scholarly journals Semiconductor Nanorod Self-Assembly at the Liquid/Air Interface Studied by in Situ GISAXS and ex Situ TEM

Nano Letters ◽  
2012 ◽  
Vol 12 (11) ◽  
pp. 5515-5523 ◽  
Author(s):  
Francesca Pietra ◽  
Freddy T. Rabouw ◽  
Wiel H. Evers ◽  
Dima V. Byelov ◽  
Andrei V. Petukhov ◽  
...  
Keyword(s):  
Self Assembly ◽  
Ex Situ ◽  
Air Interface

A lotus-inspired janus hybrid film enabled by interfacial self-assembly and in situ asymmetric modification

2018 ◽  
Vol 54 (91) ◽  
pp. 12804-12807 ◽  
Author(s):  
Yun Liang ◽  
Jiangwei Shi ◽  
Peng Xiao ◽  
Jiang He ◽  
Feng Ni ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hybrid Film ◽  
Water Interface ◽  
Assembly Process ◽  
Lotus Leaf ◽  
Air Interface ◽  
Oil Water

A lotus leaf inspired Janus hybrid film was exquisitely fabricated through a self-assembly process on the water/air interface with subsequent in situ asymmetric modification at the oil/water interface. The interfacial asymmetric decoration strategy thus provides a novel pathway for achieving a 2D Janus hybrid film with asymmetric wettability and functionality.

Probing Self-Assembly of Cylindrical Morphology Block Copolymer Using in Situ and ex Situ Grazing Incidence Small-Angle X-ray Scattering: The Attractive Case of Graphoepitaxy

2014 ◽  
Vol 47 (20) ◽  
pp. 7221-7229 ◽  
Author(s):  
Mireille Maret ◽  
Raluca Tiron ◽  
Xavier Chevalier ◽  
Patrice Gergaud ◽  
Ahmed Gharbi ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Small Angle ◽  
Self Assembly ◽  
Grazing Incidence ◽  
Ex Situ ◽  
X Ray ◽  
X Ray Scattering ◽  
Attractive Case ◽  
Ray Scattering

scholarly journals Exploiting In-Situ NMR to Monitor the Formation of a Metal-Organic Framework

2019 ◽  
Author(s):  
Corey Jones ◽  
Colan Hughes ◽  
Hamish Yeung ◽  
Alison Paul ◽  
Kenneth D. M. Harris ◽  
...  
Keyword(s):  
Self Assembly ◽  
Metal Organic Framework ◽  
Quantitative Information ◽  
Ex Situ ◽  
Nmr Studies ◽  
In Situ Techniques ◽  
Liquid Phases ◽  
Nmr Study ◽  
Metal Organic

<p> </p><p>The formation processes of metal-organic frameworks are increasingly widely researched using in-situ techniques, although there remains a scarcity of NMR studies in the field. In this work, the synthesis of MFM-500(Ni) has been investigated using the Combined Liquid- And Solid-State In‑situ Crystallization NMR strategy, which provides information on the time-evolution of both solid and liquid phases during crystallization. In our NMR study, the liquid-phase NMR data recorded as a function of time at five fixed temperatures afford qualitative information on the solution-phase processes and quantitative information on the kinetic parameters of crystallization, allowing the activation energies for nucleation and growth to be determined. Ex-situ SAXS studies provide complementary nanoscale information on the rapid self-assembly prior to crystallisation, and in-situ PXRD confirms that the only crystalline phase present during the reaction is phase-pure MFM-500(Ni).<br></p>

Well-organised two-dimensional self-assembly controlled by in-situ formation of a Cu(II)-coordinated rufigallol derivative: a scanning tunnelling microscopy study

2022 ◽  
Author(s):  
Yoshihiro Kikkawa ◽  
Mayumi Nagasaki ◽  
Seiji Tsuzuki ◽  
Thierry Fouquet ◽  
Sayaka Nakamura ◽  
...  
Keyword(s):  
Self Assembly ◽  
Microscopy Study ◽  
Scanning Tunnelling Microscopy ◽  
Ex Situ ◽  
Metal Coordination ◽  
Two Dimensional ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
In Situ Formation

The two-dimensional self-assembly of rufigallol derivatives and their metal coordination were studied by scanning tunnelling microscopy. Ex-situ Cu(II)-coordinated rufigallol derivatives exhibited columnar structures with some defects, whereas regular and linear...

