Synthesis and Micrometer-Scale Assembly of Colloidal CdSe/CdS Nanorods Prepared by a Seeded Growth Approach

Key limitations of the colloidal semiconductor nanorods that have been reported so far are a significant distribution of lengths and diameters as well as the presence of irregular shapes produced by the current synthetic routes and, finally, the poor ability to fabricate large areas of oriented nano...

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Bibliographic Details
Published in:Nano letters 2007-10, Vol.7 (10), p.2942-2950
Main Authors: Carbone, Luigi, Nobile, Concetta, De Giorgi, Milena, Sala, Fabio Della, Morello, Giovanni, Pompa, Pierpaolo, Hytch, Martin, Snoeck, Etienne, Fiore, Angela, Franchini, Isabella R, Nadasan, Monica, Silvestre, Albert F, Chiodo, Letizia, Kudera, Stefan, Cingolani, Roberto, Krahne, Roman, Manna, Liberato
Format: Article
Language:English
Subjects:
Cadmium Compounds - chemistry
Chemical synthesis methods
Cross-disciplinary physics: materials science
rheology
Crystallization - methods
Exact sciences and technology
Macromolecular Substances - chemistry
Materials science
Materials Testing
Methods of nanofabrication
Molecular Conformation
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanotechnology - methods
Nanotubes - chemistry
Nanotubes - ultrastructure
Particle Size
Physics
Selenium Compounds - chemistry
Spectrometry, Fluorescence - methods
Sulfides - chemistry
Surface Properties
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Summary:Key limitations of the colloidal semiconductor nanorods that have been reported so far are a significant distribution of lengths and diameters as well as the presence of irregular shapes produced by the current synthetic routes and, finally, the poor ability to fabricate large areas of oriented nanorod arrays. Here, we report a seeded-growth approach to the synthesis of asymmetric core−shell CdSe/CdS nanorods with regular shapes and narrow distributions of rod diameters and lengths, the latter being easily tunable up to 150 nm. These rods are highly fluorescent and show linearly polarized emission, whereby the emission energy depends mainly on the core diameter. We demonstrate their lateral alignment as well as their vertical self-alignment on substrates up to areas of several square micrometers.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl0717661