Journal
PHYSICA B-CONDENSED MATTER
Volume 404, Issue 8-11, Pages 1204-1208Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2008.11.098
Keywords
Kinetics; Nanomaterials; Nucleation; CdSe; Extinction coefficient; HDA capped
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Funding
- CSIR and National Research Foundation (NRF), South Africa
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The growth kinetics of hexadecylamine (HDA) capped CdSe synthesised via a novel, mild, effective, and facile non-organometallic route was studied using its electronic properties. The emission and optical maxima of all the nanoparticles synthesised are blue-shifted as the reaction time increases indicating decrease in particle size. The UV spectra show distinct excitonic features which can be attributed to the first electronic transition [1S(3/2)(h)-1S(e)] occurring in CdSe nanoparticles with band-edge luminescence in their emission spectra. The extinction coefficient was determined for convenient and accurate measurements of the concentration of the nanocrystals. Nucleation is very fast and well separated from particle growth under this reaction condition. Two distinguishable stages of growth were observed: an early stage 0-10 min characterised by fast growth, with narrow size distribution and the late stage characterised by slow growth with slight defocusing of size distribution and large particle sizes. The diameter of the size ranges from 2.2 to 3.0 nm. About 94% of the available monomer concentration was consumed during the growth and the solubility of 3.0 nm CdSe in hexadecylamine is measured to be 9.216 x 10(-7) M-2 at 433 K. (C) 2008 Elsevier B.V. All rights reserved.
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