Home

Person

Arnaud Magrez

About
Privacy
Disclaimer

Graph Chatbot

Related publications (185)

Page 4 of 10

Influence of the catalyst drying process and catalyst support particle size on the carbon nanotubes produced by CCVD

László Forró, Arnaud Magrez, Marijana Mionic Ebersold

Catalytic Chemical Vapour Deposition (CCVD) is considered as the most suitable technique for the large scale and low-cost production of multiwalled carbon nanotubes. We have studied the effect of the preparation process, and of the support particle size on ...

2008

Temperature-induced Phase Transitions in Micro-, Submicro-, and Nanocrystalline NaNbO3

Arnaud Magrez

Phase transitions in micro-, submicro-, and nanocrystalline NaNbO3 were investigated by temperature-tuning Raman spectroscopy and X-ray powder diffraction method. Three powders with different average particle size showed successive phase transitions within ...

2007

Enhanced low-temperature thermoelectrical properties of BiTeCl grown by topotactic method

Helmuth Berger, László Forró, Arnaud Magrez, Richard Gaal, Philippe Bugnon, Ana Akrap, Jacim Jacimovic, Sergiy Katrych, Andrea Pisoni, Xavier François Mettan

We developed a topotactic strategy to grow BiTeCl single crystals. Structural characterization by means of X-ray diffraction was performed, and the high crystallinity of the material was proven. Measurements of the thermoelectrical coefficients electrical ...

Pergamon-Elsevier Science Ltd2014

Melting of a skyrmion lattice to a skyrmion liquid via a hexatic phase

Henrik Moodysson Rønnow, Arnaud Magrez, Fabrizio Carbone, Marco Cantoni, Ping Huang, Thomas Schönenberger

While in 3D materials melting is a single, first-order phase transition, in 2D systems, it can also proceed via an intermediate phase. For a skyrmion lattice in Cu2OSeO3, magnetic field variations can tune this quasiparticle 2D solid into a skyrmion liquid ...

Nature Publishing Group2020

Pressure dependence of the large-polaron transport in anatase TiO2 single crystals

Radomir Zikic, László Forró, Helmuth Berger, Arnaud Magrez, Richard Gaal, Jacim Jacimovic, George Cristian Vaju

We have measured the pressure and temperature dependences of the resistivity and the thermoelectric power of anatase, TiO2. The resistivity varies with T-3 at high temperatures, and its absolute value is in the 1 Omega cm range. Below 60 K, the resistivity ...

IOP Publishing - EPL Association2012

Carbon nanotubes-SU8 composite for flexible conductive inkjet printable applications

Jürgen Brugger, László Forró, Arnaud Magrez, Richard Gaal, Kristopher Pataky, Marijana Mionic Ebersold

We have developed a conducting composite based on multi-walled carbon nanotubes and bisphenol A novolak epoxy resin (SU8) for inkjet printing purposes. We could deposit regular conducting stripes and arrays of 150 mu m spots on glass and on flexible polyet ...

Royal Society of Chemistry2012

Graphene Negative Differential Resistance Circuit With Voltage-Tunable High Performance at Room Temperature

Mihai Adrian Ionescu, Arnaud Magrez, Antonios Bazigos, Laurent Syavoch Bernard, Pankaj Sharma

We propose, fabricate, and experimentally demonstrate a circuit based on graphene field-effect transistors (GFETs) showing enhanced negative differential resistance (NDR) characteristics at room temperature. The proposed graphene NDR (GNDR) circuit consist ...

Institute of Electrical and Electronics Engineers2015

Evidence for a Strong Topological Insulator Phase in ZrTe5

Helmuth Berger, Arnaud Magrez, Oleg Yazyev, Philippe Bugnon, Alberto Crepaldi, Gabriel Albert Autes, Luca Gragnaniello

The complex electronic properties of ZrTe5 have recently stimulated in-depth investigations that assigned this material to either a topological insulator or a 3D Dirac semimetal phase. Here we report a comprehensive experimental and theoretical study of bo ...

Amer Physical Soc2016

Preparation of titania covered multi-walled carbon nanotube thin films

László Forró, Arnaud Magrez, Endre Horvath

The aim of this work was to investigate the effects of relative humidity on the formation of titania layers on the surface of multi-walled carbon nanotubes under regulated conditions in a sealed system. Reactive precursor compounds such as titanium (IV) ox ...

Elsevier Sci Ltd2015

Electronic Phase Separation and Dramatic Inverse Band Renormalization in the Mixed-Valence Cuprate LiCu2O2

Helmuth Berger, Arnaud Magrez, Marco Grioni, Philippe Bugnon, Luca Moreschini, Simon Karl Moser, Gianmarco Gatti

We measured, by angle-resolved photoemission spectroscopy, the electronic structure of LiCu2O2, a mixed-valence cuprate where planes of Cu(I) (3d(10)) ions are sandwiched between layers containing one-dimensional edge-sharing Cu(II) (3d(9)) chains. We find ...

