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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
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Metallic one-dimensional heterostructure for gas molecule sensing.
Prabal Dev Bhuyan1,2, Sanjeev K Gupta3, Rajeev Ahuja4,5
1Computational Materials and Nanoscience Group, Department of Physics and Electronics, St. Xavier's College, Ahmedabad, 380009, India.
Scientific Reports
|January 12, 2021
Summary
New metallic core-shell nanowires made of silicon/germanium and palladium/platinum show tunable electronic and optical properties. These nanowires are promising for nano-electronic devices and gas detection applications.
Area of Science:
- Materials Science
- Nanoscience
- Condensed Matter Physics
Background:
- Metallic core-shell nanowires (NWs) offer unique electronic and optical properties.
- Silicon (Si) and Germanium (Ge) NWs with group-10 element cores (Palladium (Pd), Platinum (Pt)) represent a novel geometry.
- Understanding their behavior is crucial for advanced nano-electronic applications.
Purpose of the Study:
- To investigate the electronic and optical properties of novel Si/Ge and Pd/Pt core-shell NWs.
- To optimize NWs for potential use in nano-electronic devices and gas sensors.
- To explore the influence of diameter and environment on NW characteristics.
Main Methods:
- Density Functional Theory (DFT) calculations using GGA-PBE functional.
- Inclusion of spin-orbit interaction (SOC) for electronic structure analysis.
- Simulation of current-voltage (IV) characteristics and optical absorption spectra.
Main Results:
- Optimized NWs with diameters of 1.5 Å and 2.5 Å were studied.
- Semi-metallic behavior at 1.5 Å (GGA-PBE), metallic behavior with SOC.
- Quantum conductance increases with NW diameter.
- Optical absorption peaks shift to lower energies due to quantum confinement.
- Significant optical response changes observed in O2 and CO2 environments.
Conclusions:
- Si/Ge based metallic core/shell NWs exhibit tunable electronic and optical properties.
- These NWs show potential as electron connectors in future nano-electronic devices.
- The materials are suitable for developing nano gas detectors, particularly for O2 detection.
