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Spectroscopic studies on quantum dots of $PbI_2$

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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Abstract

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
URI: http://eprints.iisc.ernet.in/id/eprint/12814

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