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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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References

REFERENCES

1Blasse, G.Grabmaier, B.C.: Luminescent Materials Springer-Verlag Heidelberg, Germany 1994CrossRefGoogle Scholar
2Sabharwal, S.C., Sangeeta, : Study of growth imperfections, optical absorption, thermoluminescence and radiation hardness of CdWO4crystals. J. Cryst. Growth 200(1–2), 191 1999CrossRefGoogle Scholar
3Nagornaya, L., Onyshchenko, G., Pirogov, E., Starzhinskiy, N., Tupitsyna, I., Ryzhikov, V., Galich, Yu., Vostretsov, Yu., Galkin, S.Voronkin, E.: Production of the high-quality CdWO4single crystals for application in CT and radiometric monitoring. Nucl. Instrum. Methods Phys. Res., Sect. A 537, 163 2004CrossRefGoogle Scholar
4Martin, T.Koch, A.: Recent developments in x-ray imaging with micrometer spatial resolution. J. Synchrotron Radiat. 13, 180 2006CrossRefGoogle ScholarPubMed
5Ryzhikov, V., Nagornaya, L., Volkov, V., Chernikov, V.Zelenskaya, O.: Thermal neutron detectors based on complex oxide crystals. Nucl. Instrum. Methods Phys. Res., Sect. A 486, 156 2002CrossRefGoogle Scholar
6Nagornaya, L., Burachas, S., Vostretsov, Yu., Martynov, V.Ryzhikov, V.: Studies of ways to reduce defects in CdWO4single crystals. J. Cryst. Growth 198–199, 877 1999CrossRefGoogle Scholar
7Lennstrom, K., Limmer, S.J.Cao, G.Z.: Synthesis of cadmium tungstate films via sol-gel processing. Thin Solid Films 434, 55 2003CrossRefGoogle Scholar
8Tanaka, K., Shirai, N., Sugiyama, I.Nakata, R.: Pulsed laser deposition of CdWO4. Nucl. Instrum. Methods Phys. Res., Sect. B 121, 404 1997CrossRefGoogle Scholar
9Lou, Z.D., Hao, J.H.Cocivera, M.: Luminescence of ZnWO4and CdWO4thin films prepared by spray pyrolysis. J. Lumin. 99, 349 2002CrossRefGoogle Scholar
10Shang, H.M., Wang, Y., Bliss, M.Cao, G.Z.: Hydrothermal growth and photoluminescence property of textured CdWO4scintillator films. Appl. Phys. Lett. 87, 051909-1 2005CrossRefGoogle Scholar
11Yu, S.H., Antonietti, M., Cölfen, H.Giersig, M.: Synthesis of very thin 1D and 2D CdWO4nanoparticles with improved fluorescence behavior by polymer-controlled crystallization. Angew. Chem. Int. Ed. Engl. 41, 2356 20023.0.CO;2-U>CrossRefGoogle ScholarPubMed
12Xiong, Y.J., Xie, Y., Li, Z.Q., Li, X.X.Gao, S.M.: Aqueous-solution growth of GaP and InP nanowires: A general route to phosphide, oxide, sulfide, and tungstate nanowires. Chem. Eur. J. 10, 654 2004CrossRefGoogle ScholarPubMed
13Rahaman, M.N.: Ceramic Processing and Sintering Marcel Dekker New York 1995Google Scholar
14Shang, H.M., Wang, Y., Milbrath, B., Bliss, M.Cao, G.Z.: Effects of dopants in cadmium tungstate scintillator films, in Nanophotonic Materials, edited by D.L. Andrews, G.Z. Cao, and Z. Gaburro (Proc. SPIE, Billingham, WA, 5510, 2004), 8896CrossRefGoogle Scholar
15Cantalini, C., Atashbar, M.Z.Li, Y.: Characterization of sol-gel prepared WO3thin films as a gas sensor. J. Vac. Sci. Technol., A 17, 1873 1999CrossRefGoogle Scholar
16Badilescu, S., Nguyen, M.H., Bader, G., Ashrit, P.V., Girouard, F.E.Truong, V.V.: Structure and infrared spectra of sol-gel derived tungsten oxide thin films. J. Mol. Struct. 297, 393 1993CrossRefGoogle Scholar
17Shang, H.M., Wang, Y., Bliss, M.Cao, G.Z.: Processing and optical properties of sol-gel derived nanostructured CdWO4films (Proceedings of SPIE, Billingham, WA, 6008, 2005), pp. 60081B-160081B-8CrossRefGoogle Scholar
18Shang, H.M., Wang, Y., Milbrath, B., Bliss, M.Cao, G.Z.: Doping effects in nanostructured cadmium tungstate scintillation films. J. Lumin. 121, 527 2006CrossRefGoogle Scholar
19Klejnot, O.J.: Chloride alkoxides of pentavalent tungsten. Inorg. Chem. 4, 1668 1965CrossRefGoogle Scholar
20Pecquenard, B., Garcia, S.C., Livage, J., Zavalij, P.Y., Whittingham, M.S.Thouvenot, R.: Structure of hydrated tungsten peroxides [WO2(O2)H2O]·nH2O. Chem. Mater. 10, 1882 1998CrossRefGoogle Scholar
21Judeinstein, P.Livage, J.: Sol-gel synthesis of WO3thin films. J. Mater. Chem. 1, 621 1991CrossRefGoogle Scholar
22Chan, C.M., Cao, G.Z., Fong, H., Sarikaya, M., Robinson, T.Nelson, L.: Nanoindentation and adhesion of sol-gel derived coatings on polyester. J. Mater. Res. 15, 148 2000CrossRefGoogle Scholar
23Brinker, C.J.Scherer, G.W.: Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing Academic Press New York 1990Google Scholar
24Robertson, D.S., Young, I.M.Telfer, J.R.: The cadmium oxide-tungsten oxide phase system and growth of cadmium tungstate single crystals. J. Mater. Sci. 14, 2967 1979CrossRefGoogle Scholar
25Hsu, Y.C., Wu, C.C., Lee, C.C., Cao, G.Z.Shen, I.Y.: Demonstration and characterization of PZT thin film sensors and actuators for meso- and microstructures. Sens. Actuators A 116, 369 2004CrossRefGoogle Scholar
26Cullity, B.D.Stock, S.R.: Elements of X-ray Diffraction,3rd ed. (Prentice-Hall, NJ, 2001)Google Scholar
27Hu, Y.F., Tan, K.H., Kim, P.S., Zhang, P., Nafte, S.J., Sham, T.K., Coulthard, I.Yates, B.W.: Soft x-ray excited optical luminescence: Some recent applications. Rev. Sci. Instrum. 73, 1379 2002CrossRefGoogle Scholar
28Heigl, F., Lam, S., Regier, T., Coulthard, I.Sham, T.K.: Time-resolved x-ray excited optical luminescence from tris(2-phenylbipyridine)iridium. J. Am. Chem. Soc. 128, 3906 2006CrossRefGoogle ScholarPubMed
29Grasser, R., Scharmann, A.Strack, K-R.: On the intrinsic nature of the blue luminescence in CaWO4. J. Lumin. 27, 263 1982CrossRefGoogle Scholar