Publications de Rita Smajda | EPFL Graph Search

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

László Forró, Kurt Schenk, Arnaud Magrez, Bálint Náfrádi, Zlatko Mickovic, Rita Smajda, Endre Horvath, Péter Szirmai

We report a novel synthesis route of homogeneously manganese-doped TiO2 nanotubes in a broad concentration range. The scroll-type trititanate (H2Ti3O7) nanotubes prepared by hydrothermal synthesis were used as precursors. Mn2+ ions were introduced by an io ...

Amer Chemical Soc2013

Reinforcement of CVD grown multi-walled carbon nanotubes by high temperature annealing

László Forró, Arnaud Magrez, Rita Smajda, Massimo Spina

We report on the increase of the Young's modulus (E) of chemical vapor deposition (CVD) grown multi-walled carbon nanotubes (MWNTs) upon high temperature heat treatment. The post heat-treatment at 2200-2800 degrees C in a controlled atmosphere results in a ...

Amer Inst Physics2013

Tuning the length dispersion of multi-walled carbon nanotubes by ball milling

László Forró, Claudio Grimaldi, Richard Gaal, Arnaud Magrez, Marijana Mionic Ebersold, Rita Smajda, Primoz Rebernik Ribic

The statistical analysis of the length distribution of catalytic chemical vapour deposition synthesized multi-walled carbon nanotubes cut by planetary ball milling is reported. The nanotube lengths follow a log-normal distribution in a broad range of grind ...

Amer Inst Physics2013

Long-term colloidal stability of 10 carbon nanotube types in the absence/presence of humic acid and calcium

Laura Sigg, Arnaud Magrez, Rita Smajda

The colloidal stabilities of ten carbon nanotubes (CNTs) having varying physico-chemical properties were compared in long-term experiments. The presence of Suwannee River Humic Acid (SRHA) increased the fraction of CNTs in the supernatants (4-88% for the v ...

Elsevier Sci Ltd2012

Striking Influence of the Catalyst Support and Its Acid–Base Properties: New Insight into the Growth Mechanism of Carbon Nanotubes

Gabor Laurenczy, Jin Won Seo, Arnaud Magrez, Donatello Acquaviva, Juan Carlos Andresen, Rita Smajda, Endre Horvath

In the accepted mechanisms of carbon nanotube (CNT) growth by catalytic chemical vapor deposition (CCVD), the catalyst support is falsely considered as a passive material whose only role is to prevent catalytic particles from coarsening. The chemical chang ...

2011

Electrical properties and applications of carbon based nanocomposite materials: An overview

Rosendo Sanjines, Arnaud Magrez, Marijana Mionic Ebersold, Rita Smajda

The allotropic forms of carbon (amorphous and polycrystalline graphite, carbon black, fullerenes, nanotubes, graphene) exhibit a large variety of charge transport properties which have been stimulating fundamental and applied research for the development o ...

2011

In Vitro Investigation of the Cellular Toxicity of Boron Nitride Nanotubes

László Forró, Arnaud Magrez, Lenke Horváth, Rita Smajda, Beat Schwaller, Endre Horvath

Nanotubes present one of the most promising opportunities in nanotechnology with a plethora of applications in nanoelectronics, mechanical engineering, as well as in biomedical technology. Due to their structure and some physical properties, boron nitride ...

American Chemical Society2011

Synthesis, electrical resistivity, thermo-electric power and magnetization of cubic ZnMnO3

László Forró, Andrzej Sienkiewicz, Richard Gaal, Arnaud Magrez, Zlatko Mickovic, Jacim Jacimovic, Rita Smajda, George Cristian Vaju

Cubic ZnMnO3 powder in the form of well-crystalline nanoflakes have been synthesized at low temperatures from a nitrate precursor. The electrical properties of cubic ZuMnO(3) samples have been established by DC resistivity (rho) and thermo-electric power ( ...

Elsevier2011

Reinforcing multiwall carbon nanotubes by electron beam irradiation

László Forró, Jin Won Seo, Arnaud Magrez, Richard Meunier, Martial Duchamp, Marijana Mionic Ebersold, Bo Song, Rita Smajda

We study the effect of electron beam irradiation on the bending modulus of multiwall carbon nanotubes grown by chemical vapor deposition. Atomic force microscopy observations of the nanotube deflection in the suspended-beam geometry suggest an internal, re ...

2010

High-Efficiency Solid-State Dye-Sensitized Solar Cells: Fast Charge Extraction through Self-Assembled 3D Fibrous Network of Crystalline TiO2 Nanowires

László Forró, Michael Graetzel, Shaik Mohammed Zakeeruddin, Arnaud Magrez, Laurent Gabriel Félix Alexandre Stéphane Bungener, Jérémie Minh-Châu Brillet, Nicolas Tétreault, Rita Smajda, Endre Horvath, Thomas Moehl, Peng Wang

Herein, we present a novel morphology for solid-state dye-sensitized solar cells based on the simple and straightforward self-assembly of nanorods into a 3D fibrous network of fused single-crystalline anatase nanowires. This architecture offers a high roug ...

American Chemical Society2010

Capacitive nanoelectromechanical switch based on suspended carbon nanotube array

Didier Bouvet, László Forró, Mihai Adrian Ionescu, Arnaud Magrez, Donatello Acquaviva, Anupama Arun, Rita Smajda

We present the fabrication and high frequency characterization of a capacitive nanoelectromechanical system (NEMS) switch using a dense array of horizontally aligned single-wall carbon nanotubes (CNTs). The nanotubes are directly grown onto metal layers wi ...

American Institute of Physics2010

Low-Temperature, Highly Efficient Growth of Carbon Nanotubes on Functional Materials by an Oxidative Dehydrogenation Reaction

László Forró, Jin Won Seo, Arnaud Magrez, Juan Carlos Andresen, Marijana Mionic Ebersold, Rita Smajda

In many applications like photovoltaics, fuel cells, batteries, or interconnects in integrated circuits carbon nanotubes (CNTs) have the role of charge transport electrodes. The building of such devices requires an in situ growth of CNTs at temperatures wh ...

2010

Lithium niobate nanowires synthesis, optical properties, and manipulation

László Forró, Rachel Grange, Arnaud Magrez, Demetri Psaltis, Jae-Woo Choi, Chia-Lung Hsieh, Rita Smajda, Ye Pu, Ye Pu

Free-standing lithium niobate nanowires (LiNbO3) are synthesized by the hydrothermal route. The polarization response of the second harmonic generation (SHG) signal is measured in a single nanowire and used to identify the crystal orientation by matching w ...

2009

Synthesis and mechanical properties of carbon nanotubes produced by the water assisted CVD process

László Forró, Arnaud Magrez, Richard Meunier, Martial Duchamp, Klara Hernadi, Juan Carlos Andresen, Rita Smajda

Catalyst activity during the carbon nanotubes (CNTs) growth by chemical vapor deposition (CVD) is enhanced when water, a weak oxidizer, is introduced together with the carbon source. The height as well as the CNTs density can be controlled by fine-tuning t ...

2009

Cellular Toxicity of TiO2-Based Nanofilaments

László Forró, Arnaud Magrez, Lenke Horváth, Rita Smajda, Beat Schwaller

At present, nanofilaments are not exclusively based on carbon atoms but can be produced from many inorganic materials in the form of nanotubes and nanowires. It is essential to systematically assess the acute toxicity of these newly synthesized materials s ...

2009