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Dense and optical transparent CdWO4 films by sol-gel processing for scintillation applications

Published online by Cambridge University Press:  31 January 2011

H.M. Shang ,
M. Bliss ,
S. Heald ,
T.K. Sham ,
F. Heigl  and
G.Z. Cao
H.M. Shang
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98105
M. Bliss
Affiliation:
Pacific Northwest National Laboratory, Richland, Washington 99352
S. Heald
Affiliation:
Pacific Northwest National Laboratory, Richland, Washington 99352
T.K. Sham
Affiliation:
Department of Chemistry, University of Western Ontario, Ontario, N6A 5B7, Canada
F. Heigl
Affiliation:
Department of Chemistry, University of Western Ontario, Ontario, N6A 5B7, Canada
G.Z. Cao*
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98105
*
a)Address all correspondence to this author. e-mail: gzcao@u.washington.edu
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Abstract

In this paper, we report the first successful fabrication of dense and optically transparent cadmium tungstate (CWO) films by sol-gel processing and the study of their optical and x-ray scintillation properties. A new sol-gel processing method was developed using tungstic acid and cadmium nitrate as precursors and hydrogen peroxide as solvent; homogeneous and stable CWO sols were aged at room temperature and used for the preparation of CWO films. A rapid sintering process was investigated and found to be necessary to make dense and optically transparent nanocrystalline CWO films. CWO films were uniform, fully dense, and crack-free, with CWO as the only detectable crystalline phase, as determined by x-ray diffraction. The thickness, density, grain size, and crystallinity of CWO films are all found to be strongly dependent on the sintering conditions and in turn impact the optical and x-ray scintillation properties. Sol-gel-derived dense CWO films demonstrated intense photoluminescence and x-ray excited optical luminescence intensity. The relationships between sol-gel processing, nanostructures, and optical and x-ray scintillation properties are discussed in detail.

Keywords

FilmLuminescenceSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1527 - 1536
Copyright
Copyright © Materials Research Society2007

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