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Semimetal to semiconductor transition in Bi/TiO2core/shell nanowires
- Title
- Semimetal to semiconductor transition in Bi/TiO2core/shell nanowires
- Authors
- Kockert, M.; Mitdank, R.; Moon, Hongjae; Kim, Jeongmin; Mogilatenko, A.; Moosavi, S.H.; Kroener, M.; Woias, P.; Lee, Wooyoung; Fischer, S.F.
- DGIST Authors
- Kim, Jeongmin
- Issue Date
- 2021-01
- Citation
- Nanoscale Advances, 3(1), 263-271
- Type
- Article
- Article Type
- Article
- Keywords
- TRANSPORT-PROPERTIES; BISMUTH; STRAIN
- ISSN
- 2516-0230
- Abstract
- We demonstrate the full thermoelectric and structural characterization of individual bismuth-based (Bi-based) core/shell nanowires. The influence of strain on the temperature dependence of the electrical conductivity, the absolute Seebeck coefficient and the thermal conductivity of bismuth/titanium dioxide (Bi/TiO2) nanowires with different diameters is investigated and compared to bismuth (Bi) and bismuth/tellurium (Bi/Te) nanowires and bismuth bulk. Scattering at surfaces, crystal defects and interfaces between the core and the shell reduces the electrical conductivity to less than 5% and the thermal conductivity to less than 25% to 50% of the bulk value at room temperature. On behalf of a compressive strain, Bi/TiO2 core/shell nanowires show a decreasing electrical conductivity with decreasing temperature opposed to that of Bi and Bi/Te nanowires. We find that the compressive strain induced by the TiO2 shell can lead to a band opening of bismuth increasing the absolute Seebeck coefficient by 10% to 30% compared to bulk at room temperature. In the semiconducting state, the activation energy is determined to |41.3 ± 0.2| meV. We show that if the strain exceeds the elastic limit the semimetallic state is recovered due to the lattice relaxation. © The Royal Society of Chemistry.
- URI
- http://hdl.handle.net/20.500.11750/12949
- DOI
- 10.1039/d0na00658k
- Publisher
- Royal Society of Chemistry
- Related Researcher
-
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Kim, Jeongmin
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Research Interests
Thermoelectric Materials / Nano Materials / Charge and Heat Transport Phenomena / Transport Measurement in Low-dimensional Materials
- Files:
-
- Collection:
- Division of Nanotechnology1. Journal Articles
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