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Work Function Lowering of Graphite by Sequential Surface Modifications: Nitrogen and Hydrogen Plasma Treatment.
Keishi Akada1, Seiji Obata1, Koichiro Saiki1
1Department of Complexity Science and Engineering, The University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8561, Japan.
ACS Omega
|October 17, 2019
Summary
Researchers tuned graphite
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Graphite materials are crucial for devices and catalysts.
- Tuning material properties enhances applications like field emission and fuel cell catalysts.
- Work function significantly impacts device performance, necessitating tunable methods.
Purpose of the Study:
- To achieve wide-range control of graphite's work function.
- To investigate methods for tuning work function for advanced applications.
Main Methods:
- Utilized nitrogen and hydrogen plasma treatments on graphite.
- Varied hydrogen plasma treatment duration and pre-doped nitrogen atom concentration.
Main Results:
- Successfully controlled graphite's work function across a wide range (2.9 to 5.0 eV).
- Demonstrated that treatment time and nitrogen doping level are key control factors.
- Observed work function reduction attributed to surface dipole layer formation and nitrogen electron donation.
Conclusions:
- Wide-range work function control of graphite is achievable via plasma treatments.
- This tunability is beneficial for diverse applications in electronics and catalysis.
- Surface dipole formation and nitrogen doping are key mechanisms for work function modification.
