125Te nuclear magnetic resonance and impedance spectroscopy study of topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles

Dong Min Choi; Kyu Won Lee; Cheol Eui Lee

doi:10.1088/2053-1591/aaf524

¹²⁵Te nuclear magnetic resonance and impedance spectroscopy study of topological insulator Bi₂Te₃ nanoparticles mixed with insulating Al₂O₃ nanoparticles

Dong Min Choi, Kyu Won Lee, Cheol Eui Lee

Department of Physics

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We have studied topological insulator Bi₂Te₃ nanoparticles mixed with insulating Al₂O₃ nanoparticles by means of ¹²⁵Te nuclear magnetic resonance (NMR) and impedance spectroscopy. Our ¹²⁵Te 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.

Original language	English
Article number	035019
Journal	Materials Research Express
Volume	6
Issue number	3
DOIs	https://doi.org/10.1088/2053-1591/aaf524
Publication status	Published - 2019 Mar

Keywords

Te nuclear magnetic resonance
impedance spectroscopy
surface electrical properties
topological insulator BiTe nanoparticles

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Polymers and Plastics
Metals and Alloys

Access to Document

10.1088/2053-1591/aaf524

Cite this

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title = "125Te nuclear magnetic resonance and impedance spectroscopy study of topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles",

abstract = "We have studied topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles by means of 125Te nuclear magnetic resonance (NMR) and impedance spectroscopy. Our 125Te 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.",

keywords = "Te nuclear magnetic resonance, impedance spectroscopy, surface electrical properties, topological insulator BiTe nanoparticles",

author = "Choi, {Dong Min} and Lee, {Kyu Won} and Lee, {Cheol Eui}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (Project Nos. 2016R1D1A1A09917003 and 2016R1D1A1B03931144). The Korea Basic Science Institute (KBSI) is acknowledged for the measurements. Publisher Copyright: {\textcopyright} 2018 IOP Publishing Ltd.",

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AU - Choi, Dong Min

AU - Lee, Kyu Won

AU - Lee, Cheol Eui

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (Project Nos. 2016R1D1A1A09917003 and 2016R1D1A1B03931144). The Korea Basic Science Institute (KBSI) is acknowledged for the measurements. Publisher Copyright: © 2018 IOP Publishing Ltd.

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N2 - We have studied topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles by means of 125Te nuclear magnetic resonance (NMR) and impedance spectroscopy. Our 125Te 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.

AB - We have studied topological insulator Bi2Te3 nanoparticles mixed with insulating Al2O3 nanoparticles by means of 125Te nuclear magnetic resonance (NMR) and impedance spectroscopy. Our 125Te 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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