| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Mkhoyan, K. Andre
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2023Optical Properties of Electrochemically Gated La 1− xSr xCoO 3−δ as a Topotactic Phase-Change Materialcitations
- 2023Anomalous strain relaxation and its impact on the valence-driven spin-state/metal-insulator transition in epitaxial (Pr1−yYy)1−xCaxCoO3−δcitations
- 2023Spin Hall conductivity in Bi$_{1-x}$Sb$_x$ as an experimental test of bulk-boundary correspondence
- 2021Spin and Charge Interconversion in Dirac-Semimetal Thin Filmscitations
- 2020Layer Dependence of Dielectric Response and Water-Enhanced Ambient Degradation of Highly Anisotropic Black Ascitations
- 2020Ambipolar transport in van der Waals black arsenic field effect transistorscitations
- 2020Plasmonic nanocomposites of zinc oxide and titanium nitridecitations
- 2020Self-Assembled Periodic Nanostructures Using Martensitic Phase Transformationscitations
- 2020Thermal transport in ZnO nanocrystal networks synthesized by nonthermal plasmacitations
- 2018Room-temperature high spin–orbit torque due to quantum confinement in sputtered BixSe(1–x) filmscitations
- 2015Giant Spin Pumping and Inverse Spin Hall Effect in the Presence of Surface and Bulk Spin-Orbit Coupling of Topological Insulator Bi2Se3citations
- 2015Nonequilibrium-Plasma-Synthesized ZnO Nanocrystals with Plasmon Resonance Tunable via Al Doping and Quantum Confinementcitations
- 2015Hybrid molecular beam epitaxy for the growth of stoichiometric BaSnO3citations
- 2012Sputter deposition of semicrystalline tin dioxide filmscitations
- 2012Improving the damp-heat stability of copper indium gallium diselenide solar cells with a semicrystalline tin dioxide overlayercitations
- 2010Orientation and morphological evolution of catalyst nanoparticles during carbon nanotube growthcitations
- 2010Effect of hydrogen on catalyst nanoparticles in carbon nanotube growthcitations
Places of action
| Organizations | Location | People |
|---|
article
Effect of hydrogen on catalyst nanoparticles in carbon nanotube growth
Abstract
<p>The structures of carbon nanotubes grown from catalytic nanoparticles via plasma-enhanced chemical vapor deposition in CH<sub>4</sub> / H<sub>2</sub> mixtures show a strong dependence on the H<sub>2</sub> -to- CH<sub>4</sub> ratio in the feed gas. A suite of characterization techniques, including optical emission, infrared, and Raman spectroscopies combined with convergent-beam and selected-area electron diffraction, and high-resolution (scanning) transmission electron microscopy imaging were used to systematically investigate the interrelation among plasma gas phase composition, catalysts morphology, catalyst structure, and carbon nanotube structure. Hydrogen plays a critical role in determining the final carbon nanotube structure through its effect on the catalyst crystal structure and morphology. At low H<sub>2</sub> -to- CH <sub>4</sub> ratios (∼1), iron catalyst nanoparticles are converted to Fe<sub>3</sub> C and well-graphitized nanotubes grow from elongated Fe <sub>3</sub> C crystals. High (>5) H<sub>2</sub> -to- CH<sub>4</sub> ratios in the feed gas result in high hydrogen concentrations in the plasma and strongly reducing conditions, which prevents conversion of Fe to Fe<sub>3</sub> C. In the latter case, poorly-graphitized nanofibers grow from ductile bcc iron nanocrystals that are easily deformed into tapered nanocrystals that yield nanotubes with thick walls.</p>