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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Improved photoluminescence emission and gas sensor properties of ZnO thin films

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Author(s):
Berger, D. ; de Moura, A. P. ; Oliveira, L. H. ; Bastos, W. B. ; La Porta, F. A. ; Rosa, I. L. V. ; Li, M. S. ; Tebcherani, S. M. ; Longo, E. ; Varela, J. A.
Total Authors: 10
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 42, n. 12, p. 13555-13561, SEP 2016.
Web of Science Citations: 14
Abstract

In this article, we report a comparative study of the influence of pressure-assisted (1.72 MPa) versus ambient pressure thermal annealing on both ZnO thin films treated at 330 degrees C for 32 h. The effects of pressure on the structural, morphological, optical, and gas sensor properties of these thin films were investigated. The results show that partial preferential orientation of the wurtzite-structure ZnO thin films in the {[}002] or {[}101] planes is induced based on the thermal annealing conditions used (i.e., pressure assisted or ambient pressure). UV-vis absorption measurements revealed a negligible variation in the optical-band gap values for the both ZnO thin films. Consequently, it is deduced that the ZnO thin films exhibit different distortions of the tetrahedral {[}ZnO4] clusters, corresponding to different concentrations of deep and shallow level defects in both samples. This difference induced a variation of the interface/bulk-surface, which might be responsible for the enhanced optical and gas sensor properties of the pressure-assisted thermally annealed film. Additionally, pressure-assisted thermal annealing of the ZnO films improved the H-2 sensitivity by a factor of two. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 09/11099-2 - PREPARATION AND CHARACTERIZATION OF CaCu3Ti4O12 THIN FILMS BY HIGH PRESSURE IM SILICON SUBSTRATE WITH DIFFERENT ELECTRODES
Grantee:Thiago Sequinel
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 98/14324-0 - Multidisciplinary Center for Development of Ceramic Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC