Quantum Dots

Parak, Wolfgang J.; Manna, Liberato; Simmel, Friedrich C.; Gerion, Daniele; Alivisatos, Paul

doi:10.1002/9783527631544.ch2

Cited by 6 publications

(4 citation statements)

References 152 publications

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“…Under oxidative conditions (air), complete combustion of pristine, micrometer-sized sulfur particles (powder) mainly appeared at a temperature higher than 275 °C and terminated at a temperature of about 400 °C. This is surprisingly also the case for nanoparticulate sulfur encapsulated inside the DUT-86-1 pore structure, although nanoparticles are known to exhibit higher reactivity than the bulk material due to their high particle surface-to-volume ratio . The reason therefore is most likely the insufficient accessibility of sulfur particles due to the high pore-filling degree and blockage slowing the reaction kinetics due to mass transport (O 2 ) limitation.…”

Section: Resultsmentioning

confidence: 88%

“…This is surprisingly also the case for nanoparticulate sulfur encapsulated inside the DUT-86-1 pore structure, although nanoparticles are known to exhibit higher reactivity than the bulk material due to their high particle surface-to-volume ratio. 56 The reason therefore is most likely the insufficient accessibility of sulfur particles due to the high pore-filling degree and blockage slowing down the reaction kinetics due to mass transport (O 2 ) limitation. In contrast, the combustion of sulfur particles inside DUT-86-2 already appeared in a significant lower temperature range of 250 -350 °C.…”

Section: Carbide-derived Carbon/sulfur Composites (Dut-86/s) and Elecmentioning

confidence: 99%

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Nanocasting Hierarchical Carbide-Derived Carbons in Nanostructured Opal Assemblies for High-Performance Cathodes in Lithium–Sulfur Batteries

et al. 2014

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Silica nanospheres are used as templates for the generation of carbide-derived carbons with monodisperse spherical mesopores (d=20-40 nm) and microporous walls. The nanocasting approach with a polycarbosilane precursor and subsequent pyrolysis, followed by silica template removal and chlorine treatment, results in carbide-derived carbons DUT-86 (DUT=Dresden University of Technology) with remarkable textural characteristics, monodisperse, spherical mesopores tunable in diameter, and very high pore volumes up to 5.0 cm3 g(-1). Morphology replication allows these nanopores to be arranged in a nanostructured inverse opal-like structure. Specific surface areas are very high (2450 m2 g(-1)) due to the simultaneous presence of micropores. Testing DUT-86 samples as cathode materials in Li-S batteries reveals excellent performance, and tailoring of the pore size allows optimization of cell performance, especially the active center accessibility and sulfur utilization. The outstanding pore volumes allow sulfur loadings of 80 wt %, a value seldom achieved in composite cathodes, and initial capacities of 1165 mAh gsulfur(-1) are reached. After 100 cycle capacities of 860 mAh gsulfur(-1) are retained, rendering DUT-86 a high-performance sulfur host material.

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Section: Resultsmentioning

confidence: 88%

Section: Carbide-derived Carbon/sulfur Composites (Dut-86/s) and Elecmentioning

confidence: 99%

Nanocasting Hierarchical Carbide-Derived Carbons in Nanostructured Opal Assemblies for High-Performance Cathodes in Lithium–Sulfur Batteries

et al. 2014

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“…Alivisatos et al managed to electrically address individual immobilized 5.8 nm Au nanoparticle from solution inside a nanoelectrode gap. [ 9 ] By measuring the I/U characteristic at 77 K, classical Coulomb blockade effects could be observed. Sato et al conducted first experimental attempts in order to build up a single electron transistor formed by ca.…”

Section: Introductionmentioning

confidence: 99%

Integration of Individual Functionalized Gold Nanoparticles into Nanoelectrode Configurations: Recent Advances

2020

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Chemically synthesized gold nanoparticles (AuNPs) have attracted much interest for application in various technologically relevant fields including nanoelectronics. In this particular research area, the most promising approach to take full advantage of the tunability in size, shape, and ligand composition of nanoparticles is the integration of a well‐defined number of AuNPs into a nanoscale device. This short review highlights recent progress in the introduction of AuNP into nanoelectronic circuitry by means of selected examples, that demonstrate a “proof‐of‐concept”. Synthetic concepts to obtain isotropic and Janus‐like particles as well as lithographic techniques that allow for the fabrication of nanoelectrode structures, which enable the electrical addressing of individual nanoparticles, are presented. A particular focus of this work is the question of how distinct molecular properties can be addressed in a technologically applicable device geometry by controlling the molecular functionalities in the proximity of semiconductor technology.

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“…In some commercial television screens, NPs of CdSe and other types of QDs are employed as filters in the backlighting units of liquid crystal displays (LCDs). It is well known that in colloidal NPs like CdS and CdSe the optical properties of QDs are size dependent: emission and absorption depends on the size d because of quantum size effects [1]. This means that the color of the emitted and absorbed light in a QD can be finely tuned with the proper choice of d, in a range approximately between 2-7 nm (see figure 1).…”

Section: Introductionmentioning

confidence: 99%

Low pressure bottom-up synthesis of metal@oxide and oxide nanoparticles: control of structure and functional properties

D’Addato

Spadaro

2018

Phys. Scr.

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The experimental activity on core@shell, metal@oxide and oxide nanoparticles (NP) grown with physical synthesis, and more specifically by low pressure gas aggregation sources (LPGAS) is reviewed, through a selection of examples encompassing some potential application in nanotechnology. After an introduction on applications of NP, a brief description of the main characteristics of the growth process of clusters and NP in the LPGAS is given. Successively, some relevant case studies are reported: • Formation of native oxide shells around the metal cores in core@shell NP. • Experimental efforts to obtain magnetic stabilization in magnetic core@shell NP by controlling their structure and morphology. • Recent advancements in NP source design and new techniques of co-deposition, with relevant results in realization of NP with greater variety of functionalities. • Recent results on reducible oxides NP, with potentialities in nano-catalysis, energy storage and other applications. Although this list is far from being exhaustive, aim of the authors is to give the reader in a descriptive way some glimpse of the physics behind the growth and the studies of low pressure gasphase synthesized NP, with their ever-growing potentialities for a rational design of new functional materials.

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Quantum Dots

Cited by 6 publications

References 152 publications

Nanocasting Hierarchical Carbide-Derived Carbons in Nanostructured Opal Assemblies for High-Performance Cathodes in Lithium–Sulfur Batteries

Nanocasting Hierarchical Carbide-Derived Carbons in Nanostructured Opal Assemblies for High-Performance Cathodes in Lithium–Sulfur Batteries

Integration of Individual Functionalized Gold Nanoparticles into Nanoelectrode Configurations: Recent Advances

Low pressure bottom-up synthesis of metal@oxide and oxide nanoparticles: control of structure and functional properties

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