Nonclassical nucleation and growth of inorganic nanoparticles

Lee, Sang Hoon; Yang, Jiwoong; Kwon, Soon Gu; Hyeon, Taeghwan

doi:10.1038/natrevmats.2016.34

Cited by 373 publications

(352 citation statements)

References 205 publications

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“…2e), because overcoating the core QDs with wide band gap shell materials passivates surface defects and confines excitons to the cores. [38][39][40][41][42][43] This leads to significant improvements in stability and the photoluminescence quantum yield (PLQY) that is directly proportional to the external quantum efficiency (EQE = n × χ × η PL × η oc ). For example, CdSe/ZnS QDs exhibit high PLQY of 70-95%, which is an order of magnitude higher than that of bare QDs.…”

Section: Materials Design For Efficient Qledsmentioning

confidence: 99%

Flexible quantum dot light-emitting diodes for next-generation displays

et al. 2018

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In the future electronics, all device components will be connected wirelessly to displays that serve as information input and/or output ports. There is a growing demand of flexible and wearable displays, therefore, for information input/output of the nextgeneration consumer electronics. Among many kinds of light-emitting devices for these next-generation displays, quantum dot light-emitting diodes (QLEDs) exhibit unique advantages, such as wide color gamut, high color purity, high brightness with low turn-on voltage, and ultrathin form factor. Here, we review the recent progress on flexible QLEDs for the next-generation displays. First, the recent technological advances in device structure engineering, quantum-dot synthesis, and high-resolution full-color patterning are summarized. Then, the various device applications based on cutting-edge quantum dot technologies are described, including flexible white QLEDs, wearable QLEDs, and flexible transparent QLEDs. Finally, we showcase the integration of flexible QLEDs with wearable sensors, micro-controllers, and wireless communication units for the next-generation wearable electronics.

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Section: Materials Design For Efficient Qledsmentioning

confidence: 99%

Flexible quantum dot light-emitting diodes for next-generation displays

et al. 2018

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“…[17] Developing ar ational understanding of the growth mechanisms of NCs is necessary to control morphology at the atomistic level. [18,21,22] These locally stable intermediates,s oc alled magic-sized clusters,are characterized by their molecule-like monodispersity,u nusual stability,a nd in many cases their ability to seed the growth of kinetically accessible nanomaterial morphologies such as nanobelts,p latelets,a nd pyramids. [12,[18][19][20] Theexistence of nonclassical cluster intermediates during crystal growth has been shown to have profound implications on the growth kinetics of NCs.…”

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confidence: 99%

Templated Growth of InP Nanocrystals with a Polytwistane Structure

Ritchhart

Cossairt

2018

Angewandte Chemie

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We have synthesized InP nanocrystals of an unprecedented crystal phase at low temperature (35-100 8 8C) by templated growth of InP magic-sizedc lusters.W itht he addition of stoichiometric equivalents of P(SiMe 3 ) 3 to the starting cluster,w ed emonstrate nanocrystal growth mediated through ap artial dissolution and recrystallization pathway. This growth process was monitored using ac ombination of in situ UV/Vis and 31 PNMR spectroscopy, revealing the intermediacy of smaller cluster species of higher symmetry. The nanocrystals that result from this templated growth exhibit ac rystal structure that is neither zincblende nor wurtzite,a nd instead is derived from the original cluster.This structure is best described as a3 Dp olytwistane phase as deduced from ac ombination of X-ray diffraction, Raman, and solid-state NMR spectroscopym ethods.

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“…The initial process occurs very fast and eventually reaches a steady state, at which apparently no more interaction is perceived for a long time. It was previously reported that damage from electron radiation influences the behavior of such NPs . Depending on the type of bonding and the environment, radiolysis or knock‐on causes the removal of the capping of the AuNPs and leaves a bare surface, which thus promotes contact between the neighboring AuNPs .…”

Section: Resultsmentioning

confidence: 99%

“…The drift experienced in our observations suggests that the intervening substance between the AuNPs is removed at the moment of observation. The observed process of AuNP growth can be divided into four stages: 1) AuNP movement and rotation; 2) necking mechanism; 3) orientated attachment at matching facets; 4) subsequent reshaping or restructuring of the AuNPs by surface diffusion to lower the surface energy (Figures d–i). During this process, the AuNPs wiggle and/or reorient to meet similar facets from other nearby NPs .…”

Section: Resultsmentioning

confidence: 99%

Successful Synthesis of Gold Nanoparticles through Ultrasonic Spray Pyrolysis from a Gold(III) Nitrate Precursor and Their Interaction with a High Electron Beam

et al. 2018

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Herein, we report for the first time the successful preparation of a gold(III) nitrate [Au(NO3)3] water‐based precursor for use in a bottom‐up ultrasonic spray pyrolysis (USP) process. Due to its limited solubility in water, the precursor was prepared under reflux conditions with nitric acid (HNO3) as the solvent and ammonium hydroxide (NH4OH) as a neutralizer. This precursor enabled the USP synthesis of gold nanoparticles (AuNPs) and the in situ formation of low concentrations of NO2 − and NO3 − ions, which were caught directly in deionized water in a collection system. These ions were proven to act as stabilizers for the AuNPs. Investigations showed that the AuNPs were monodispersed and spherically shaped with a size distribution over three groups: the first contained 5.3 % AuNPs with diameters (2 r) <15 nm, the second contained 82.5 % AuNPs with 2 r between 15 and 200 nm, and the third contained 12.2 % AuNPs with 2 r>200 nm. UV/Vis spectroscopy revealed the maximum absorbance band of the AuNPs at λ=528 nm. Additionally, scanning transmission electron microscopy (STEM) observations of the smallest AuNPs (2 r<5 nm) revealed atomically resolved coalescence phenomena induced by interaction with the electron beam. Four stages of the particle‐growth process were distinguished: 1) movement and rotation of the AuNPs; 2) necking mechanism; 3) orientated attachment at matching facets; 4) reshaping of the AuNPs by surface diffusion. This provided important insight into the formation/synthesis process of the AuNPs.

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Nonclassical nucleation and growth of inorganic nanoparticles

Cited by 373 publications

References 205 publications

Flexible quantum dot light-emitting diodes for next-generation displays

Flexible quantum dot light-emitting diodes for next-generation displays

Templated Growth of InP Nanocrystals with a Polytwistane Structure

Successful Synthesis of Gold Nanoparticles through Ultrasonic Spray Pyrolysis from a Gold(III) Nitrate Precursor and Their Interaction with a High Electron Beam

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