Journal ArticleDOI
Experimental and mathematical modeling studies of the separation of zinc blende and wurtzite phases of CdS nanorods by density gradient ultracentrifugation.
TLDR
It is shown that the density gradient ultracentrifugation rate separation method can be used to sort CdS NRs synthesized under nitrogen according to differences in particle size and morphology, and it was found that the different sized NRs formed in a single batch synthesis had different phases.Abstract:
Identifying the phase purity of CdS nanorods (NRs) is complicated by the serious overlap between the X-ray diffraction peaks of zinc blende and wurtzite phases as well as anisotropic growth, which might hide a mixed phase. Here we show that the density gradient ultracentrifugation rate separation method can be used to sort CdS NRs synthesized under nitrogen according to differences in particle size and morphology. Furthermore, it was found that the different sized NRs formed in a single batch synthesis had different phases: the thinner ones ( 5 nm in diameter) were mainly zinc blende phase. Dark-field transmission electron microscopy (TEM) and high-resolution TEM images indicated the presence of numerous stacking faults in the thick zinc blende rods, while the wurtzite thin rods were exclusively single crystals. As a result of the differences in phase and stacking faults, the NRs showed different photoluminescent properties. T...read more
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Journal ArticleDOI
Emerging strategies for the total synthesis of inorganic nanostructures.
Matthew Buck,Raymond E. Schaak +1 more
TL;DR: This Review highlights key strategies for the chemical transformation and stepwise synthesis of multicomponent inorganic nanostructures, with the existing nanoscale transformations categorized into classes of reactions that are related to those used in the synthesis of organic molecules.
Journal ArticleDOI
Preparation of monodisperse silicon nanocrystals using density gradient ultracentrifugation.
Melanie L. Mastronardi,Frank Hennrich,Eric J. Henderson,Florian Maier-Flaig,Carolin Blum,Judith Reichenbach,Uli Lemmer,Christian Kübel,Di Wang,Manfred M. Kappes,Geoffrey A. Ozin +10 more
TL;DR: The ability to isolate monodisperse ncSi will allow for the quantification of the size-dependent structural, optical, electrical, and biological properties of silicon, which will undoubtedly prove useful for tailoring property-specific optoelectronic and biomedical devices.
Journal ArticleDOI
Assembly and Electronic Applications of Colloidal Nanomaterials.
Jian Zhu,Mark C. Hersam +1 more
TL;DR: Using a ubiquitous electronic device - the field-effect transistor - as a platform, colloidal nanomaterials in three electronic material categories are reviewed systematically: semiconductors, conductors, and dielectrics and a comparative analysis reveals promising opportunities and remaining challenges, thereby providing a roadmap for future research and development.
Journal ArticleDOI
Solution-processed colloidal quantum dot photovoltaics: A perspective
TL;DR: A review of the latest advances in the field and discuss the avenues for further progress towards commercially compelling performance can be found in this paper, where the authors highlight the major progress and achievements in CQD photovoltaics, focusing on the introduction of improved device architectures.
Journal ArticleDOI
Solution‐processable exfoliated zeolite nanosheets purified by density gradient centrifugation
Kumar Varoon Agrawal,Berna Topuz,Zheyu Jiang,Kevin Nguenkam,Bahman Elyassi,Lorraine F. Francis,Michael Tsapatsis,Marta Navarro +7 more
TL;DR: In this paper, the removal of polystyrene from the nanosheet suspension in toluene is demonstrated by centrifugation of the suspension across chlorobenzene as confirmed by thermogravimetric analysis (TGA) data and transmission electron microscopy images.
References
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Journal ArticleDOI
Semiconductor Nanocrystals as Fluorescent Biological Labels
TL;DR: Semiconductor nanocrystals prepared for use as fluorescent probes in biological staining and diagnostics have a narrow, tunable, symmetric emission spectrum and are photochemically stable.
Journal ArticleDOI
Quantum Dot Bioconjugates for Ultrasensitive Nonisotopic Detection
Warren C. W. Chan,Shuming Nie +1 more
TL;DR: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection and these nanometer-sized conjugates are water-soluble and biocompatible.
Journal ArticleDOI
Hybrid Nanorod-Polymer Solar Cells
TL;DR: It is demonstrated that semiconductor nanorods can be used to fabricate readily processed and efficient hybrid solar cells together with polymers and Tuning the band gap by altering the nanorod radius enabled us to optimize the overlap between the absorption spectrum of the cell and the solar emission spectrum.
Journal ArticleDOI
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal Article
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.