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

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...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials research 2007-06, Vol.22 (6), p.1527-1536
Main Authors: Shang, H.M., Bliss, M., Heald, S., Sham, T.K., Heigl, F., Cao, G.Z.
Format: Article
Language:English
Subjects:
cadmium tungstate
CADMIUM TUNGSTATES
EXCITATION
fast sintering
GRAIN SIZE
LUMINESCENCE
MATERIALS SCIENCE
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
OPACITY
PHOTOLUMINESCENCE
scintillation film
SCINTILLATIONS
Sol-gel
SOL-GEL PROCESS
X-ray excitation optical luminescence
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2007.0215