CdSe quantum rods

Two different nanomaterials, namely colloidal core / shell Quantum Dots (QDs) and Quantum Rods (QRs) were synthesized as described in [51]. In the case of CdSe / ZnS QDs, the synthesis yielded samples emitting at Inux = 580 nm widi a spectral width of the fluorescence emission of 40 nm. CdSe quantum rods showed an emission peak centered at l x = 567 nm with similar linewidth. The NCs were subsequently dispersed in PMMA and deposited onto the substrate by spin-coating. In order to study tiie influence of the average fluorophore-metallic surface distance on the MEF efi t, several thicknesses of the active layer were investigated, finding an o(Aimum value of 35 nm, as measured from the surface of the metallic nanostructures. 

Peng et al. recently reported the use of the hot-soup method to produce CdSe quantum rods (222). Changes in several experimental parameters were found to affect properties of the quantum rods such as size and aspect ratio. These parameters included ligand selection, reaction time, injection and growth temperatures, and number of injections. Controlled variations in these parameters could also be employed to change the product morphology from rod-like to nearly spherical. 

D. Katz, T. Wizansky, O. Millo, E. Rothenberg, T. Mokari, U. Banin, Size-dependent tunneling and optical spectroscopy of CdSe quantum rods. Phys. Rev. Lett. 89(8), 086801 (2002)... 

Chemists have synthesized a spectacular array of submicron- and nano-particles with well-defined size and atomic structure and very special properties. Examples include CdSe quantum dots and novel spheres and rods. Transport enters the picture via fundamental studies of the physical processes that affect the synthesis, which must be understood for even modest scale-up from the milligram level. Likewise, processes for assembling fascinating face-centered-cubic crystals or ordered multilayers must concentrate on organizing the particles via flow, diffusion, or action of external fields. Near-perfection is possible but requires careful understanding and control of the forces and the rates. 

Khoo, I. C., Kan Chen, andY. Zhang Williams. 2006. Orientatioiral photorefiactive effect in undoped and CdSe nano-rods doped nematic liquid crystal Bulk and interface contri-butioirs. lEEEJ. Sel. Top. Quantum Electron. 12(3) 443 50. 

Khoo, 1. C., Kan Chen, and Y. Wilhams. 2006. Orientational photorefractive effect in undoped and CdSe nano-rods doped nematic liquid crystal Bulk and interface contributions. J. Sel. Top. Quantum Electron 12(3) 443 50 see also Khoo, I. C., Yana Zhang Wilhams, B. Lewis, and T. Mallouk. 2005. Photorefractive CdSe and gold nanowire-doped hquid crystals and polymer-dispersed-liquid-crystal photonic crystals. Mol. Cryst Liq. Cryst. 446 233-244. 

Solution-phase preparations of unusually shaped and highly anisotropic particles that are soluble, relatively monodisperse, and sufficiently small to exhibit quantum-confinement effects are thus far limited, but not exclusive to CdSe. CdS and CdTe rods can be prepared using phosphonic-acid-controlled reactions. In addition, CdS rods and multipods can be prepared in a monosurfactant system in which hexadecylamine (HDA) serves both as the stabilizing ligand and as the shapedetermining ligand.Here, rod and multipod formation... 

---