4.6 Article

Optical and structural investigation of ZnO@ZnS core-shell nanostructures

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 173, Issue -, Pages 347-354

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2016.02.022

Keywords

Photoluminescence spectroscopy; Semiconductors; Crystal structure; Optical properties; Crystal growth

Funding

  1. FAPESP [2009/17752-0]
  2. FAPERGS [2031-2551/13-9SIAS]
  3. CNPq [MCT/CNPq 458452/2014-9]
  4. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/17752-0] Funding Source: FAPESP

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In the present work, are reported the experimental study of ZnO@ZnS core-shell synthesised by a microwave-assisted solvothermal (MAS) method. Some synthesis parameters such as, time, precursor concentration and temperature were fixed. In order to investigate the effect of growing shell on the structural and optical properties, the samples were grown with two different solvent (water or ethylene glycol). The characterizations were performed by X-ray diffraction, absorption spectroscopy in the UV -vis range, scanning electron microscopy, and photoluminescence spectroscopy. The results show that both ZnO and ZnS diffractions are present for all samples, however the crystallinity degree of ZnS shell are too low. The better decorations of ZnS (shell), on the ZnO (core) are obtained for ethylene glycol (EG) solvent, which is verified through FE-SEM images of ZnO@ZnS (EG). On the other hand, non morphological solvent dependence was observed for ZnO multi-wires. Also the luminescent emission for decorated system in water were more intense and leads to form a type-II band alignment for ZnO@ZnS core shell system. (C) 2016 Elsevier B.V. All rights reserved.

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