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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, HongjaeKim, JeongminMogilatenko, A.Moosavi, S.H.Kroener, M.Woias, P.Lee, WooyoungFischer, S.F.
DGIST Authors
Kim, Jeongmin
Issue Date
2021-01
Citation
Nanoscale Advances, 3(1), 263-271
Type
Article
Article Type
Article
Keywords
TRANSPORT-PROPERTIESBISMUTHSTRAIN
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
  • Author Kim, Jeongmin  
  • 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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