Publications de Klara Hernadi | EPFL Graph Search

Electron Microscopy Investigation of Coated Multiwall Carbon Nanotubes Prepared by Reactive Ball Milling

László Forró, Jin Won Seo, Klara Hernadi, Endre Horvath

Homogeneous and stable inorganic coating of SiO2, Al2O3 and TiO2 was obtained on the surface of multiwall carbon nanotubes (MWNTs) by mechanically mixing them with precursor compounds in a planetary ball mill and by subsequent hydrolysis. Detailed studies ...

AMER SCIENTIFIC PUBLISHERS2019

Growth of CNT Forests on Titanium Based Layers, Detailed Study of Catalysts

László Forró, Klara Hernadi, Endre Horvath, Pavao Roko Andricevic

For better electrical contacts of potential devices, growth of vertically aligned carbon nanotubes (CNT forests) directly onto conductive substrates is an emerging challenge. Here, we report a systematic study on the CCVD synthesis of carbon nanotube fores ...

FRONTIERS MEDIA SA2018

Three-Dimensionally Enlarged Photoelectrodes by a Protogenetic Inclusion of Vertically Aligned Carbon Nanotubes into CH3NH3PbBr3 Single Crystals

László Forró, Andrzej Sienkiewicz, Bálint Náfrádi, Klara Hernadi, Endre Horvath, Xavier François Mettan, Pavao Roko Andricevic, Márton Kollár

We demonstrate that single crystals of methylammonium lead bromide (MAPbBr(3)) could be grown directly on vertically aligned carbon nanotube (VACNT) forests. The fast-growing MAPbBr3 single crystals engulfed the protogenetic inclusions in the form of indiv ...

2017

Influence of TiO2 phase composition on the photocatalytic activity of TiO2/MWCNT composites prepared by combined sol-gel/hydrothermal method

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Titanium dioxide/multiwall carbon nanotube (TiO2/MWCNT) composites were prepared by sol-gel method with hydrolysis of titanium alkoxide precursor followed by crystallization via hydrothermal treatment at different acid concentrations. Transmission electron ...

Elsevier Science Bv2016

Generating photocurrent by nanocomposites based on photosynthetic reaction centre protein

László Forró, Klara Hernadi, Endre Horvath, Emil Nyerki

An optoelectronic device, which converts light energy to electric potential, was designed and fabricated by using photosynthetic reaction centre (RC) proteins of purple bacterium Rhodobacter sphaeroides R-26, based on the structure and function of the dye ...

Wiley-V C H Verlag Gmbh2015

Challenges and Rewards of the Electrosynthesis of Macroscopic Aligned Carbon Nanotube Array/Conducting Polymer Hybrid Assemblies

László Forró, Klara Hernadi, Endre Horvath, Andrea Pisoni, Péter Krisztián Matus

Hybrid assemblies based on conducting polymers and carbon nanomaterials with organized nanoscale structure are excellent candidates for various application schemes ranging from thermal management to electrochemical energy conversion and storage. In the cas ...

Wiley-Blackwell2015

Equilibrium concentration of singlet oxygen in photoreaction of reaction center/carbon nanotube bionanocomposites

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

The reaction center protein is the unit in the photosynthetic organisms in which the primary events of the photoelectric energy conversion take place during photosynthesis. When the photochemistry following the excitation of the reaction center by light is ...

Wiley-V C H Verlag Gmbh2015

Preparation of titania covered multi-walled carbon nanotube thin films

László Forró, Arnaud Magrez, Klara Hernadi, 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

The ethanol sensors made from alpha-Fe2O3 decorated with multiwall carbon nanotubes

László Forró, Klara Hernadi

Thin film ethanol sensors made from alpha-Fe2O3 decorated with multiwall carbon nanotubes (MWCNTs) were manufactured by the electron beam deposition method. The morphology of the decorated alpha-Fe2O3/MWCNTs (25:1 weight ratios) nanocomposite powder was in ...

Techno-Press2015

The effect of titania precursor on the morphology of prepared TiO2/MWCNT nanocomposite materials

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Since materials science is of great importance, the application of composite materials based on carbon nanotubes (CNTs) is widely investigated. Current work is aimed at preparing nanocomposites of TiO2/MWCNT using an impregnation method combined with slow ...

Wiley-V C H Verlag Gmbh2014

Chemical challenges during the synthesis of MWCNT-based inorganic nanocomposite materials

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Multiwalled carbon nanotubes (MWCNTs) were successfully covered with metal oxides - such as TiO2, ZnO, Al2O3, SnO2, and In2O3 nanoparticles - with different preparation methods under solvent conditions. The applied synthesis techniques were impregnation, a ...

Wiley-V C H Verlag Gmbh2014

Photosynthetic reaction centre/carbon nanotube bundle composites

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Since their discovery, carbon nanotubes (CNTs) have attracted intense attention to broad range of potential applications. In contrast to the 1D isolated single-walled carbon nanotubes (SWCNT), 2D films or bundles made of thousands of tubes have been introd ...

Wiley-V C H Verlag Gmbh2014

Highly efficient bacteria inactivation and phenol degradation by visible light irradiated iodine doped TiO2

László Forró, Andrzej Sienkiewicz, Klara Hernadi

In this study visible light active iodine doped titanium dioxide samples prepared by sol-gel method were investigated. Photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence spectroscopy (XF ...

Elsevier Science Bv2013

Carbon nanotubes quench singlet oxygen generated by photosynthetic reaction centers

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath, Krisztina Nagy

Photosensitizers may convert molecular oxygen into reactive oxygen species (ROS) including, e.g., singlet oxygen (O-1(2)), superoxide anion (O-2(-center dot)), and hydroxyl radicals ((OH)-O-center dot), chemicals with extremely high cyto- and potential gen ...

Wiley-V C H Verlag Gmbh2013

Preparation and characterization of multiwalled carbon nanotube/In2O3 composites

László Forró, Arnaud Magrez, Klara Hernadi

We have prepared multiwalled carbon nanotube (MWCNT)/In2O3 composites using a simple impregnation method. The precursor compound indium(III) chloride (InCl3) was used to cover the surface of MWCNTs and distilled water was used as solvent. The applied mass ...

Pergamon-Elsevier Science Ltd2013

Comparison of the photocatalytic efficiencies of bare and doped rutile and anatase TiO2 photocatalysts under visible light for phenol degradation and E. coli inactivation

László Forró, Andrzej Sienkiewicz, Klara Hernadi

This study aimed at comparing the photocatalytic efficiencies of various TiO2 based photocatalysts for phenol degradation and bacteria inactivation under illumination with visible light. Commercial undoped anatase and rutile (both from Aldrich), Aeroxide P ...

Elsevier Science Bv2013

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

Gas sensors made of multiwall carbon nanotubes modified by tin dioxide

László Forró, Klara Hernadi

Thin film gas sensors made of nanocomposite MWCNT center dot SnO2(1:66), semiconductor compound WO3 center dot SnO2(1:9), and also multicomponent structure MWCNT center dot SnO2(1:66)/WO3 center dot SnO2(1:9) have been fabricated by high-frequency magnetro ...

Allerton Press Inc2013

Carbon nanotube as functional matrix for bacterial photosynthetic reaction centers

László Forró, Arnaud Magrez, Klara Hernadi, Endre Horvath

Springer2013