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Arnaud Magrez

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Related publications (188)

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

From nanotubes to single crystals: Co doped TiO2

Helmuth Berger, László Forró, Richard Gaal, Arnaud Magrez, Bálint Náfrádi, Neda Nikseresht Ghanepour, Jacim Jacimovic, Endre Horvath

Millimeter-sized cobalt doped rutile crystals with a bi-pyramidal shape are obtained by chemical vapour transport using scroll-type H2Ti3O7 nanotubes as a precursor in which Co2+ ions are introduced by a simple ion exchange method prior to the growth. Desp ...

Amer Inst Physics2013

Direct growth of nanotubes and graphene nanoflowers on electrochemical platinum electrodes

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

Multi-walled carbon nanotubes and graphene nanoflowers were grown by a catalytic chemical vapor deposition process on metal surfaces. Electrodeposition was used as a versatile technique to obtain three different iron catalyst coatings on platinum microelec ...

2013

Electrical property measurements of Cr-N codoped TiO2 epitaxial thin films grown by pulsed laser deposition

László Forró, Richard Gaal, Arnaud Magrez, Jacim Jacimovic

The temperature dependent resistivity and thermo-electric power of Cr-N codoped TiO2 were compared with that of single element N and Cr doped and undoped TiO2 using epitaxial anatase thin films grown by pulsed laser deposition on (100) LaAlO3 substrates. T ...

AIP American Institute of Physics2013

Study of the surface-ruthenated SnO2/MWCNTs nanocomposite thick-film gas sensors

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Multi-walled carbon nanotubes (MWCNTs) were successfully coated with tin-dioxide (SnO2) nanopartides using both hydrothermal process and sol-gel technique under different solvent conditions. The obtained MWCNTs/SnO2 nanocomposites had the weight ratio of t ...

Elsevier Science Sa2013

Sensing hydrogen peroxide by carbon nanotube/horseradish peroxidase bio-nanocomposite

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

H2O2 is a product of reactions catalysed by several oxidase enzymes and it is essential in environmental and pharmaceutical analyses. The most commonly used enzyme in understanding the biological behaviour of catalysed oxidation of H2O2 is horseradish pero ...

Wiley-V C H Verlag Gmbh2013

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

Low temperature resistivity, thermoelectricity, and power factor of Nb doped anatase TiO2

László Forró, Richard Gaal, Arnaud Magrez, Jacim Jacimovic

The resistivity of a very high quality anatase TiO2 doped with 6% of Nb was measured from 300K down to 40 mK. No sign of superconductivity was detected. Instead, a minute quantity of cation vacancies resulted in a Kondo scattering. Measurements of thermo-e ...

Amer Inst Physics2013

Dye metachromasy on titanate nanowires: sensing humidity with reversible molecular dimerization

László Forró, Arnaud Magrez, Primoz Rebernik Ribic, Endre Horvath

We report on the reversible dimerization of methylene blue (MB) on titanate nanowires. The self-organizational properties of MB on the surface of this nanostructured material studied by spectroscopic means revealed that the light absorption properties of t ...

Royal Society of Chemistry2012

Growth of carbon nanotubes on carbon fibers without strength degradation

László Forró, Jin Won Seo, Arnaud Magrez

Carbon nanotubes (CNTs) are grown on PAN-based carbon fibers by means of catalytic chemical vapor deposition technique. By using catalytic thermal decomposition of hydrocarbon, CNTs can be grown in the temperature range of 650750 degrees C. However, carbon ...

Wiley-V C H Verlag Gmbh2012

Carbon nanotubes-SU8 composite for flexible conductive inkjet printable applications

László Forró, Richard Gaal, Jürgen Brugger, Arnaud Magrez, 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

Defects and localization in chemically-derived graphene

László Forró, Andrzej Sienkiewicz, Richard Gaal, Arnaud Magrez, Luka Ciric, Jacim Jacimovic, George Cristian Vaju

We have performed electron spin resonance (ESR) measurements on a large assembly of graphene oxide (GO) and reduced graphene oxide (RGO) flakes. In GO samples the Curie tail is coming from 1.4 x 10(18) cm(-3) of localized spins. Although reduction of GO wa ...

Amer Physical Soc2012

Charge stabilization by reaction center protein immobilized to carbon nanotubes functionalized by amine groups and poly(3-thiophene acetic acid) conducting polymer

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

A large number of studies have indicated recently that photosynthetic reaction center proteins (RC) bind successfully to nanostructures and their functional activity is largely retained. The major goal of current research is to find the most efficient syst ...

Wiley-V C H Verlag Gmbh2012

Photocatalytic and phototoxic properties of TiO2-based nanofilaments: ESR and AFM assays

László Forró, Andrzej Kulik, Andrzej Sienkiewicz, Arnaud Magrez, Katarzyna Pierzchala

There is uncertainty in understanding of the relationship between physico-chemical parameters of nanosized titanium dioxide (nano-TiO2) and its toxicity when brought into contact with living cells. This study provides a multidisciplinary experimental insig ...

Informa Healthcare2012

Magnetism in nanoscale graphite flakes as seen via electron spin resonance

László Forró, Andrzej Sienkiewicz, Zeljko Sljivancanin, Arnaud Magrez, Luka Ciric, Jacim Jacimovic

Magnetic properties of a large assembly of ultrathin graphitic particles obtained by heavy sonication of graphite powder dispersed in N-methylpyrrolidone were measured by electron-spin resonance (ESR). The ESR signal was decomposed into one narrow and one ...

American Physical Society2012

Manufacturing and investigations of i-butane sensor made of SnO2/multiwall-carbon-nanotube nanocomposite

László Forró, Arnaud Magrez, Klara Hernadi

Nanocomposite SnO2/multiwall-carbon-nanotubes were prepared by the sol-gel method. The morphology of prepared nanocomposite powder was investigated by scanning electron microscopy. Energy-dispersive X-ray and X-ray diffraction analyses were carried out, th ...

Elsevier Science Sa2012

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

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

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

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

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