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Bálint Náfrádi

Cette personne a quitté l’EPFL

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Publications associées (79)

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Ultrasensitive 1D field-effect phototransistors: CH3NH3PbI3 nanowire sensitized individual carbon nanotubes

László Forró, Bálint Náfrádi, Endre Horvath, Richard Gaal, Massimo Spina

Field-effect phototransistors were fabricated based on individual carbon nanotubes (CNTs) sensitized by CH3NH3PbI3 nanowires (MAPbI(3)NWs). These devices represent light responsivities of R = 7.7 x 10(5) A W-1 under low-lighting conditions in the nW mm(-2) ...

2016

Tuning of the Thermoelectric Figure of Merit of CH3NH3MI3 (M=Pb,Sn) Photovoltaic Perovskites

László Forró, Davor Pavuna, Endre Horvath, Bálint Náfrádi, Andrea Pisoni, Massimo Spina, Xavier François Mettan, Péter Krisztián Matus

The hybrid halide perovskites, the very performant compounds in photovoltaic applications, possess large Seebeck coefficient and low thermal conductivity, making them potentially interesting high figure of merit (ZT) materials. For this purpose, one needs ...

American Chemical Society2015

Electron spin lifetime in chemically synthesized graphene sheets

László Forró, Bálint Náfrádi

Graphene is theoretically expected to be a highly suitable material for spintronic and quantum computation applications. Current experimental reports assign surprisingly low spin lifetimes to graphene and related carbon structures. Recently, we showed a so ...

Wiley-V C H Verlag Gmbh2014

Towards electron spin resonance of mechanically exfoliated graphene

László Forró, Arnaud Magrez, Andrzej Sienkiewicz, Bálint Náfrádi, Marijana Mionic Ebersold, Luka Ciric

We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathin ...

2009

Optical detection of charge dynamics in CH3NH3PbI3/carbon nanotube composites

László Forró, Bálint Náfrádi, Endre Horvath, Márton Kollár, Pavao Roko Andricevic

We have investigated the optical absorption of metallic and semiconducting carbon nanotubes/CH3NH3PbI3 micro- and nanowire composites. Upon visible light illumination semiconducting carbon nanotube based samples show a photo-induced doping, originating fro ...

2017

A quantum electronic device

Bálint Náfrádi

This disclosure relates to quantum electronic devices for storing qubits. In particular, this disclosure relates to a quantum electronic device comprising a carbon nanosphere adapted to store a qubit represented by an electron spin and a control and readou ...

2017

Spin lifetime of itinerant electrons in chemically synthesized graphene multi-layers

László Forró, Bálint Náfrádi

A chemically synthesized graphitic material where the structural coherence between the layers is missing approximates very well the assembly of graphene sheets. Our multi-frequency (9.4-420 GHz) electron spin resonance (ESR) study clearly identifies itiner ...

Pergamon-Elsevier Science Ltd2014

Influence of the organic cation disorder on photoconductivity in ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4

László Forró, Philip Pattison, Bálint Náfrádi, Alla Arakcheeva, Endre Horvath, Márton Kollár, Pavao Roko Andricevic, Anastasiia Glushkova

We report the synthesis and crystal structure of an organic–inorganic compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron-based single crystal X-ray diffraction experiments revealed that the pristine and thermally treated crystals diffe ...

2018

Frustration-induced one-dimensionality in the isosceles triangular antiferromagnetic lattice of delta-(EDT-TTF-CONMe2)(2)AsF6

László Forró, Bálint Náfrádi

The 1/4-filled organic compound, delta-(EDT-TTF-CONMe2)(2)AsF6 is a frustrated two-dimensional triangular magnetic system as shown by high-frequency (111.2 and 222.4 GHz) electron spin resonance (ESR) and structural data in the literature. The material gra ...

Amer Physical Soc2016

Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-ray Photodetector

László Forró, Bálint Náfrádi, Endre Horvath, Alla Arakcheeva, Márton Kollár, Pavao Roko Andricevic, Anastasiia Glushkova, Veljko Djokic

X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low-photon flux, therefore stimulating the search for novel ...

2021

Tuning ferromagnetism at room temperature by visible light

László Forró, Bálint Náfrádi, Endre Horvath, Massimo Spina, Andrea Pisoni, Péter Szirmai, Xavier François Mettan

Most digital information today is encoded in the magnetization of ferromagnetic domains. The demand for ever-increasing storage space fuels continuous research for energy-efficient manipulation of magnetism at smaller and smaller length scales. Writing a b ...

