Interparticle influence on size and size distribution evolution of nanocrystals |
Posted on:2009-01-03 | Degree:Ph.D | Type:Dissertation |
University:University of Arkansas | Candidate:Thessing, Jason Daniel | Full Text:PDF |
GTID:1441390005458114 | Subject:Chemistry |
Abstract/Summary: | |
The work performed for this dissertation introduces a Monte Carlo simulation method to quantitatively deconvolute the size-dependent UV-vis absorption spectra of colloidal semiconductor nanocrystals. The method was experimentally verified and then applied for studying the transition stage from net dissolution to Ostwald ripening of CdS nanocrystals in a few nanometers size range quantitatively using the UV-vis spectra recorded in situ. Interparticle interaction in such processes was identified, which strongly affected the temporal evolution of the size and size distribution in a system. A preliminary model was proposed to quantitatively account for these observations by considering both solution-particle and particle-particle diffusion. The results indicate that crystallization processes of nanocrystals are substantially different from that of large-sized crystals. |
Keywords/Search Tags: | Nanocrystals, Size and size distribution |
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