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Strain-Induced Band Modulation, Work Function, and QTAIM Analysis of Surface O-Functionalized Ti2C MXene
Xiao-Hong Li1,2, Rui-Zhou Zhang1, Hong-Ling Cui1
1College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
ACS Omega
|August 4, 2020
Summary
Applying strain to Ti2CO2 MXene transforms it from a semiconductor to a metal, enhancing its power efficiency for applications in gas sensors and thermoelectric materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Functionalized MXenes, such as Ti2CO2, are promising materials for gas sensors, thermoelectric devices, and hydrogen storage.
- Understanding the effects of strain on MXene properties is crucial for optimizing their performance.
Purpose of the Study:
- To investigate the theoretical impact of strain on the electronic band structure and work function (WF) of Ti2CO2 MXene.
- To determine the stability and elastic limits of strained Ti2CO2 MXene.
Main Methods:
- First-principles calculations were employed to simulate the effects of applied strain.
- Analysis of electronic band structure, density of states, and work function was performed.
Main Results:
- Ti2CO2 MXene exhibits stability within the considered elastic limits, confirmed by negative cohesive energy (Ecoh).
- Applied strain induces a blue shift in the Ti d-state, causing a semiconductor-to-metal transition.
- A transition from an indirect to a direct band gap occurs at approximately 4% strain.
- Strain-induced reduction in work function improves the power efficiency of Ti2CO2 MXene.
Conclusions:
- Ti2CO2 MXene is a stable material whose electronic properties can be effectively tuned by strain engineering.
- Strain engineering offers a viable pathway to enhance the performance of Ti2CO2 MXene for advanced electronic and energy applications.