National Academy of Sciences2020

Spin dynamics in the S=1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br): A multifrequency electron spin resonance study

László Forró, Bálint Náfrádi

We present a multifrequency electron spin resonance study in the range of 4-420 GHz of the quasi-one-dimensional, nondimerized, quarter-filled Mott insulators, delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br). In the high-temperature orthorhombic phase above T simi ...

2010

Supramolecular approach to the synthesis of [60]fullerene-metal dithiocarbamate complexes, {(M-II(R(2)dtc)(2))(x)center dot L}center dot C-60 (M = Zn, Cd, Hg, Fe, and Mn; x=1 and 2). The study of magnetic properties and photoconductivity

László Forró, Bálint Náfrádi

Coordination assemblies formed by metal(II) dithiocarbamates M-II(R(2)dtc)2 (M = Zn, Cd, Hg, Mn, and Fe; R = Me, Et, iPr, nPr, and nBu) and nitrogen-containing ligands (L = DABCO, DMP, and HMTA) are shown to be sterically well consistent with the spherical ...

2008

A Neutral Zwitterionic Molecular Solid

László Forró, Bálint Náfrádi, Balazs Sipos

We report on the acid ethylenedithiotetrathiafulvaleneamidoglycine (EDT-TTF-CO-NH-CH2-CO2H; 1; EDT-TTF=ethylenedithiotetrathiafulvalene) and the 1:1 adduct [(EDT-TTF)(center dot+) -CO-NH-CH2-(CO2H)(-)][(EDT-TTF)-CO-NH-CH2-(CO2H)]center dot CH3OH (2), a new ...

2010

Rapid thickness reading of CH3NH3PbI3 nanowire thin films from color maps

László Forró, Bálint Náfrádi, Claudio Grimaldi, Endre Horvath, Massimo Spina

Hybrid halide perovskite photovoltaic materials show a remarkable light conversion efficiency in various optoelectronic devices. In the fabrication of these solar cells, light emitting diodes, laser and photodetector prototypes the thickness of the perovsk ...

Wiley-VCH Verlag2016

La@C82 as a spin-active filling of SWCNTs: ESR study of magnetic and photophysical properties

László Forró, Arnaud Magrez, Duncan Thomas Lindsay Alexander, Andrzej Sienkiewicz, Bálint Náfrádi, Katarzyna Pierzchala, Luka Ciric

Electron microscopy (TEM) and electron spin resonance ESR) were applied to characterize lanthanum metallofullerene(La@C82)-filled peapods. The peapods were prepared by encapsulation of La@C82 in SWCNTs, which were obtained by laser ablation technique in th ...

2008

Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasi-optical reflection bridge

László Forró, Bálint Náfrádi, Richard Gaal

We report the development of the frequency-modulation (FM) method for measuring electron spin resonance (ESR) absorption in the 210- to 420 GHz frequency range. We demonstrate that using a high-frequency ESR spectrometer without resonating microwave compon ...

Academic Press Inc - Elsevier Science2008

Electron spin resonance in alkali doped SWCNTs

László Forró, Bálint Náfrádi

Electron spin resonance (ESR) measurements on SWCNTs doped with alkali atoms (potassium) using a solid state reaction is reported. We find the emergence of the ESR signal of itinerant electrons upon doping with a signal intensity that is comparable to that ...

2008

Dinuclear clathrochelate complexes with pendent cyano groups as metalloligands

Rosario Scopelliti, Kay Severin, Henrik Moodysson Rønnow, Philip Pattison, Ivica Zivkovic, Bálint Náfrádi, Euro Solari, Giacomo Cecot, Mathieu Jérémie Marmier, José Luis Bila

Dinuclear clathrochelate complexes with two, three, four, or five cyano groups in the ligand periphery were prepared following two distinct synthetic strategies: (a) zinc(II)- or cobalt(II)-templated polycondensation reactions of CN-functionalized arylboro ...

2016

Molecular and Spin Dynamics in the Paramagnetic Endohedral Fullerene Gd3N@C-80

László Forró, Bálint Náfrádi, Agnes Antal

Gd3N@C-80 endohedral fullerene, a starting material for a potential magnetic resonance imaging contrast agent, is investigated by high-frequency electron spin resonance (ESR) and SQUID magnetometry. The magnetic moments of the three Gd ions of the endohedr ...

Amer Chemical Soc2012