Gas Katarzyna, Kret Slawomir, Zaleszczyk Wojciech, Kamińska Eliana, Sawicki Maciej, Wojtowicz Tomasz, Szuszkiewicz Wojciech
Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
Materials (Basel). 2021 Sep 13;14(18):5252. doi: 10.3390/ma14185252.
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.
本文展示了裸露的和覆盖锌的碲化锌纳米线（NWs）在300°C热氧化前后的结构表征对比结果。扫描电子显微镜、能量色散X射线光谱、高分辨率透射电子显微镜和拉曼散射不仅明确证实了纳米线外层转化为氧化锌，还展示了氧化过程对纳米线内部结构的影响。我们的研究表明，在氧化之前在裸露的碲化锌纳米线上沉积薄锌壳可以改善所得氧化锌的形态。裸露的碲化锌纳米线氧化会导致形成分离的氧化锌纳米晶体，这些晶体装饰着纳米线的晶体碲核。对于覆盖锌的纳米线，会形成均匀的氧化锌壳，然而它们具有细晶结构或部分为非晶态。我们的研究为碲化锌纳米结构氧化过程的细节提供了重要见解，这对于在正常大气条件和高温下运行的碲化锌基纳米器件的制备和性能可能具有重要意义。
