Journal
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Volume 128, Issue 1-3, Pages 254-259Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.mseb.2005.11.040
Keywords
nanofilms; CaWO4; BaWO4; SrWO4; collodion
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AWO(4) (A = Ca, Ba, Sr) nanofilms on a glass substrate are prepared through the combination of the reverse micelle system with the dip-coating technology, in which collodion is used as a dispersant and film-forming agent. The nanofilms are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL) and IR spectra, respectively. The results indicate that the tungstate nanoparticles having a tetragonal scheelite structure are well distributed on the substrate. PL results indicate that a blue-shift emission band peak of the nanofilms appears when they are excited at 240 nm relative to those of the bulk materials, and a red-shift emission band peak of nanofilms appears compared with nanoparticles, which can be attributed to the quantum size effect. IR spectra reveal that a large absorption band, which is ascribed to the W-O stretching vibration ill WO4 tetrahedron, is observed around 820 cm(-1). (c) 2005 Elsevier B.V. All rights reserved.
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