Microwave Synthesis of CdSe and CdTe Nanocrystals in Nonabsorbing Alkanes

Washington, A. L.; Strouse, Geoffrey F.

doi:10.1021/ja711115r

Cited by 138 publications

(123 citation statements)

References 66 publications

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“…Therefore, using this method, QDs can be grown rapidly (no longer requiring elongated synthesis over several hours or even days) and controlled by a combination of reactant concentration and MW power, while QD size can be templated by the reaction temperature. 126 The MW approach allows the preparation of very interesting anisotropic 3D quantum nanostructures and avoids the high-temperature injection procedure. For example, Zn x Cd 1−x S nanoflowers have been produced by MWassisted chemical bath deposition from cadmium chloride, zinc chloride, and thiourea precursors.…”

Section: Preparation Of Anisotropic Nanostructures By Coprecipitationmentioning

confidence: 99%

Anisotropic3DColloidal Quantum Nanostructures

Govan¹,

Spiridonov

Fëdorov

et al. 2016

Encyclopedia of Inorganic and Bioinorganic Chemistry

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3D anisotropic semiconductor nanostructures have unique physical properties including a high aspect ratio, optical polarization anisotropy, polarized photoluminescence, giant birefringence, and many others. Theoretical studies of anisotropic semiconductor nanostructures have shown that their electronic and optical properties dramatically depend on their shape and size. These factors open up an access to new generation of optical, optoelectronic, and light‐harvesting devices. In this article, we demonstrate advances in the development of new 3D quantum‐confined colloidal nanostructures such as semiconductor nanotetrapods, nanomultipods, nanoflowers, nanostar and other shapes. We present the latest progress in various colloidal chemistry approaches for the synthesis of these nanostructures. We also consider the self‐organization of quantum dots in 3D superparticles. We discuss structure–property relations as well as the corresponding potential applications of these nanomaterials in light‐harvesting, energy‐conversion devices, sensing, photocatalysis, biology, and other areas. Finally, we provide conclusions and an outlook for the future development of anisotropic semiconductor nanomaterials and their technological prospects.

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Section: Preparation Of Anisotropic Nanostructures By Coprecipitationmentioning

confidence: 99%

Anisotropic3DColloidal Quantum Nanostructures

Govan¹,

Spiridonov

Fëdorov

et al. 2016

Encyclopedia of Inorganic and Bioinorganic Chemistry

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“…[16][17][18][19][20][21][22] The specific microwave dielectric heating provides several advantages over other processing approaches. It is easy to operate, efficient in terms of energy and therefore is considered more environment-friendly.…”

Section: 11mentioning

confidence: 99%

Microwaves as a synthetic route for preparing electrochemically active TiO₂ nanoparticles

et al. 2012

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Nanocrystalline anatase was synthesized, using both domestic and laboratory microwave ovens, from different precursors. Nanoparticulate anatase was obtained after microwave irradiation of tetra-butyl orthotitanate solution in benzyl alcohol. As-synthesized samples have orange color due to the presence of organics that were eliminated after annealing at 500°C, whereas the size of small anatase nanocrystals (around 8 nm) was preserved. Other nanocrystalline anatase samples were obtained from hexafluorotitanate-organic salt ionic liquid-like precursors. In this case, use of a domestic microwave oven and very short processing times (1-3 min irradiation time) were involved. Good specific capacity values and capacity retention at high C rates for insertion/deinsertion of Li 1 were recorded when testing such nanoparticles as electrode material in lithium cells. The electrochemical performances were found be strongly dependent on the phase composition, which in turn could be tuned through the synthetic procedure.

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“…Washington and Strouse used the ''specific MW effect'' to control nanomaterial growth of CdSe and CdTe nanocrystals in nonabsorbing alkanes by selective heating of the chalcogenide precursor [75].…”

Section: Heterogeneous Reactions Diffusionmentioning

confidence: 99%

Elucidation of Microwave Effects: Methods, Theories, and Predictive Models

Hoz

Díaz‐Ortiz

Gómez

et al. 2012

Microwaves in Organic Synthesis

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IntroductionThe impact of microwave (MW) irradiation in organic synthesis has increased over the years and especially since the development of new dedicated and reliable MW instruments [1].MW-assisted organic synthesis has been characterized by the spectacular accelerations produced in many reactions as a consequence of a heating rate which, in most cases, cannot be reproduced by classical heating. This effect is particularly important in (i) the preparation of isotopically labeled drugs for positron emission tomography (PET) that have a short half-life ( 11 C, t1 / 2 = 20 min; 122 I, t1 / 2 = 3.6 min; 18 F, t1 / 2 = 100 min) [2], (ii) high-throughput chemistry (combinatorial and parallel chemistry) where a rapid synthesis may increase the efficiency [3], (iii) catalysis where the short reaction time protects the catalyst from decomposition and increases the catalyst efficiency [4], and (iv) the synthesis of unstable or sensitive compounds, for example, natural products, where the short reaction time prevent the decomposition that occurs with long reaction times [5].The occurrence of results that cannot be explained exclusively by rapid heating led several authors to postulate the existence of a so-called ''microwave effect.'' Hence acceleration or modifications of the selectivity and reactivity could be explained by an effect of the electromagnetic radiation and not merely by the heating effect. In this way, in combination with the rapid heating, specific thermal effects and non-thermal effect could be the responsible for the improvement of many chemical processes.The occurrence of MW effects has been the subject of much controversy. In this chapter, we describe the state-of-the-art of this subject and we present many examples in favor of and against the presence of MW effects with a critical appraisal.Microwaves in Organic Synthesis, Third Edition.

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Microwave Synthesis of CdSe and CdTe Nanocrystals in Nonabsorbing Alkanes

Cited by 138 publications

References 66 publications

Anisotropic3DColloidal Quantum Nanostructures

Anisotropic3DColloidal Quantum Nanostructures

Microwaves as a synthetic route for preparing electrochemically active TiO₂ nanoparticles

Elucidation of Microwave Effects: Methods, Theories, and Predictive Models

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Microwave Synthesis of CdSe and CdTe Nanocrystals in Nonabsorbing Alkanes

Cited by 138 publications

References 66 publications

Anisotropic3DColloidal Quantum Nanostructures

Anisotropic3DColloidal Quantum Nanostructures

Microwaves as a synthetic route for preparing electrochemically active TiO2 nanoparticles

Elucidation of Microwave Effects: Methods, Theories, and Predictive Models

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Microwaves as a synthetic route for preparing electrochemically active TiO₂ nanoparticles