scholarly journals Contribution of Ex-Situ and In-Situ X-ray Grazing Incidence Scattering Techniques to the Understanding of Quantum Dot Self-Assembly: A Review

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2240
Author(s):  
Vishesh Saxena ◽  
Giuseppe Portale
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Structural Information ◽  
Grazing Incidence ◽  
Ex Situ ◽  
Mechanism Of Formation ◽  
Energy Medicine ◽  
X Ray ◽  
X Ray Scattering

Quantum dots are under intense research, given their amazing properties which favor their use in electronics, optoelectronics, energy, medicine and other important applications. For many of these technological applications, quantum dots are used in their ordered self-assembled form, called superlattice. Understanding the mechanism of formation of the superlattices is crucial to designing quantum dots devices with desired properties. Here we review some of the most important findings about the formation of such superlattices that have been derived using grazing incidence scattering techniques (grazing incidence small and wide angle X-ray scattering (GISAXS/GIWAXS)). Acquisition of these structural information is essential to developing some of the most important underlying theories in the field.

scholarly journals Exploiting In-Situ NMR to Monitor the Formation of a Metal-Organic Framework

2020 ◽  
Author(s):  
Corey Jones ◽  
Colan Hughes ◽  
Hamish Yeung ◽  
Alison Paul ◽  
Kenneth D. M. Harris ◽  
...  
Keyword(s):  
Self Assembly ◽  
Metal Organic Framework ◽  
Quantitative Information ◽  
Ex Situ ◽  
Nmr Studies ◽  
In Situ Techniques ◽  
Nmr Study ◽  
Metal Organic ◽  
In Situ Nmr

The formation processes of metal-organic frameworks are becoming more widely researched using in-situ techniques, although there remains a scarcity of NMR studies in this field. In this work, the synthesis of framework MFM-500(Ni) has been investigated using an in‑situ NMR strategy that provides information on the time-evolution of the reaction and crystallization process. In our in‑situ NMR study of MFM-500(Ni) formation, liquid-phase 1H NMR data recorded as a function of time at 5 fixed temperatures afford qualitative information on the solution-phase processes and quantitative information on the kinetics of crystallization, allowing the activation energies for nucleation and growth to be determined. Ex-situ SAXS studies provide complementary nanoscale information on the rapid self-assembly prior to MOF crystallization and in-situ powder X-ray diffraction confirms that the only crystalline phase present during the reaction is phase-pure MFM-500(Ni).

scholarly journals Exploiting In-Situ NMR to Monitor the Formation of a Metal-Organic Framework

2020 ◽  
Author(s):  
Corey Jones ◽  
Colan Hughes ◽  
Hamish Yeung ◽  
Alison Paul ◽  
Kenneth D. M. Harris ◽  
...  
Keyword(s):  
Self Assembly ◽  
Metal Organic Framework ◽  
Quantitative Information ◽  
Ex Situ ◽  
Nmr Studies ◽  
In Situ Techniques ◽  
Nmr Study ◽  
Metal Organic ◽  
In Situ Nmr

The formation processes of metal-organic frameworks are becoming more widely researched using in-situ techniques, although there remains a scarcity of NMR studies in this field. In this work, the synthesis of framework MFM-500(Ni) has been investigated using an in‑situ NMR strategy that provides information on the time-evolution of the reaction and crystallization process. In our in‑situ NMR study of MFM-500(Ni) formation, liquid-phase 1H NMR data recorded as a function of time at 5 fixed temperatures afford qualitative information on the solution-phase processes and quantitative information on the kinetics of crystallization, allowing the activation energies for nucleation and growth to be determined. Ex-situ SAXS studies provide complementary nanoscale information on the rapid self-assembly prior to MOF crystallization and in-situ powder X-ray diffraction confirms that the only crystalline phase present during the reaction is phase-pure MFM-500(Ni).

