Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO2 microwires
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GHIMPU, Lidia; URSAKI, Veacheslav; PANTAZI, Aida Ghiulnare; MESTERCA, Raluca; BRINCOVEANU, Oana; SHREE, Sindu; ADELUNG, Rainer; TIGHINEANU, Ion; ENACHESCU, Marius. Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO2 microwires. In: Superlattices and Microstructures. 2018, nr. 116, pp. 64-70. ISSN 0749-6036.
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Superlattices and Microstructures
Numărul 116 / 2018 / ISSN 0749-6036

Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO2 microwires


DOI: 10.1016/j.spmi.2018.01.034
Pag. 64-70

Ghimpu Lidia1, Ursaki Veacheslav1, Pantazi Aida Ghiulnare2, Mesterca Raluca2, Brincoveanu Oana2, Shree Sindu3, Adelung Rainer3, Tighineanu Ion1, Enachescu Marius2
 
1 Ghitu Institute of Electronic Engineering and Nanotechnology of the Academy of Sciences of Moldova,
2 University Politehnica of Bucharest,
3 Institute for Material Science, Christian-Albrechts- University of Kiel
 
Disponibil în IBN: 19 martie 2018


Rezumat

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.

Cuvinte-cheie
Core/shell structures, Lattice constant, Nanostructured shell, Raman scattering and FTIR spectroscopy, Scanning transmission electron microscope, SnO2 microwire,

crystal structure, magnetron sputtering