Roy, A. and Sarma, D. D. and Sood, A. K. (1992) Spectroscopic studies on quantum dots of PbI2. Spectrochimica Acta Part A: Molecular Spectroscopy, 48 (11-12). 1779-1787 .
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We report the preparation of PbI2 clusters of sizes less than 30 Å by colloidal routes and characterization by optical absorption spectra. We show that the blue-shifted absorption spectra are not due to the presence of I−3 ions, as suggested previously, but are characteristic of the clusters present. We also show that similar sized clusters form, though sparingly, on dissolving bulk PbI2 in the solvents. We establish that the stability of a large concentration of these clusters in the colloidal process is due to the presence of excess iodine ions attached to the microcrystallites.
|Subjects:||Physical Science > Quantum phenomena|
Material Science > Nanochemistry
Physical Science > Photonics
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||03 Apr 2009 06:35|
|Last Modified:||03 Apr 2009 06:35|
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