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Hidden role of anion exchange reactions in nucleation of colloidal nanocrystals

Mahadevu, Rekha and Kaur, Harveen and Pandey, Anshu (2016) Hidden role of anion exchange reactions in nucleation of colloidal nanocrystals. In: CRYSTENGCOMM, 18 (5). pp. 759-764.

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Official URL: http://dx.doi.org/10.1039/c5ce02114f


We investigate the processes involved in the nucleation of colloidal lead selenide nanoparticles. Our studies show that an unusual pathway - an anion exchange reaction, causes the nucleation of lead selenide nanocrystals. In this process, one quantum dot is transformed into another due to a substitution of its constituent anions. The existence of this pathway was never anticipated perhaps due to its unusually rapid kinetics. The nucleation and growth kinetics of colloidal lead selenide quantum dots are found to fit well to a two-step process. The rate constant associated with the anion exchange process is found to be four orders of magnitude greater than that of the nanocrystal growth. The complete consumption of the initial oxide nanoparticle thus provides a sharp, temporally well-defined nucleation event.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 04 Mar 2016 07:45
Last Modified: 04 Mar 2016 07:45
URI: http://eprints.iisc.ac.in/id/eprint/53321

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