Semimetal to semiconductor transition in Bi/TiO2 core/shell nanowires
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
- Location
-
Deutsche Nationalbibliothek Frankfurt am Main
- Extent
-
Online-Ressource
- Language
-
Englisch
- Notes
-
Nanoscale advances. - 3, 1 (2021) , 263-271, ISSN: 2516-0230
- Event
-
Veröffentlichung
- (where)
-
Freiburg
- (who)
-
Universität
- (when)
-
2021
- Creator
-
Kockert, Maximilian
Mitdank, Rüdiger
Moon, Hongjae
Kim, Jeongmin
Mogilatenko, Anna
Moosavi, Seyedeh Hoda
Kröner, Michael
Woias, Peter
Lee, Wooyoung
Fischer, Saskia F.
- DOI
-
10.1039/d0na00658k
- URN
-
urn:nbn:de:bsz:25-freidok-2187493
- Rights
-
Kein Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
-
25.03.2025, 1:41 PM CET
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Kockert, Maximilian
- Mitdank, Rüdiger
- Moon, Hongjae
- Kim, Jeongmin
- Mogilatenko, Anna
- Moosavi, Seyedeh Hoda
- Kröner, Michael
- Woias, Peter
- Lee, Wooyoung
- Fischer, Saskia F.
- Universität
Time of origin
- 2021
Other Objects (12)
