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Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment

2009-08-06, O'Sullivan, Catriona, Gunning, Robert Denis, Sanyal, Ambarish, Barrett, Christopher A., Geaney, Hugh, Laffir, Fathima R., Ahmed, Shafaat, Ryan, Kevin M.

Spontaneous elongation from nanorod to nanowire in the presence of an amine is reported for nanocrystals of cadmium sulfide and silver sulfide (cation exchanged from CdS). Elongation occurs instantaneously where the final aspect ratio is a controllable multiple of the original nanorod length. Transmission electron microscopy (TEM) analysis reveals the influential factors on the attachment processare the concentration of amine, duration and temperature of the reaction. The elongated nanorods are further characterized by X-ray diffraction (XRD), photoluminescence (PL), ultraviolet-visible spectroscopy(UV-vis) and X-ray photoelectron spectroscopy (XPS). A mechanism of oriented attachment is evidenced by the doubling in length of asymmetrically gold tipped CdS nanorods with the corresponding absence of elongation in symmetrically tipped nanorods.

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A facile spin-cast route for cation exchange of multilayer perpendicularly-aligned nanorod assemblies

2011-10-07, Kelly, Dervla, Singh, Ajay, Barrett, Christopher A., O'Sullivan, Catriona, Coughlan, Claudia, Laffir, Fathima R., O'Dwyer, Colm, Ryan, Kevin M.

A facile spin cast route was developed to convert perpendicularly aligned nanorod assemblies of cadmium chalcogenides into their silver and copper analogues. The assemblies are rapidly cation exchanged without affecting either the individual rod dimensions or collective superlattice order extending over several multilayers.