2024-03-29T13:48:58Zhttps://repositori.uji.es/oai/requestoai:repositori.uji.es:10234/1508082023-12-20T17:38:28Zcom_10234_7053com_10234_9com_10234_7013col_10234_8639col_10234_8638
Repositori UJI
author
Santos, Luís P. S.
author
Cavalcante, Laécio Santos
author
Fabbro, Maria T.
author
Beltrán Mir, Héctor
author
Cordoncillo, Eloisa
author
Andres, Juan
author
Longo, Elson
2016-02-19T12:15:04Z
2016-02-19T12:15:04Z
2015-03
SANTOS, L. P. S., et al. Structural and optical properties of ZnS/MgNb 2 O 6 heterostructures. Superlattices and Microstructures, 2015, vol. 79, p. 180-192.
http://hdl.handle.net/10234/150808
http://dx.doi.org/10.1016/j.spmi.2014.12.007
In this letter, we report a simple and efficient synthetic procedure where the first step is a coprecipitation/calcination method used to obtain magnesium niobate MgNb2O6(MN) nanocrystals and in the second stage a microwave assisted hydrothermal method (MAH) is employed to synthesize zinc sulfide (ZnS) nanocrystals and ZnS/MN heterostructures. These heterostructures were characterized by X-ray diffraction (XRD), micro-Raman (MR) spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), selected area electron diffraction (SAED), energy dispersive X-ray spectrometry (EDX). XRD patterns and MR spectra indicate that MN and ZnS nanocrystals have an orthorhombic and cubic structure, respectively. FE-SEM, TEM and HR-TEM images proved the presence of aggregated MN nanocrystals, ZnS nanocrystals and the presence of ZnS nanocrystals on the surface of MN nanocrystals. Their optical properties were investigated by ultraviolet–visible spectroscopy (UV–vis) and photoluminescence (PL) measurements at room temperature. ZnS/MN heterostructures show a decrease in the values for the optical band gap with respect to both components. The presence of the ZnS nanocrystals in this heterostructure promotes a high intense PL emission.
eng
Copyright © 2014 Elsevier Ltd. All rights reserved
ZnS/MgNb2O6
Chemical synthesis
Heterostructures
Band gap
Photoluminescence
Structural and optical properties of ZnS/MgNb2O6 heterostructures
info:eu-repo/semantics/article
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