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Tailoring InSb Nanowires for High Thermoelectric Performance Using AAO Template-Assisted Die Casting Process
Alangadu Kothandan Vivekanandan1, Chen-Wei Lee1, Rui-Zhe Wu1
1Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Nanomaterials (Basel, Switzerland)
|June 24, 2022
Summary
We developed a simple method to create indium antimonide (InSb) nanowires using a vacuum die-casting technique. Surface modification of these nanowires significantly boosted their thermoelectric performance by 50%.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Indium antimonide (InSb) is a promising semiconductor material for thermoelectric applications.
- Efficient fabrication methods for high-quality InSb nanowires are crucial for device development.
- Controlling nanowire structure and properties is key to optimizing thermoelectric performance.
Purpose of the Study:
- To demonstrate a facile technique for fabricating one-dimensional InSb nanowires.
- To investigate the influence of anodizing electrolytes on nanowire growth and structure.
- To evaluate the thermoelectric properties of the synthesized InSb nanowires and the effect of surface modification.
Main Methods:
- Fabrication of InSb nanowires using anodic aluminium oxide (AAO) template-assisted vacuum die-casting.
- Investigation of vacuum die-casting filling mechanisms by varying AAO pore structures and electrolytes.
- Characterization using Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD).
- Measurement of thermoelectric properties (resistivity, Seebeck coefficient, thermal conductivity, ZT) using a four-electrode system.
- Surface modification of nanowires via reactive-ion etching.
Main Results:
- Successfully fabricated highly crystalline, homogeneous, and uniform InSb nanowires.
- Elucidated the zinc-blende crystal structure and c-axis preferential orientation of InSb nanowires.
- Demonstrated that anodizing electrolytes significantly influence nanowire growth and structure.
- Achieved a 50% increase in thermoelectric performance after surface modification using reactive-ion etching.
Conclusions:
- The AAO template-assisted vacuum die-casting method provides a facile route to high-quality InSb nanowires.
- Anodizing electrolytes are critical for controlling the structural integrity and growth of InSb nanowires.
- Surface modification is an effective strategy to enhance the thermoelectric performance of InSb nanowires, paving the way for advanced thermoelectric devices.
