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17 November 2005 Processing and optical properties of sol-gel derived nanostructured CdWO4 films
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Proceedings Volume 6008, Nanosensing: Materials and Devices II; 60081B (2005)
Event: Optics East 2005, 2005, Boston, MA, United States
Dense and transparent cadmium tungstate (CWO) scintillation films have been first synthesized by sol-gel processing and their optical properties have been studied. Different precursors (tungsten oxychloride and tungstic acid), solvents (alcohol based and aqueous based) and thermal annealing processing conditions were investigated to achieve stable sols and resultant dense nanocrystalline CWO films. XRD showed CWO was the only detectable crystalline phase in the film derived by tungstic acid based sol and fast sintering at 500°C for 20 min, while the slow sintered films derived both from tungstic acid and tungsten oxychloride at 500°C for 1 hour with a heating ramp of 8°C/min resulted in porous films containing some extra tungsten oxide phases besides CWO. The fast sintered CWO film was uniform, fully dense, crack-free and of 0.5 μm in thickness. Optical transparency and photoluminescence of CWO films were characterized, and the results showed that high density and low porosity of CWO film by fast sintering led to higher transmittance and photoluminescence output. By controlling synthesis and sintering methods the nanocrystalline grains in CWO films can be of 15~52 nm in diameter. The relationships between sol-gel processing, precursor and solvent chemistry, nanostructures, densification and optical properties were discussed.
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H. M. Shang, Y. Wang, M. Bliss, and G. Z. Cao "Processing and optical properties of sol-gel derived nanostructured CdWO4 films", Proc. SPIE 6008, Nanosensing: Materials and Devices II, 60081B (17 November 2005);

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