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Ryan, Kevin M.
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Ryan, Kevin M.
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Ryan, Kevin M.
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Now showing 1 - 4 of 4
- PublicationSpontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment(ACS Publications, 2009-08-06)
; ; ; ; ; ; ; 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.826Scopus© Citations 86 - PublicationElectrophoretic deposition of poly(3-decylthiophene) onto gold-mounted cadmium selenide nanorods(ACS Publications, 2011-09-21)
; ; ; ; ; Molecular mechanisms of electrophoretic deposition (EPD) of poly(3-decylthiophene) (P3DT) molecules onto vertically aligned cadmium selenide arrays have been studied using large-scale, nonequilibrium molecular dynamics (MD), in the absence and presence of static external electric fields. The field application and larger polymer charges accelerated EPD. Placement of multiple polymers at the same lateral displacement from the surface reduced average deposition times due to “crowding”, giving monolayer coverage. These findings were used to develop and validate Brownian dynamics simulations of multilayer polymer EPD in scaled-up systems with larger inter-rod spacings, presenting a generalized picture in qualitative agreement with random sequential adsorption.Scopus© Citations 6 666 - PublicationCentimetre scale assembly of vertically aligned and close packed semiconductor nanorods from solutionAssembly of CdS nanorods (8 × 100 nm) into vertically aligned arrays over very large areas on a substrate either as a monolayer or several multilayers is shown by electrophoresis.
Scopus© Citations 52 430 - PublicationA facile spin-cast route for cation exchange of multilayer perpendicularly-aligned nanorod assemblies(RSC publications, 2011-10-07)
; ; ; ; ; ; ; 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.Scopus© Citations 36 740