Amer Physical Soc2017

Catalytically grown carbon nanotubes: from synthesis to toxicity

Vladimir Lukovac, László Forró, Arnaud Magrez, Jin Won Seo, Kyumin Lee, Mirko Milas

Catalytic chemical vapour deposition (CCVD) is currently the most promising technique to produce carbon nanotubes (CNTs) on a specific site as well as on a large-scale. Here, we review our recent experimental studies on CNTs grown by CCVD. The yield as wel ...

2007

Diameter-Dependent Elastic Modulus Supports the Metastable-Catalyst Growth of Carbon Nanotubes

László Forró, Arnaud Magrez, Andrzej Kulik, Jin Won Seo, Kyumin Lee, Branimir Lukic

We measured the elastic modulus of individual multiwalled carbon nanotubes (MWCNTs) grown by catalytic chemical vapor deposition (CVD) over a broad diameter range (10-25 nm). Alternating current (ac) dielectrophoresis was used for efficient tube deposition ...

American Chemical Society (ACS)2007

Efficient voltammetric discrimination of free bilirubin from uric acid and ascorbic acid by a CVD nanographite-based microelectrode

Giovanni De Micheli, László Forró, Sandro Carrara, Arnaud Magrez, Irene Taurino

We report a novel electrochemical sensor based on nanographite grown on platinum microelectrodes for the determination of bilirubin in the presence of normal concentrations of albumin. The albumin is a protein with an intrinsic ability to bind the bilirubi ...

Elsevier Science Bv2014

Single-walled carbon nanotubes functionalized with polydiphenylamine as active materials for applications in the supercapacitors field

Arnaud Magrez

Composites based on polydiphenylamine (PDPA) doped with heteropolyanions of H3PW12O40 and single-walled carbon nanotubes (SWNTs) were prepared by electrochemical polymerization of diphenylamine (DPA) on carbon nanotube films deposited onto Pt electrodes. H ...

Elsevier Science Sa2013

Hydrogen storage properties of as-synthesized and severely deformed magnesium - multiwall carbon nanotubes composite

Arnaud Magrez

We prepared a Mg-2 mass % multiwall carbon nanotubes composite employing a powder metallurgy technique. The kinetics of hydrogen absorption/desorption of the as-synthesized composite was much faster than that of reference samples of pure Mg. The pressure-c ...

2010

Growth of single-crystalline KNbO3 nanostructures

László Forró, Nava Setter, Arnaud Magrez, Jin Won Seo

This communication reports on the growth of highly uniform KNbO3 nanowires exhibiting a narrow diameter distribution around 60 nm and a length-to-width ratio up to 100. The nanowires were prepared by a hydrothermal route, which enables simple, gram-scale p ...

2006

High-pressure study of anatase TiO2

László Forró, Helmuth Berger, Arnaud Magrez, Richard Gaal, Jacim Jacimovic, George Cristian Vaju

We report resistivity and thermo-electric power measurements of the anatase phase of TiO2 under pressure up to 2.3 GPa. Despite its transparent appearance, the single crystal of anatase exhibits a metallic-like resistivity above 60 K, at all pressures. The ...

2010

Electron Glass Phase with Resilient Zhang-Rice Singlets in LiCu3O3

Rosario Scopelliti, László Forró, Henrik Moodysson Rønnow, Arnaud Magrez, Simon Karl Moser, Edoardo Martino, Krunoslav Prsa, Paul Gregory Freeman, Gianmarco Gatti, Jens Christian Johannsen

LiCu3O3 is an antiferromagnetic mixed valence cuprate where trilayers of edge -sharing Cu(II)O (3d9) are sandwiched in between planes of Cu(I) (3d10) ions, with Li stochastically substituting Cu(II). Angle resolved photoemission spectroscopy (ARPES) and de ...

Amer Physical Soc2024

FeOx magnetization enhancing E-coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

César Pulgarin, Juan Kiwi, Arnaud Magrez, Sami Rtimi, Ivica Zivkovic, Stefanos Giannakis

Drastic bacterial enhancement was observed when the Ag(3%)-TiO2 nanotubes were modified with FeOx (3%) magnetic oxide. On bare TiO2- nanotubes a reduction of 0.21og(10)CFU was observed within one hour under simulated low intensity solar light. Under simila ...

Elsevier2017

MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO

Henrik Moodysson Rønnow, Arnaud Magrez, Diane Virginie Marie Lançon, Ping Huang

We show that the observed ferromagnetic behavior of ZnO lightly doped with Mn coincides with the presence of MnO nanoparticles, whereas cluster-free Mn doped ZnO behaves paramagnetically. This conclusion is reached by a study of the structural and magnetic ...

2016