Spontaneous Organization of Single CdTe Nanoparticles into Luminescent Nanowires

Tang, Zhiyong; Kotov, Nicholas A.; Giersig, Michael

doi:10.1126/science.1072086

Cited by 1,838 publications

(1,956 citation statements)

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“…7 Assuming a 3.1 nm interparticle separation (from our own measurements on CdSe NCs), eq 4 yields an upper estimate of ∼-0.6 k B T at room temperature for the interparticle interaction if the dipole moment is 100 D. This interaction is too small to account for the anisotropic nanocrystals grown via oriented attachment. 1,3,4 As is demonstrated by Figure 1, for strong dipolar interactions, large aggregates are expected at high concentrations with a highly one-dimensional character. With magnetic colloids that form magnetic equilibrium structures according to cryo-TEM, it has been demonstrated that the response to an alternating field occurs at frequencies corresponding to the (slow) rotation of the dipolar structures.…”

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confidence: 68%

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Dipolar Structures in Colloidal Dispersions of PbSe and CdSe Quantum Dots

et al. 2007

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We show by cryogenic transmission electron microscopy that PbSe and CdSe nanocrystals of various shapes in a liquid colloidal dispersion self-assemble into equilibrium structures that have a pronounced dipolar character, to an extent that depends on particle concentration and size. Analyzing the cluster-size distributions with a one-dimensional (1D) aggregation model yields a dipolar pair attraction of 8−10 k B T at room temperature. This accounts for the long-range alignment of the crystal planes of individual nanocrystals in self-assembled superstructures and for anisotropic nanostructures grown via oriented attachment.

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confidence: 68%

“…[1][2][3][4] An example is the growth of single-crystalline nanowires from PbSe NCs, which indicates that the particles attach to each other in a precise orientation. 3 The origin of the underlying directive force observed for various types of nanocrystals is still under debate.…”

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Dipolar Structures in Colloidal Dispersions of PbSe and CdSe Quantum Dots

et al. 2007

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“…51 This dipole−dipole attraction between particles was strong enough to drive the aggregation of nanoparticles. 52 The aggregation of small AgNPs and further reduction Ag + to Ag 0 could induce the fusion and growth of nanoparticles and result in formation of larger AgNPs. Therefore, the photo-and heat-induced AgNPs result in varying size-distribution patterns.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Photoreduction and Stabilization Capability of Molecular Weight Fractionated Natural Organic Matter in Transformation of Silver Ion to Metallic Nanoparticle

Yin

Shen²,

Zhou³

et al. 2014

Environ. Sci. Technol.

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Photoinduced reduction of silver ion (Ag + ) to silver nanoparticles (AgNPs) by dissolved organic matter (DOM) plays a crucial role in the transformation and transport of engineered AgNPs and Ag + in aquatic environments. DOM is a mixture of natural polymers with wide molecular weight (MW) distribution, and the roles of specific components of DOM in the photoreduction of Ag + to AgNPs are still not understood. In this study, MW fractionated natural organic matter (M f -NOM) were investigated for their roles on the photoreduction process and stabilization of the formed AgNPs. This photoinduced reduction process depends highly on pH, concentration of Ag + and NOM, light quality, and the MW of M f -NOM. Monochromatic radiation and light attenuation correction suggested that the difference of M f -NOM on reduction was mainly ascribed to the differential light attenuation of M f -NOM rather than the "real" reductive ability. More importantly, compared with low MW fractions, the high MW M f -NOMs exhibit drastically higher capability in stabilizing the photosynthesized AgNPs against Ca 2+ -induced aggregation. This finding is important for a better understanding of the differential roles of M f -NOM in the transformation and transport of Ag + and engineered AgNPs in DOMrich surface water.

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“…One-dimensional nanowires [2] and twodimensional free-floating sheets have been developed by strong dipole-dipole interaction [3]. To structure matter on the scale of length comparable or smaller to the wavelength of light can deliver phenomenal optical properties [4,5].…”

Section: Last and Final Versionmentioning

confidence: 99%

Predictor Packing in Developing Unprecedented Shaped Colloidal Particles

Ali¹,

Lin²,

Yeh³

2018

Preprint

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-Developing particles of different anisotropic shapes are the hot topic since decades as they guarantee some special features of properties not possible through other means. Again, controlling atoms to develop certain size and shape particle is a quite challenging job. In this study, gold particles of different shapes are developed via pulse-based electronphoton-solution interface process. Gold atoms of certain transition state develop monolayer assembly at solution surface around the light glow (known in argon plasma) being generated at bottom of copper capillary (known in cathode). The rate of uplifting gold atoms to solution surface is being controlled by forcing energy (travelling photons) pursuing electrons and high energy photons (in high density) entering to solution. Gold atoms dissociated from the precursor under dissipating heat energy into the solution supplied under propagating photons characteristic current through immersed graphite rod (known in anode). Placing packets of nano shape energy of tuned pulse protocol over compact monolayer assembly comprising transition state atoms develop tiny-sized particles of formed shape. On separation of joint tiny particles into two equilateral triangular-shaped tiny particles, exerting forces of surface format elongate atoms of one-dimensional arrays converting them into structures of smooth elements. Due to immersing level of force, such tiny-shaped particles pack from Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted:

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Spontaneous Organization of Single CdTe Nanoparticles into Luminescent Nanowires

Cited by 1,838 publications

References 20 publications

Dipolar Structures in Colloidal Dispersions of PbSe and CdSe Quantum Dots

Dipolar Structures in Colloidal Dispersions of PbSe and CdSe Quantum Dots

Photoreduction and Stabilization Capability of Molecular Weight Fractionated Natural Organic Matter in Transformation of Silver Ion to Metallic Nanoparticle

Predictor Packing in Developing Unprecedented Shaped Colloidal Particles

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