Shape control of CdSe nanocrystals

  title={Shape control of CdSe nanocrystals},
  author={Xiaogang Peng and Liberato Manna and Weidong Yang and Juanita Wickham and Erik C. Scher and Andreas V. Kadavanich and A. Paul Alivisatos},
Nanometre-size inorganic dots, tubes and wires exhibit a wide range of electrical and optical properties that depend sensitively on both size and shape, and are of both fundamental and technological interest. In contrast to the syntheses of zero-dimensional systems, existing preparations of one-dimensional systems often yield networks of tubes or rods which are difficult to separate. And, in the case of optically active II–VI and III–V semiconductors, the resulting rod diameters are too large… 
Synthesis and size-dependent properties of zinc-blende semiconductor quantum rods
This work reports on a general method for the growth of soluble nanorods applied to semiconductors with the zinc-blende cubic lattice structure, and provides an unexpected link between two successful strategies for growing high-quality nanomaterials, the vapour–liquid–solid approach for growing nanowires and the colloidal approach for synthesizing soluble nanocrystals.
Shape control of III-V semiconductor nanocrystals: synthesis and properties of InAs quantum rods.
Within the three types of metal catalysts used--Au, Ag and In, Au was found to provide the best control for achieving rod-growth even though the melting point of bulk gold is significantly higher then the reaction temperature.
Synthesis and Characterization of III-V Rod Shape Semiconductor Nanocrystals
InP and InAs quantum rods were synthesized via the reactions of monodispersed indium droplets with phosphide or arsenide ions, respectively. In these reactions indium droplets, which do not act as a
Lab-in-a-drop: controlled self-assembly of CdSe/ZnS quantum dots and quantum rods into polycrystalline nanostructures with desired optical properties
Among the different nanometre-scale building blocks, colloidal nanocrystals are of special interest in construction of ordered assemblies to be used in optoelectronics, photonics and biosensing. It
Semiconductor nanocrystal-polymer composites: using polymers for nanocrystal processing
Semiconductor nanocrystals (NCs) in the size range of 1–10 nm exhibit unique size-dependent photoluminescence properties, distinct from either the corresponding molecules or bulk materials, which are
Molecular valves for colloidal growth of nanocrystal quantum dots: effect of precursor decomposition and intermediate species
The ability to manipulate matter on the nanometer length scale is an important scientific goal, and the progress in the field of colloidal nanocrystal (NC) growth in the past decades has opened
Strain-dependent photoluminescence behavior in three geometries of CdSe/CdS nanocrystals
In recent years, a new generation of quantum confined colloidal semiconductor structures has emerged, with more complex shapes than simple quantum dots1, 2. These include nanorods3 and tetrapods4.
Advances in the Colloidal Synthesis of Two-Dimensional Semiconductor Nanoribbons
The shape-controlled synthesis of colloidal semiconductor nanocrystals has attracted a lot of interest because of their shape-dependent physical and chemical properties. With the growing
Dimension-controlled synthesis of CdS nanocrystals: from 0D quantum dots to 2D nanoplates.
The 2D CdS nanoplates are a new type of quantum well with novel nanoscale properties in the strong quantum confinement regime and increase in a stepwise manner while retaining their uniformity, similar to the growth behavior of inorganic clusters.
From CdSe Nanoplatelets to Quantum Rings by Thermochemical Edge Reconfiguration
This work reports how two-dimensional CdSe nanoplatelets reshaping into quantum rings is monitored in real time by combining atomically resolved structural characterization with optical absorption and photoluminescence spectroscopy.


Controlled growth and electrical properties of heterojunctions of carbon nanotubes and silicon nanowires
Nanometre-scale electronic structures are of both fundamental and technological interest: they provide a link between molecular and solid state physics, and have the potential to reach far higher
Epitaxial Growth of Highly Luminescent CdSe/CdS Core/Shell Nanocrystals with Photostability and Electronic Accessibility
The synthesis of epitaxially grown, wurtzite CdSe/CdS core/shell nanocrystals is reported. Shells of up to three monolayers in thickness were grown on cores ranging in diameter from 23 to 39 A. Shell
Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
A simple route to the production of high-quality CdE (E=S, Se, Te) semiconductor nanocrystallites is presented. Crystallites from ∼12 A to ∼115 A in diameter with consistent crystal structure,
Electrochemical Fabrication of CdS Nanowire Arrays in Porous Anodic Aluminum Oxide Templates
A technique is described for fabricating arrays of uniform CdS nanowires with lengths up to 1 μm and diameters as small as 9 nm by electrochemically depositing the semiconductor directly into the
(CdSe)ZnS Core-Shell Quantum Dots - Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites
We report a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A. The narrow photoluminescence (fwhm ≤ 40 nm) from these composite dots
Improved efficiencies in light emitting diodes made with CdSe(CdS) core/shell type nanocrystals and a semiconducting polymer
We report experiments on bilayer light emitting diodes made with organically capped CdSe(CdS) core/shell type semiconductor nanocrystals and an electroluminescent (EL) semiconducting polymer
Electroluminescence from heterostructures of poly(phenylene vinylene) and inorganic CdSe nanocrystals
Electroluminescence (EL) and photoluminescence (PL) from heterostructure thin films made of organic poly (phenylene vinylene), PPV, and inorganic semiconductor CdSe nanocrystals are investigated. In
Electronic-Structure Theory of Semiconductor Quantum Dots
Progress made in the growth of “free-standing” (e.g., colloidal) quantum dots (see also articles in this issue by Nozik and Micic, and by Alivisatos) and in the growth of semiconductor-embedded
Shape-Controlled Synthesis of Colloidal Platinum Nanoparticles
Tetrahedral, cubic, irregular-prismatic, icosahedral, and cubo-octahedral particle shapes were observed, whose distribution was dependent on the concentration ratio of the capping polymer material to the platinum cation.