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Singh, Ajay
Preferred name
Singh, Ajay
Official Name
Singh, Ajay
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Now showing 1 - 4 of 4
- PublicationDirecting semiconductor nanorod assembly into 1D or 2D supercrystals by altering the surface chargeCoulomb repulsion due to the surface charge on semi-conductor nanorods works against the dipole–dipole attraction that tends to direct the nanorods to self-assemble; the nature of this self-assembly for CdSe nanorods can be thus altered by pyridine washing, which charges the rods surface—thereby allowing the Coulomb repulsion to tailor the alignment.
Scopus© Citations 49 663 - 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 - PublicationSize controlled gold tip growth onto II–VI nanorods(RSC publications, 2010-09-28)
; ; ; ; Gold tip size and multiplicity is controlled in hybrid gold-semiconductor nanorods (CdS-Au, CdSe-Au and CdTe-Au) in fast reaction times of less than 2 minutes by optimising precursor type, concentration, and temperature. Controllable gold tips up to as large as 40 nm on a rod diameter of 7 nm are reported with the tip size shown to be directly related to the redox potentials of the dangling atoms on the nanorod and the gold chloride precursors (mono or trivalent). The preference for symmetric (both ends) over asymmetric (single end) is achieved by simply elevating the reaction temperature to 80ºC without changing the reaction time. TEM and XRD analysis were preformed to verify both the gold nanoparticle size and crystallinity of the hybrid nanostructures. Increased quenching of nanorod emission is observed as the size of the gold tip increases suggesting optimisation of charge transfer between the semiconductor and the metal.Scopus© Citations 36 735 - 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