Abstract
In recent years, numerous protocols for nanoplatelet synthesis have been developed. Here, we present a facile, one-pot method for controlling cadmium sulfide (CdS) nanoparticles’ shape that allows for obtaining zero-dimensional, one-dimensional, or two-dimensional structures. The proposed synthesis protocol is a simple heating-up approach and does not involve any inconvenient steps such as injection and/or pouring the precursors at elevated temperatures. Because of this, the synthesis protocol is highly repeatable. A gradual increase in the zinc acetate concentration causes the particles’ shape to undergo a transition from isotropic quantum dots through rods to highly anisotropic nanoplatelets. We identified conditions at which synthesized platelets were purely five monolayers thick. All samples acquired during different stages of the reaction were characterized via optical spectroscopy, which allowed for the identification of the presence of high-temperature, magic-size clusters prior to the platelets’ formation.
Highlights
We studied the growth of cadmium sulfide (CdS) NPLs in one-pot synIn this work, we studied the growth cadmium sulfide (CdS)
Adding a small amount of Zn(Ac)2 concentration (Zn)(Ac)2 resulted in the incorporation of zinc ions into the CdS nanocrystal forming a CdS core/CdZnS thin alloy shell structure
We describe a similar synthesis procedure as in the abovementioned work, namely, a heating-up one-pot reaction of the mixture composed of ODE, Cd(OL)2, sulfur, and Zn(Ac
Summary
Crystal energy always tends to a minimum in given conditions; the shape is determined by the surface free energy of each facet These energies can be manipulated, e.g., by adding specific ligands to the synthesis solution. [20]clusters stated that mointermediate plateletof growth magic size clusterset(MSCs), comprising lecular templates are not indispensable for achieving a They have shown that a strictly defined number of atoms, whereas Riedinger et al [20] stated that molecular in the case of are zincnot blende platelets, the parameter is theThey cadmium solutemplates indispensable for critical achieving a 2D shape. Critical steps determineinthe form during the reaction or high-temperature injection These critical steps determine subsequent course of the reaction, and a small mistake or change in parameters can result the subsequent course of the reaction, and aand, small mistake or change in losing control over the nanoparticles’. Reagent in the initial synthesis solution causes the transition from 0D to 1D and further to 2D nanocrystals
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