentration correlated with decreased crystallite size and increased surface roughness.
- Work function and surface potential were modified by ion irradiation.
- A linear correlation was observed between work function, surface roughness, and defect concentration.
Conclusions:
- Swift heavy ion irradiation effectively modifies graphene's structure and electronic properties.
- Defect engineering in graphene can be controlled by ion fluence.
- These modifications provide a route to tailor graphene for optoelectronics device applications.
