Evolutionary Shape Control During Colloidal Quantum‐Dot Growth

Nair, P. Sreekumari; Fritz, Karolina P.; Scholes, Gregory D.

doi:10.1002/smll.200600558

Cited by 62 publications

(75 citation statements)

References 41 publications

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“…Moreover, with extra injections of both Cd and Se precursors, a similar morphological transformation from rods to pyramids has recently been reported for CdSe nanoparticles [25].…”

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confidence: 70%

Quantum Dot Attachment and Morphology Control by Carbon Nanotubes

et al. 2007

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Novel applications in nanotechnology rely on the design of tailored nano-architectures. For this purpose, carbon nanotubes and nanoparticles are intensively investigated. In this work we study the influence of non-functionalized carbon nanotubes on the synthesis of CdSe nanoparticles by means of organometallic colloidal routes. This new synthesis methodology does not only provide an effective path to attach nanoparticles non-covalently to carbon nanotubes but represents also a new way to control the shape of nanoparticles.There is an increasing number of potential applications for materials with dimensions in the nanometer range. Such systems show improved or even new properties emerging as a result of electronic confinement. In particular, carbon nanotubes (CNTs) find applications as transistors [1, 2], conductive layers [3], field emitters [4,5], and mechanical components [6,7,8]. At the same time, the knowledge acquired from well-established synthetic procedures has facilitated the tailoring and optimization of semiconductor nanoparticles (NPs) with efficient, photostable luminescence properties controlled by quantization [9,10,11].

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“…Moreover, with extra injections of both Cd and Se precursors, a similar morphological transformation from rods to pyramids has recently been reported for CdSe nanoparticles [25].…”

supporting

confidence: 70%

Quantum Dot Attachment and Morphology Control by Carbon Nanotubes

et al. 2007

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“…[37,[66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83] A special aspect of this work is the control that can be exercised on shape, and here I will describe how that happens from a thermodynamic point of view. A key conclusion is that it is the G. D. Scholes / Controlling the Optical Properties of Inorganic Nanoparticles Figure 3.…”

Section: Control Of Shape In Colloidal Growthmentioning

confidence: 99%

“…Realizing that the synthesis of nanocrystals involves annealing to attain an equilibrium shape, which is close to spherical for a homogeneous passivating ligand, Figure 4a, we can think about how that shape can be altered. [37] The system free energy F at equilibrium satisfies…”

Section: Control Of Shape In Colloidal Growthmentioning

confidence: 99%

“…D. Scholes / Controlling the Optical Properties of Inorganic Nanoparticles c) The resulting rod shape must be stabilized by non-uniform ligand coverage so that the surface tension is lowered on the sides relative to the ends in order to compensate for the excess volume change. d)-f) CdSe rods, bullets, and pyramids show that growth can be directed in a unique direction along the c-axis by changing the ligand composition as a function of growth stage [37].…”

Section: Control Of Shape In Colloidal Growthmentioning

confidence: 99%

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Controlling the Optical Properties of Inorganic Nanoparticles

Scholes¹

2008

Adv Funct Materials

230

198

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The sophistication with which we can now prepare and characterize inorganic nanoparticles has inspired new areas of research into the fundamental properties and applications of these fascinating nanoscale systems. In this article some of the recent ideas concerning control of their optical properties are examined and explained, focusing on semiconductor nanocrystals. It is known that the optical properties of nanocrystals can be size‐tunable, but it is less obvious how shape matters. To explain how size as well as shape matters, the electronic structure of nanocrystals is sketched in relatively simple terms, leading to an introduction to deeper concepts at the heart of spectroscopy such as the exciton fine structure. The exciton fine structure states, although obscured by inhomogeneous line broadening, dictate selection rules for optical excitation. These viewpoints are compared and contrasted to well‐established principles in molecular spectroscopy that provide inspiration as well as perspective. The control of optical poperties is founded on our ability to prepare good quality colloidal particles. Recent advances in nanocrystal shape control are described. The current status of heterostructures is examined, with an emphasis on charge separation in CdSe–CdTe nanorods.

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“…Several works have reported on chemical and photochemical processes taking place during the growth of semiconductor NCs in the presence of halide or acetate anions [8]. Changes in the capping ligand sphere triggered by halogen compounds may provoke transformations of the NCs shape [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Role of Halogens in the Synthesis of Semiconductor Nanocrystals

Juárez¹

2014

Zeitschrift Für Physikalische Chemie

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Abstract:The presence of halogen compounds in the synthesis of semiconductor nanocrystals (NCs) produced by hot injection drastically influence their capping ligand sphere and/or chemical reactivity, allowing for the growth of hybrid systems, including composites combining NCs decorating carbon sp 2 surfaces. As a result, the presence of halide anions on the surface of some NCs has proven to have a positive impact on the optical and electrical properties. In this work the effects that halogen co-solvents (including alkylchlorides, bromides, and iodides) induce in the synthesis of rod-like Wurtzite CdSe NCs generated by hot-injection will be reviewed. The proposed mechanism of the reaction as well as a detailed characterization of the capping ligand sphere by Nuclear Magnetic Resonance (NMR) and X-Ray photoelectron Spectroscopy (XPS) will be discussed. Correlated cyclic voltammetry (CV) and XPS studies have been performed to address the effect of the halide anions on the NCs surface. Finally an example of the effect of the addition of chlorine-containing co-solvents on the synthesis of PbS rock-salt NCs will be shown.

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Evolutionary Shape Control During Colloidal Quantum‐Dot Growth

Cited by 62 publications

References 41 publications

Quantum Dot Attachment and Morphology Control by Carbon Nanotubes

Quantum Dot Attachment and Morphology Control by Carbon Nanotubes

Controlling the Optical Properties of Inorganic Nanoparticles

The Role of Halogens in the Synthesis of Semiconductor Nanocrystals

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