Roy, A and Sarma, DD and Sood, AK (1992) Spectroscopic studies on quantum dots of $PbI_2$. In: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 48 (11-12). pp. 1779-1787.
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We report the preparation of $PbI_2$ clusters of sizes less than 30 \AA 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 $PbI_2$ 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.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science B.V.|
|Keywords:||Spectroscopic studies;quantum dots;lead iodide;optical absorption spectra|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
|Date Deposited:||28 Dec 2007|
|Last Modified:||19 Sep 2010 04:42|
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