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10.3390/ma14185252
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Article

Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties

by
Katarzyna Gas
1,*,
Slawomir Kret
1,
Wojciech Zaleszczyk
1,2,
Eliana Kamińska
3,
Maciej Sawicki
1,
Tomasz Wojtowicz
2 and
Wojciech Szuszkiewicz
1,4
1
Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
2
International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
3
Institute of High Pressure Physics Unipress, Al. Prymasa Tysiaclecia 98, PL-01142 Warsaw, Poland
4
Institute of Physics, College of Natural Sciences, University of Rzeszow, S. Pigonia 1, PL-35310 Rzeszow, Poland
*
Author to whom correspondence should be addressed.
Materials 2021, 14(18), 5252; https://doi.org/10.3390/ma14185252
Submission received: 4 August 2021 / Revised: 1 September 2021 / Accepted: 7 September 2021 / Published: 13 September 2021
(This article belongs to the Special Issue Recent Advances of Spectroscopic Research on Magnetic Materials)
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Abstract

Results of comparative structural characterization of bare and Zn-covered ZnTe nanowires (NWs) before and after thermal oxidation at 300 °C are presented. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, and Raman scattering not only unambiguously confirm the conversion of the outer layer of the NWs into ZnO, but also demonstrate the influence of the oxidation process on the structure of the inner part of the NWs. Our study shows that the morphology of the resulting ZnO can be improved by the deposition of thin Zn shells on the bare ZnTe NWs prior to the oxidation. The oxidation of bare ZnTe NWs results in the formation of separated ZnO nanocrystals which decorate crystalline Te cores of the NWs. In the case of Zn-covered NWs, uniform ZnO shells are formed, however they are of a fine-crystalline structure or partially amorphous. Our study provides an important insight into the details of the oxidation processes of ZnTe nanostructures, which could be of importance for the preparation and performance of ZnTe based nano-devices operating under normal atmospheric conditions and at elevated temperatures.
Keywords: nanowires; ZnTe; ZnO; oxidation; core/shell structures; Raman scattering; transmission electron microscopy; structural analysis; semiconductors nanowires; ZnTe; ZnO; oxidation; core/shell structures; Raman scattering; transmission electron microscopy; structural analysis; semiconductors

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MDPI and ACS Style

Gas, K.; Kret, S.; Zaleszczyk, W.; Kamińska, E.; Sawicki, M.; Wojtowicz, T.; Szuszkiewicz, W. Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties. Materials 2021, 14, 5252. https://doi.org/10.3390/ma14185252

AMA Style

Gas K, Kret S, Zaleszczyk W, Kamińska E, Sawicki M, Wojtowicz T, Szuszkiewicz W. Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties. Materials. 2021; 14(18):5252. https://doi.org/10.3390/ma14185252

Chicago/Turabian Style

Gas, Katarzyna, Slawomir Kret, Wojciech Zaleszczyk, Eliana Kamińska, Maciej Sawicki, Tomasz Wojtowicz, and Wojciech Szuszkiewicz. 2021. "Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties" Materials 14, no. 18: 5252. https://doi.org/10.3390/ma14185252

APA Style

Gas, K., Kret, S., Zaleszczyk, W., Kamińska, E., Sawicki, M., Wojtowicz, T., & Szuszkiewicz, W. (2021). Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties. Materials, 14(18), 5252. https://doi.org/10.3390/ma14185252

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