Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO 2 microwires.

Ghimpu , L., Ursaki , V.V., Pantazi, A., Mesterca, R., Brâncoveanu, O., Shree, Sindu, Adelung, Rainer, Tiginyanu, I.M. and Enachescu, M. (2018) Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO 2 microwires. Superlattices and Microstructures, 116 . pp. 64-70. DOI 10.1016/j.spmi.2018.01.034.

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Supplementary data:

Abstract

We report the fabrication and characterization of SnO2/CdTe and SnO2/GaAs core/shell microstructures. CdTe or GaAs shell layers were deposited by radio-frequency (RF) magnetron sputtering on core SnO2 microwires synthesized by a flame-based thermal oxidation method. The produced structures were characterized by scanning electron microscopy (SEM), high-resolution scanning transmission electron microscope (HR-STEM), X-ray diffraction (XRD), Raman scattering and FTIR spectroscopy. It was found that the SnO2 core is of the rutile type, while the shells are composed of CdTe or GaAs nanocrystallites of zincblende structure with the dimensions of crystallites in the range of 10–20 nm. The Raman scattering investigations demonstrated that the quality of the porous nanostructured shell is improved by annealing at temperatures of 420–450 °C. The prospects of implementing these microstructures in intrinsic type fiber optic sensors are discussed.

Document Type: Article
Keywords: Core/shell structures, Magnetron sputtering, SnO2 microwire, Nanostructured shell, Crystal structure, Lattice constant, Scanning transmission electron microscope, Raman scattering and FTIR spectroscopy
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.spmi.2018.01.034
ISSN: 0749-6036
Projects: Future Ocean
Date Deposited: 31 Jul 2018 09:45
Last Modified: 13 Mar 2019 09:38
URI: http://oceanrep.geomar.de/id/eprint/43836

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