Self‐Assembly of Inorganic Nanocrystals: Emergence of a New Physics

Pileni, Marie‐Paule

doi:10.1002/masy.200851003

Cited by 4 publications

(2 citation statements)

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“…Self-assembled doped oxide nanostructures with specific morphology have attracted considerable attention in both fundamental research and potential application in recent years. − Incorporating metal ions of appropriate elements into host lattices yields a homogeneous mixed oxide solid-solution with desirable properties because the electronic state of the dopant is confined to a small volume as a quantum confinement . The interfacial interactions of the heterojunction nanocomposites originate from electron transfer across the nanometer contact at the interface of dopant atoms and particles .…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

Nguyen

Dinh

2011

Inorg. Chem.

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Undoped and cerium doped LaCO(3)OH annular-shaped nanoarchitectures with high specific surface area have been fabricated via the thermolysis of Ce(x)La(1-x)(oleate)(3) (x = 0-20 mol %) complexes in a toluene-water system containing tert-butylamine/oleylamine. The products exhibit 400 nm-sized monodisperse annular-shaped nanoarchitectures, which are constituted of 3-5 nm-sized primary particles. A possible mechanism of the reaction of Ce(x)La(1-x)(oleate)(3) and tert-butylamine for the formation of annular-shaped Ce(x)La(1-x)CO(3)OH nanoarchitectures is proposed. The thermal conversion of Ce(x)La(1-x)CO(3)OH to Ce(x)La(1-x)(CO(3))O(2) at 600 °C, to Ce(x)La(1-x)(OH)(3) at 800 °C, final to (Ce(x)La(1-x))(2)O(3-δ) at 900 °C were employed, while the original morphology was essentially unchanged. The dopant concentration was varied from 5 to 20 of cerium ions per LaCO(3)OH nanoparticle. The X-ray diffraction (XRD) results reveal that the cerium dopant could enter easily into the LaCO(3)OH structural lattice, whereas copper could unlikely enter into their lattice because of their large ionic radius difference. The cerium oxidation state was controlled by changing doping concentration. The X-ray photoelectron spectroscopy (XPS) results reveal that only one Ce(3+) oxidation state is in the as-synthesized Ce(x)La(1-x)CO(3)OH samples with cerium concentration ranging from 5 to 20 mol %, whereas both 3+ and 4+ ones coexisted in 20 mol % Ce:LaCO(3)OH structure. Remarkable luminescence emission intensity enhancement of 1.5-9.0 times were observed for Ce(x)La(1-x)CO(3)OH samples with cerium concentration ranging from 5 to 20 mol %, after doping with an undoped LaCO(3)OH.

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Section: Introductionmentioning

confidence: 99%

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

Nguyen

Dinh

2011

Inorg. Chem.

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“…While inorganic crystal in nanometer scale has been an area of intense investigation, [1,2] the subject of organic polymer nanocrystals in high purity is yet to be developed. We summarize here the first synthesis of conductive polymer nanocrystals with fast electronic conductance switching function developed in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

First Preparations and Characterization of Conductive Polymer Crystalline Nanoneedles

Nuraje

Zhang

et al. 2009

Macromolecular Symposia

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Single crystalline nanoneedles of three families of the most studied conductive organic polymers -polythiophene, polyaniline and polypyrrole -were synthesized for the first time using an interfacial polymerization process that takes place with simultaneous crystallization. As the crystal growth is concurrent with polymerization, more ordered crystal packing can be expected. Most of the bulk conducting-polymer systems studied contains regions that are inhomogeneous. Single nanocrystals of conducting polymers have not been reported, although needle-shaped bulk crystals of the quarterphenyl cation radical salt have previously been studied. The investigation of processes in a nanodomain of a single crystal is critical in ascertaining the inherent electronic properties of polymer nanoelements. The organic conductive nanoneedles were characterized using TEM, HRTEM, electron diffraction, EDS, and EPR to establish their crystal structure and composition. Scanning tunneling microscopy/spectroscopy (STM/STS) investigation were conducted to examine their electronic behaviors, leading to the discovery of a fieldinduced conductance switching with response times on the millisecond level. The switch voltages are in the range of 3 to 4 volts in STM experiments, consistent with the trend of the band gap of the three polymers. The organic conductive nanoneedles with nano-tip having high density of mobile electron may serve as interesting elements for nanoscale electronics.

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Selectively probing vibrations in a plasmonic supracrystal

Mante

Chen

Lin

et al. 2012

Applied Physics Letters

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The coupling of plasmonic resonances with the multiple phonon modes of a plasmonic supracrystal is studied. Ultrafast optical pump-probe spectroscopy with variable wavelength allows the selective detection of the breathing mode, the interparticle vibrations, and the vibration of the whole structure. Thanks to this selectivity, the characterization of the bonding strength between nanoparticles in different directions of the supracrystal is possible. The observation of these vibrations could be useful for the realization of future phonon modulated photonic and plasmonic devices.

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Self‐Assembly of Inorganic Nanocrystals: Emergence of a New Physics

Abstract: In this paper we demonstrate that ordering of nanocrystals on long distance in 3D superlatices called supra crystals permit to emerge of collective intrinsic properties, which was not expected. The shape of the organization at the mesoscopic scale also induces new physical properties.

Cited by 4 publications

References 53 publications

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

First Preparations and Characterization of Conductive Polymer Crystalline Nanoneedles

Selectively probing vibrations in a plasmonic supracrystal

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Self‐Assembly of Inorganic Nanocrystals: Emergence of a New Physics

Abstract: In this paper we demonstrate that ordering of nanocrystals on long distance in 3D superlatices called supra crystals permit to emerge of collective intrinsic properties, which was not expected. The shape of the organization at the mesoscopic scale also induces new physical properties.

Cited by 4 publications

References 53 publications

Two-Phase Synthesis of Colloidal Annular-Shaped CexLa1−xCO3OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

Two-Phase Synthesis of Colloidal Annular-Shaped CexLa1−xCO3OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

First Preparations and Characterization of Conductive Polymer Crystalline Nanoneedles

Selectively probing vibrations in a plasmonic supracrystal

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Product

Resources

About

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides

Two-Phase Synthesis of Colloidal Annular-Shaped Ce_xLa_1−xCO₃OH Nanoarchitectures Assemblied from Small Particles and Their Thermal Conversion to Derived Mixed Oxides