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Te-125 nuclear magnetic resonance and impedance spectroscopy study of topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles
- Authors
- Choi, Dong Min; Lee, Kyu Won; Lee, Cheol Eui
- Issue Date
- 3월-2019
- Publisher
- IOP PUBLISHING LTD
- Keywords
- topological insulator Bi2Te3 nanoparticles; surface electrical properties; Te-125 nuclear magnetic resonance; impedance spectroscopy
- Citation
- MATERIALS RESEARCH EXPRESS, v.6, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS RESEARCH EXPRESS
- Volume
- 6
- Number
- 3
- ISSN
- 2053-1591
- Abstract
- We have studied topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles by means of Te-125 nuclear magnetic resonance (NMR) and impedance spectroscopy. Our Te-125 NMR lineshape measurements revealed the Knight shift of a satellite peak that increased with the mixing ratio of the Al2O3 nanoparticles, indicating that the mixing increases the surface-to-volume ratio of the Bi2Te3 nanoparticles. It is also shown that the impedance spectroscopy can be employed as a simple and effective means of distinguishing the surface electrical properties of the topological insulators in general.
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