In Situ WetSTEM Observation of Gold Nanorod Self-Assembly Dynamics in a Drying Colloidal Droplet

2014 ◽  
Vol 20 (2) ◽  
pp. 385-393 ◽  
Author(s):  
Filip Novotný ◽  
Petr Wandrol ◽  
Jan Proška ◽  
Miroslav Šlouf
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Direct Method ◽  
Local Heating ◽  
Ex Situ ◽  
Transmission Electron ◽  
Nanoparticle Interactions ◽  
Scanning Transmission ◽  
Important Challenge

AbstractDirect in situ visualization of nanoparticles in a liquid is an important challenge of modern electron microscopy. The increasing significance of bottom-up methods in nanotechnology requires a direct method to observe nanoparticle interactions in a liquid as the counterpart to the ex situ electron microscopy and indirect scattering and spectroscopy methods. Especially, the self-assembly of anisometric nanoparticles represents a difficult task, and the requirement to trace the route and orientation of an individual nanoparticle is of highest importance. In our approach we utilize scanning transmission electron microscopy under environmental conditions to visualize the mobility and self-assembly of cetyltrimethylammonium bromide (CTAB)-capped gold nanorods (AuNRs) in an aqueous colloidal solution. We directly observed the drying-mediated AuNR self-assembly in situ during rapid evaporation of a colloidal droplet at 4°C and pressure of about 900 Pa. Several types of final AuNR packing were documented including side-by-side oriented chains, tip-to-tip loosely arranged nanorods, and domains of vertically aligned AuNR arrays. The effect of local heating by electron beam is used to qualitatively asses the visco-elastic properties of the formed AuNR/CTAB/water membrane. Local heating induces the dehydration and contraction of a formed membrane indicated either by its rupture and/or by movement of the embedded AuNRs.

Real-time tracking of the self-assembled growth of a 3D Ge quantum dot lattice in an alumina matrix

2020 ◽  
Vol 53 (4) ◽  
pp. 1029-1038
Author(s):  
Ashin Shaji ◽  
Maja Micetic ◽  
Yuriy Halahovets ◽  
Peter Nadazdy ◽  
Igor Matko ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Self Assembly ◽  
Temporal Evolution ◽  
Ion Beam ◽  
The Self ◽  
Ex Situ ◽  
X Ray ◽  
Self Assembled ◽  
Ge Quantum Dot

A laboratory in situ grazing-incidence small-angle X-ray scattering (GISAXS) tracking of the self-assembled growth of a regular 3D Ge quantum dot (QD) structure in an amorphous Al2O3 matrix during the ion beam sputter deposition of a periodic Ge/Al2O3 multilayer on silicon is reported. A 573 K substrate temperature proved to be necessary to achieve the self-assembly effect. Relying on a fast repeated acquisition of GISAXS patterns, the temporal evolution of the growing 3D Ge QD structure was analyzed bilayer by bilayer to determine its type, lateral and vertical correlation lengths, and inter-QD distance. The QD structure was found to have body-centered tetragonal lattice type with ABA stacking, with the lattice parameters refined by fitting the final GISAXS pattern relying on a paracrystal model. A single set of paracrystal parameters enables one to simulate the temporal evolution of the in situ GISAXS patterns throughout the deposition process, suggesting that the Ge QD self-assembly is driven from the very beginning solely by the growing surface morphology. Ex situ GISAXS and X-ray reflectivity measurements along with a cross-section high-resolution transmission electron microscopy analysis complete the study.

Dynamics of InAs Quantum Dots Formation on AlAs and GaAs

2000 ◽  
Vol 648 ◽  
Author(s):  
M. Yakimov ◽  
V. Tokranov ◽  
S. Oktyabrsky
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Single Layer ◽  
High Energy ◽  
Ex Situ ◽  
Inas Quantum Dots ◽  
Force Microscopy ◽  
Atomic Force ◽  
Kinetics Of

AbstractWe have studied the formation of InAs quantum dots (QDs) grown by molecular beam epitaxy on top of GaAs and 2 ML-thick AlAs layers in the temperature range from 350 to 500°C. In-situ reflection high energy electron diffraction (RHEED) patterns were recorded in real time during the growth and analyzed to characterize the 2D-to-3D transition on the surface, including QD formation, and ripening process. The kinetics of QD formation was studied using the InAs growth rates ranging from 0.01 to 1 ML/s and different ratios of As2/In fluxes. RHEED patterns and ex-situ atomic force microscopy images were analyzed to reveal the development of sizes and shapes of the single-layer and stacked QD ensembles. The critical InAs coverage for QD formation was shown to be consistently higher for dots grown on the AlAs overlayer than for those grown on GaAs surface. Self-assembly of multilayer QD stacks revealed the reduction of the critical thickness for dots formed in the upper layers.

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