Study of morphological and luminescent properties (TL and OSL) of ZnO nanocrystals synthetized by coprecipitation method

Autor(es)

Soares, A. F. ; Tatumi, S. H. ; Mazzo, T. M. ; Rocca, R. R. ; Courrol, L. C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 186, p. 135-143, JUN 2017.
• Citações Web of Science: 9

Resumo

In this work, ZnO nanocrystalline phosphorus were synthesized using the method of coprecipitation, subsequently different heat treatments at 900 and 1000 degrees C for 2 h and 1000 degrees C for 4 h were performed. Afterward, Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) emissions were verified after exposure to beta-radiation. Photoluminescence results showed UV and VIS emissions. Morphological studies with X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) confirmed the crystallinity of the samples, with their well-shaped wurtzite hexagonal structures in nanoscale. ZnO calcinated at 900 degrees C - 2 h emitted a broad TL peak located between the 362-372 degrees C; for ZnO calcinated at 1000 degrees C - 2 h, two intense peaks were observed at 144 and 308 degrees C, this TL emission curve was investigated with more details using Computerized Glow Curve Deconvolution and six individual TL peaks were obtained, for sample irradiated with 40.6 Gy, corroborating with the T-m-T-stop results. A study of Minimum Detectable Dose (MDD) was made and a dose of (492 +/- 40) mu Gy was determined. CW-OSL and LM-OSL analysis were made for ZnO calcinated at 1000 degrees C - 2 h, allowed to verify the behaviour, and the curve existing components (fast and medium, depending on dose). As well as the calculation of the Minimum Detectable Dose for CW-OSL. (c) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/02069-2 - Implantação e desenvolvimento da metodologia de datação de grão-único, por luminescência opticamente estimulada
• Beneficiário: Sonia Hatsue Tatumi
• Modalidade de apoio: Auxílio à Pesquisa - Regular