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Control of MXenes' electronic properties through termination and intercalation
James L Hart1, Kanit Hantanasirisakul1,2, Andrew C Lang1
1Department of Materials Science & Engineering, Drexel University, Philadelphia, PA, 19104, USA.
Nature Communications
|February 2, 2019
Summary
Researchers enhanced the conductivity of MXenes (2D materials) by removing surface terminations. This surface engineering also enabled transitions between metallic and semiconductor behavior, paving the way for advanced electronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- MXenes are highly conductive 2D materials with applications in shielding, sensing, and energy storage.
- Improving MXenes' electronic conductivity is crucial for enhancing their performance.
- Surface chemistry significantly impacts MXenes' electronic properties, including conductivity.
Purpose of the Study:
- To investigate the correlation between MXene surface de-functionalization and electronic conductivity.
- To explore the effects of intercalation on MXene transport properties.
- To lay the groundwork for engineering advanced MXene materials.
Main Methods:
- In situ vacuum annealing within a transmission electron microscope (TEM).
- Electrical biasing and spectroscopic analysis inside the TEM.
- Investigating inter-flake effects induced by intercalation.
Main Results:
- Direct correlation established between MXene surface de-functionalization and increased electronic conductivity.
- Demonstrated transitions between metallic and semiconductor-like transport via intercalation.
- Observed changes in temperature dependence of resistance indicating transport transitions.
Conclusions:
- Surface de-functionalization is an effective strategy to boost MXene electronic conductivity.
- Intercalation can tune MXene transport properties, enabling metallic or semiconductor-like behavior.
- Findings pave the way for novel semiconducting, magnetic, and topological MXenes.
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