Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 43, Issue 2, Pages 447-451Publisher
SPRINGER
DOI: 10.1007/s11664-013-2913-4
Keywords
Sol-gel; titania-zirconia matrices; rare earths; nanocrystallites; fluorescence enhancement
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Funding
- University Grant Commission (UGC, Govt. of India)
- Department of Science and Technology (DST, Govt. of India)
- Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE) Programs of the Department of Science and Technology (DST, Govt. of India)
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A sol-gel method was used to prepare titania-zirconia matrices doped with Sm3+/CdS nanocrystallites. The structural properties of the matrices were characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), and Fourier-transform infrared spectroscopy studies. The thermal stability of the material was determined by TGA/DTA analysis. The absorption spectrum shows the characteristic peaks of the Sm3+ ions and the absorption peak corresponding to the CdS nanocrystallites. The optical bandgap and size of the CdS nanoparticles were calculated from the absorption spectrum. From TEM, the interplanar distance (d) was estimated to be 3.533 , which matches with the (1 0 0) plane of bulk CdS. The measurements yield a nanocrystallite size of around 7.8 nm. The optical absorption and emission spectra confirmed the formation of CdS nanoparticles along with samarium ions in the titania-zirconia matrices. The fluorescence intensity of the samarium ions was found to be greatly enhanced by codoping with CdS nanocrystallites.
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