quantum dots


Surface functionalized carbogenic quantum dots
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Quantum dots are semiconductor nanocrystals that inherently ffuoresce at specific wavelengths in the visible, enabling a number of potential applications to be realized. However, conventional quantum dots are based on metallic elements, which has raised

Quantum dots as photosensitizers
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NATURE BIOTECHNOLOGY VOLUME 22 NUMBER 11 NOVEMBER 2004 1361 easily available. Third, it is nontoxic in the absence of light. Fourth, it possesses target specificity and localizes into the target tissue (eg, tumor) as selectively as possible. Fifth, its Φt is high The enormous potential of science and technology on nanoscale to impact on industrial output has been recognised all over the world. One emerging area of nanoscience being at the interface of chemistry, physics, biology and materials science is the field of

Quantum dots versus organic dyes as fluorescent labels
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Suitable labels are at the core of luminescence and fluorescence imaging and sensing. One of the most exciting, yet also controversial, advances in label technology is the emerging development of quantum dots (QDs) inorganic nanocrystals with unique optical and Worldwide, many researchers are fascinated from the rich physics of semiconductor quantum dots (QDs) and their high potential for applications in photonics and quantum information technology. QDs are nanometer-sized three-dimensional structures which

The photoluminescence mechanism in carbon dots (graphene quantum dots carbon nanodots, and polymer dots ): current state and future perspective
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At present, the actual mechanism of the photoluminescence (PL) of fluorescent carbon dots (CDs) is still an open debate among researchers. Because of the variety of CDs, it is highly important to summarize the PL mechanism for these kinds of carbon materials; doing so can

Optically active quantum dots in monolayer WSe2
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Semiconductor quantum dots have emerged as promising candidates for the implementation of quantum information processing, because they allow for a quantum interface between stationary spin qubits and propagating single photons 3. In the

Semiconductor quantum dots
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ABSTRACT I describe a new strategy for predicting the electronic properties ofzero- dimensional semiconductor quantum dots including the excitonic spectrum. This methodology was applied recently to both free standing (eg colloidal) and t semiconductor

Use of quantum dots for live cell imaging
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Monitoring interactions within and among cells as they grow and differentiate is a key to understanding organismal development. Fluorescence microscopy is among the most widely used approaches for highresolution, noninvasive imaging of live organisms and

Differences in subcellular distribution and toxicity of green and red emitting CdTe quantum dots
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Quantum dots (QDs) are emerging as alternative or complementary tools to the organic fluorescent dyes currently used in bioimaging. QDs hold several advantages over conventional fluorescent dyes including greater photostability and a wider range of

Origin and control of blinking in quantum dots
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Semiconductor nanocrystals offer an enormous diversity of potential device applications, based on their size-tunable photoluminescence, high optical stability andbottom- upchemical approaches to self-assembly. However, the promise of such applications can be

Single electron charging effects in semiconductor quantum dots
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We have studied charging effects in a lateral split-gate quantum dot defined by metal gates in the two dimensional electron gas (2 DEG) of a GaAs/AlGaAs heterostructure. The gate structure allows an independent control of the conductances of the two tunnel barriers

Efficient and stable white LEDs with silica‐coated inorganic perovskite quantum dots
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In spite of the high brightness of the perovskite QDs, their instability and the anion-exchange reaction between different halide QD particles when used together are still the major issues that obstruct their practical applications. It is an urgent need to develop a facile, mass Many people worldwide are fascinated from quantum information science and from the prospects of novel quantum technologies, such as quantum computing, quantum communication, quantum metrology, and quantum sensing. Semiconductor quantum dots

Engineering Luminescent Quantum Dots for In Vivo Molecular and Cellular Imaging
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Semiconductor quantum dots are luminescent nanoparticles that are under intensive development for use as a new class of optical imaging contrast agents. Their novel properties such as optical tunability, improved photostability, and multicolor light emission

Shape and stability of quantum dots
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The formation of dislocation-free three-dimensional islands by heteroepitaxial growth of lattice mismatched materials is utilized to produce partially ordered arrays of quantum dots . The equilibrium shape of these islands results from the competition between surface and

Physics of the artificial atoms: Quantum dots in a magnetic field
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Quantum dots (quasi-zero-dimensional electron systems) are one of the most interesting systems in semiconductor nanostructures and have received considerable attention recently. 1-2 With todays rapid advances in microfabrication technology, it has been

Meta-analysis of cellular toxicity for cadmium-containing quantum dots
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Understanding the relationships between the physicochemical properties of engineered nanomaterials and their toxicity is critical for environmental and health risk analysis. However, this task is confounded by material diversity, heterogeneity of published data and

Clinical potential of quantum dots
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Advances in nanotechnology have led to the development of novel fluorescent probes called quantum dots . Quantum dots have revolutionalized the processes of tagging molecules within research settings and are improving sentinel lymph node mapping and

Imaging the lateral diffusion of membrane molecules with quantum dots
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This protocol describes a sensitive approach to tracking the motion of membrane molecules such as lipids and proteins with molecular resolution in live cells. This technique makes use of fluorescent semiconductor nanocrystals, quantum dots (QDs), as a probe to detect

