scholarly journals Mechanical, Electrical, and Crystallographic Property Dynamics of Bent and Strained Ge/Si Core–Shell Nanowires As Revealed by in situ Transmission Electron Microscopy

Nano Letters ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 7238-7246 ◽  
Author(s):  
Chao Zhang ◽  
Dmitry G. Kvashnin ◽  
Laure Bourgeois ◽  
Joseph F. S. Fernando ◽  
Konstantin Firestein ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Core Shell ◽  
Transmission Electron ◽  
Crystallographic Property ◽  
Shell Nanowires

Plan-view transmission electron microscopy investigation of GaAs/(In,Ga)As core-shell nanowires

2014 ◽  
Vol 105 (12) ◽  
pp. 121602 ◽  
Author(s):  
Javier Grandal ◽  
Mingjian Wu ◽  
Xiang Kong ◽  
Michael Hanke ◽  
Emmanouil Dimakis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Core Shell ◽  
Transmission Electron Microscopy Investigation ◽  
Plan View ◽  
Transmission Electron ◽  
Microscopy Investigation ◽  
Electron Microscopy Investigation ◽  
Shell Nanowires

scholarly journals Bi Incorporation and Segregation in the MBE-Grown GaAs-(Ga,Al)As-Ga(As,Bi) Core-Shell Nanowires

2021 ◽  
Author(s):  
Janusz Sadowski ◽  
Anna Kaleta ◽  
Serhii Kryvyi ◽  
Dorota Janaszko ◽  
Bogusława Kurowska ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Molecular Beam ◽  
Flux Ratio ◽  
Growth Conditions ◽  
Nanowire Growth ◽  
Core Shell ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Shell Nanowires

Abstract Incorporation of Bi into GaAs-(Ga,Al)As-Ga(As,Bi) core-shell nanowires grown by molecular beam epitaxy is studied with transmission electron microscopy. Nanowires are grown on GaAs(100) substrates with Au-droplet assisted mode. Bi-doped shells are grown at low temperature (300 °C) with a close to stoichiometric Ga/As flux ratio. At low Bi fluxes, the Ga(As,Bi) shells are smooth, with Bi completely incorporated into the shells. Higher Bi fluxes (Bi/As flux ratio ~ 4%) led to partial segregation of Bi as droplets on the nanowires sidewalls, preferentially located at the nanowire segments with wurtzite structure. We demonstrate that such Bi droplets on the sidewalls act as catalysts for the growth of branches perpendicular to the GaAs trunks. Due to the tunability between zinc-blende and wurtzite polytypes by changing the nanowire growth conditions, this effect enables fabrication of branched nanowire architectures with branches generated from selected (wurtzite) nanowire segments.

Unveiling hidden epitaxial interfaces in novel SnO2/Zn2SnO4 core–shell nanowires with a multi-domain shield via cross-sectional transmission electron microscopy

CrystEngComm ◽  
2019 ◽  
Vol 21 (12) ◽  
pp. 1895-1902 ◽  
Author(s):  
Bojia Xu ◽  
Baobao Cao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Core Shell ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Shell Nanowires

Hidden epitaxial interfaces were revealed via cross-sectional TEM study of novel quasi-hexagonal SnO2/Zn2SnO4 core–shell nanowires.

Fabrication of Gold Nanotubes from Removable MgO Nanowires Templates

2008 ◽  
Vol 8 (11) ◽  
pp. 5715-5719 ◽  
Author(s):  
Hyoun Woo Kim ◽  
Jong Woo Lee ◽  
Mesfin A. Kebede ◽  
Hyo Sung Kim ◽  
Buddhudu Srinivasa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Metallic Structures ◽  
X Ray ◽  
Transmission Electron ◽  
Shell Nanowires ◽  
Scanning Electron

We have prepared MgO/Au core–shell nanowires, subsequently demonstrating the fabrication of Au nanotubes by using MgO nanowires as a sacrificial template. The samples were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. MgO nanowires were coated with a conformal layer of Au via sputtering. By etching away the MgO core in aqueous (NH3)2SO4 solution, hollow nanotube-like structures of Au were readily obtained. This approach offers a potentially useful route for the fabrication of a variety of hollow metallic structures.

MnS@N,S Co‐Doped Carbon Core/Shell Nanocubes: Sulfur‐Bridged Bonds Enhanced Na‐Storage Properties Revealed by In Situ Raman Spectroscopy and Transmission Electron Microscopy

Small ◽  
2020 ◽  
Vol 16 (45) ◽  
pp. 2003001
Author(s):  
Jinliang Zhu ◽  
Pengcheng Wei ◽  
Qingkai Zeng ◽  
Guifang Wang ◽  
Kaipeng Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Core Shell ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Transmission Electron ◽  
Carbon Core ◽  
Storage Properties ◽  
Co Doped

Transmission Electron Microscopy in situ Fabrication of ZnO/Al2O3Composite Nanotubes by Electron-Beam-Irradiation-Induced Local Etching of ZnO/Al2O3Core/Shell Nanowires

Small ◽  
2008 ◽  
Vol 4 (12) ◽  
pp. 2112-2117 ◽  
Author(s):  
Yang Yang ◽  
Roland Scholz ◽  
Andreas Berger ◽  
Dong Sik Kim ◽  
Mato Knez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
In Situ Fabrication ◽  
Transmission Electron ◽  
Shell Nanowires

scholarly journals Stability of a Bifunctional Cu-Based Core@Zeolite Shell Catalyst for Dimethyl Ether Synthesis Under Redox Conditions Studied by Environmental Transmission Electron Microscopy andIn SituX-Ray Ptychography

2017 ◽  
Vol 23 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Sina Baier ◽  
Christian D. Damsgaard ◽  
Michael Klumpp ◽  
Juliane Reinhardt ◽  
Thomas Sheppard ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Dimethyl Ether ◽  
Core Shell ◽  
X Ray ◽  
Environmental Transmission ◽  
The Core ◽  
Transmission Electron ◽  
The Stability

AbstractWhen using bifunctional core@shell catalysts, the stability of both the shell and core–shell interface is crucial for catalytic applications. In the present study, we elucidate the stability of a CuO/ZnO/Al2O3@ZSM-5 core@shell material, used for one-stage synthesis of dimethyl ether from synthesis gas. The catalyst stability was studied in a hierarchical manner by complementary environmental transmission electron microscopy (ETEM), scanning electron microscopy (SEM) andin situhard X-ray ptychography with a specially designedin situcell. Both reductive activation and reoxidation were applied. The core–shell interface was found to be stable during reducing and oxidizing treatment at 250°C as observed by ETEM andin situX-ray ptychography, although strong changes occurred in the core on a 10 nm scale due to the reduction of copper oxide to metallic copper particles. At 350°C,in situX-ray ptychography indicated the occurrence of structural changes also on theµm scale, i.e. the core material and parts of the shell undergo restructuring. Nevertheless, the crucial core–shell interface required for full bifunctionality appeared to remain stable. This study demonstrates the potential of these correlativein situmicroscopy techniques for hierarchically designed catalysts.

Effects of VLS and VS mechanisms during shell growth in GaAs-AlGaAs core-shell nanowires investigated by transmission electron microscopy

2017 ◽  
Vol 65 ◽  
pp. 108-112 ◽  
Author(s):  
Mario Scuderi ◽  
Paola Prete ◽  
Nico Lovergine ◽  
Corrado Spinella ◽  
Giuseppe Nicotra
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shell Growth ◽  
Core Shell ◽  
Transmission Electron ◽  
Shell Nanowires
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