Graphical Bird on a quantum wire : Monodisperse Ag 2 S (or Ag 2 Se) ZnSe quantum wires can be synthesized at 120 °C with the assistance of Ag 2 S. These quantum wires are uniform in structure and morphology and have an aspect ratio of larger than 100. This method can be also used to fabricate CdSe quantum rods. A facile method for the low-cost and large-scale production of ultralong Ag 2 S (or Ag 2 Se) ZnSe quantum wires has been developed. ZnSe quantum wires (diameter≈4 nm) with high uniformity in their crystal structure and diameter can be synthesized by using a catalyst-assisted growth approach with Ag 2 S nanoparticles as a catalyst. The influence of the growth temperature, time, and type of catalytic particle on the morphology of the ZnSe quantum wires was systematically explored. Besides Ag 2 S, Ag 2 Se nanoparticles can also be adopted as the catalyst for the growth of ZnSe wires. This method can also be applied to the fabrication of uniform CdSe nanorods. This method is convenient for the controllable fabrication of metal selenides and is of importance for exploring fundamental nanoscale semiconductor physics, as well as for affording technological devices with optimized characteristics.
Self-assembly of inorganic nanocrystals into ordered superlattices is of particular importance for their application in biomedicine and solid-state optoelectronic devices. However, dimensionality-controlled self-assembly of nanocrystals is still in its infancy. Emulsion-droplet confined self-assembly could offer a solution considering that the liquid/liquid interface and inner compartments can be respectively used as 2D and 3D templates for the assembly of nanocrystals, producing assemblies with a controlled dimensionality. CdSe nanorods with different aspect ratios were synthesized, and were applied as building blocks to uncover their assembly modes within the o/w emulsion droplets. The results reveal that by using both hydrophilic and lipophilic surfactants, hydrophobic CdSe nanorods can be locked at the liquid/liquid interface to produce a 2D supracrystalline sheet. In contrast, hydrophilic surfactants alone can result in the formation of 3D supracrystalline spherical colloids in similar conditions. Lipophilic surfactants, such as octylamine, can interact with the alkyl chains coated on the CdSe nanorods strongly, which consequently modulates the assembly mode of nanorods within the emulsion droplets. By considering the soft coatings of these supracrystalline structures with two different dimensionalities, these materials could be ideal candidates for the study of their interactions with biological soft matter.
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