Synthesis of CdS quantum dots by mechanochemical reaction
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2+ Na 2 S→ CdS+ 2NaCl induced by mechanical milling resulted in the formation of CdS particles with an average diameter of 8 nm. The average particle size was controlled within the range of 4 to 8 nm by varying the size of the grinding media. The onset energy of optical

Patterning nanoroads and quantum dots on fluorinated graphene
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Using ab initio methods we have investigated the fluorination of graphene and find that different stoichiometric phases can be formed without a nucleation barrier, with the complete 2D-Teflon CF phase being thermodynamically most stable. The fluorinated graphene is an

Optical control of one and two hole spins in interacting quantum dots
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A single hole spin in a semiconductor quantum dot has emerged as a quantum bit that is potentially superior to an electron spin. A key feature of holes is that they have a greatly reduced hyperfine interaction with nuclear spins, which is one of the biggest difficulties in

Carbon quantum dots
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Since their discovery (or one might rather call first synthesis ) approximately 10 years ago, carbon quantum dots (first identified as carbon nanoparticles , but later adopted the term Carbon- Dots , evoking similarities to the widely studied inorganic quantum dots ) and their With the development of nanotechnology, nanometer-sized products smaller than several 100 nm have been applied for all areas of science and technology. The nanometer-sized products, including carbon nanotubes, fullerene derivatives, and nanocrystals made of

Phosphors, up conversion nano particles, quantum dots and their applications
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This book is divided into two volumes. In Volume we start with an introduction to the basic properties of luminescent materials (phosphors) before addressing the principle of energy transfer and the pressure effect of phosphor. Moreover, we present the theoretical firstA facile one-pot microwave irradiation reduction route has been developed for the synthesis of highly luminescent CdTe quantum dots using Na 2 TeO 3 as the Te source in an aqueous environment. The synthesis parameters of this simple and rapid approach, including the

Pure colors from core shell quantum dots
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Thirty years after the discovery of the quantum confinement effect in semiconductor nanocrystal quantum dots (QDs), 1 3 20 years after the introduction of a chemical method for colloidal semiconductor QDs with low size dispersion and high crystalline quality, 4 and

Highly sensitive determination of theophylline based on graphene quantum dots modified electrode
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In this study we introduce a novel modification for the surface of screen-printed electrode (SPE) by graphene quantum dot (GQD) in order to be used in the determination and detection of theophylline. An uncomplicated technique was employed to stabilize GQD on

Preparation of chiral quantum dots
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Chiral quantum dots (QDs) are expected to have a range of potential applications in photocatalysis, as specific antibacterial and cytotoxic drug-delivery agents, in assays, as sensors in asymmetric synthesis and enantioseparation, and as fluorescent chiral

Controlling spin qubits in quantum dots
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We review progress on the spintronics proposal for quantum computing where the quantum bits (qubits) are implemented with electron spins. We calculate the exchange interaction of coupled quantum dots and present experiments, where the exchange coupling is measured Purpose To date, the in vivo imaging of quantum dots (QDs) has been mostly qualitative or semiquantitative. The development of a dual-function positron emission tomography (PET)/near-infrared fluorescence (NIRF) probe might allow the accurate assessment of the

Encapsulation of single quantum dots with mesoporous silica
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A new generation of silica encapsulated single quantum dots (QDs) was synthesized based on recent breakthroughs made in coating magnetic nanoparticles and their clusters. In comparison with the traditional St ber sol gel method, this new approach is significantlySemiconductor nanoparticles ( quantum dots ) are promising fluorescent markers, but it is very little known about interaction of quantum dots with biological molecules. In this study, interaction of CdTe quantum dots coated with thioglycolic acid (TGA) with bovine serum We use low temperature (10K) optical hole-burning and fluorescence line narrowing spectroscopy to investigate the electronic properties of CdSe nanocrystallites ( quantum dots ) as a function of crystallite diameter (20 80Å). We discuss how the homogeneous

Cadmium-containing quantum dots : properties, applications, and toxicity
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The marriage of biology with nanomaterials has significantly accelerated advancement of biological techniques, profoundly facilitating practical applications in biomedical fields. With unique optical properties (eg, tunable broad excitation, narrow emission spectra, robust

Interfacial Elasticity Corrections to Size‐Dependent Strain‐State of Embedded Quantum Dots
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Introduction Quantum Dots (QDs) have recently been the focus of several experimental and theoretical researchers due to the promise of improved and new opto-electronic properties . Frequently, embedded QD structures (eg InAs/GaAs system), to preserve coherency This review highlights recent advances in the use of quantum dots (QDs) as luminescent sensors. The bulk of the study concentrates on systems that possess organic ligands bound to the surface of QDs. These ligands vary from low molecular weight thiols to larger

Ultrafast preparation of black phosphorus quantum dots for efficient humidity sensing
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Black phosphorus quantum dots (BPQDs) have been prepared by a high turbulent shear rate generated from a household kitchen blender. A layer-by-layer disintegration mechanism of bulk BP crystals is suggested. Assynthesized BPQDs have shown excellent humidity Water-soluble and stable CdTe quantum dots (QDs) were synthesized in aqueous solution with glutathione (GSH) as the stabilizer. GSH is employed by nature to detoxify heavy metal ions. As a result of specific interaction, the fluorescence intensity of GSH-capped QDs is