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László Forró

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Related publications (298)

Photocatalytic Nanowires-Based Air Filter: Towards Reusable Protective Masks

László Forró, Andrzej Sienkiewicz, Endre Horvath, Caroline Lehmann

In the last couple decades, several viral outbreaks resulting in epidemics and pandemics with thousands of human causalities have been witnessed. The current Covid-19 outbreak represents an unprecedented crisis. In stopping the virus' spread, it is fundame ...

WILEY-V C H VERLAG GMBH2020

Kilogram-Scale Crystallogenesis of Halide Perovskites for Gamma-Rays Dose Rate Measurements

László Forró, Andrzej Sienkiewicz, Bálint Náfrádi, Endre Horvath, Pavel Frajtag, Andreas Pautz, Vincent Pierre Lamirand, Pavao Roko Andricevic, Márton Kollár

Gamma-rays (gamma-rays), wherever present, e.g., in medicine, nuclear environment, or homeland security, due to their strong impact on biological matter, should be closely monitored. There is a need for simple, sensitive gamma-ray detectors at affordable p ...

2020

Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides

Helmuth Berger, László Forró

Charge density wave (CDW) is a startling quantum phenomenon, distorting a metallic lattice into an insulating state with a periodically modulated charge distribution. Astonishingly, such modulations appear in various patterns even within the same family of ...

Nature Research2020

Ultralong Spin Lifetime in Light Alkali Atom Doped Graphene

László Forró, Bálint Náfrádi, Péter Szirmai, Bence Gábor Márkus

Today's great challenges of energy and informational technologies are addressed with a singular compound, Li-and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene ...

AMER CHEMICAL SOC2020

Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet Co1/3NbS2

Helmuth Berger, László Forró, Edoardo Martino

The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quantized anomalous Hall conductance can, in principle, be observed. Here we pres ...

AMER PHYSICAL SOC2020

Quantum spin-liquid states in an organic magnetic layer and molecular rotor hybrid

László Forró, Bálint Náfrádi, Andrea Pisoni, Péter Szirmai, Edoardo Martino, Konstantins Mantulnikovs

The exotic properties of quantum spin liquids (QSLs) have continually been of interest since Anderson's 1973 ground-breaking idea. Geometrical frustration, quantum fluctuations, and low dimensionality are the most often evoked material's characteristics th ...

National Academy of Sciences2020

Mahan excitons in room-temperature methylammonium lead bromide perovskites

László Forró, Majed Chergui, Ana Akrap, Endre Horvath, Tania Palmieri, Edoardo Baldini, Márton Kollár

In a seminal paper, Mahan predicted that excitonic bound states can still exist in a semiconductor at electron-hole densities above the insulator-to-metal Mott transition. However, no clear evidence for this exotic quasiparticle, dubbed Mahan exciton, exis ...

Nature Publishing Group2020

Tuning Conductivity and Spin Dynamics in Few-Layer Graphene via In Situ Potassium Exposure

László Forró, Bálint Náfrádi, Péter Szirmai, Olivér Sági, Ferenc Simon, Sándor Kollarics, Bence Gábor Márkus

Chemical modification such as intercalation or doping of novel materials is of great importance for exploratory material science and applications in various fields of physics and chemistry. Herein, the systematic intercalation of chemically exfoliated few- ...

2020

Radiation detection and energy conversion in nuclear reactor environments by hybrid photovoltaic perovskites

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

Detection and direct power conversion of high energy and high intensity ionizing radiation could be a key element in next generation nuclear reactor safety systems and space-born devices. For example, the Fukushima catastrophe in 2011 could have been large ...

Elsevier2020

Tailoring thermal conduction in anatase TiO2

Luca Rossi, Helmuth Berger, László Forró, Jacim Jacimovic, Endre Horvath, Xavier François Mettan, Andrea Pisoni, Péter Szirmai

Thermal conductivity (κ) plays an essential role in functional devices. It is advantageous to design materials where one can tune κ in a wide range according to its function: single-crystals and nanowires of anatase polymorph of titanium dioxide, broadly u ...

Springer2019

Persistent antiferromagnetic order in heavily overdoped Ca1-xLaxFeAs2

László Forró, Ana Akrap, Henrik Moodysson Rønnow, Ivica Zivkovic, Sergiy Katrych, Edoardo Martino, Philip Johannes Walter Moll, Maja Deborah Bachmann

In the Ca1-xLaxFeAs2 (1 1 2) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by a high-pressure, high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition at T-N = 12 ...

2019

Improved Alkali Intercalation of Carbonaceous Materials in Ammonia Solution

László Forró, Bálint Náfrádi, Péter Szirmai, Ferenc Simon, Sándor Kollarics, Bence Gábor Márkus

Alkali-intercalated graphite compounds represent a compelling modification of carbon with significant application potential and various fundamentally important phases. The intercalation of graphite with alkali atoms (Li and K) using liquid ammonia solution ...

WILEY-V C H VERLAG GMBH2019

Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping

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

Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (

2019

Pressure-induced transformation of CH3NH3PbI3: the role of the noble-gas pressure transmitting media

László Forró, Andrzej Sienkiewicz, Alla Arakcheeva, Bálint Náfrádi, Endre Horvath, Anastasiia Glushkova, Márton Kollár, Gaétan Charles Antoine Giriat

The photovoltaic perovskite, methylammonium lead triiodide [CH3NH3PbI3 (MAPbI(3))], is one of the most efficient materials for solar energy conversion. Various kinds of chemical and physical modifications have been applied to MAPbI(3) towards better unders ...

International Union of Crystallography (IUCr)2019

Differential Response of the Photoluminescence and Photocurrent of Polycrystalline CH(3)NH(3)PbI(3 )and CH3NH3PbBr3 to the Exposure to Oxygen and Nitrogen

László Forró, Andrzej Sienkiewicz, Endre Horvath, Anastasiia Glushkova, Márton Kollár, Konstantins Mantulnikovs

Because of their excellent photoelectric properties, organic-inorganic metal halide perovskites (MHPs), such as methylammonium lead triiodide, CH3NH3PbI3 (MAPbI(3)), and methylammonium lead tribromide, CH3NH3PbBr3 (MAPbBr(3)), are of great interest for the ...

2019

Effect of Thermal Cycling on the Structural Evolution of Methylammonium Lead Iodide Monitored around the Phase Transition Temperatures

László Forró, Alla Arakcheeva, Endre Horvath, Anastasiia Glushkova, Gaétan Charles Antoine Giriat, Konstantins Mantulnikovs, Konstantin Semeniuk

Optoelectronic devices and solar cells based on organometallic hybrid perovskites have to operate over a broad temperature range, which may contain their structural phase transitions. For instance, the temperature of 330 K, associated with the tetragonal-c ...

2019

Light-Emitting Electrochemical Cells of Single Crystal Hybrid Halide Perovskite with Vertically Aligned Carbon Nanotubes Contacts

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

Based on the reported ion migration under an electric field in hybrid lead halide perovskites we have developed a bright, light-emitting electrochemical cell with CH3NH3PbBr3 single crystals directly grown on vertically aligned carbon nanotube forests as c ...

2019

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

Characterizing the maximum number of layers in chemically exfoliated graphene

László Forró, Bálint Náfrádi, Péter Szirmai, Julian Ayrton Englert, Ferenc Simon, Bence Gábor Márkus

An efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical uppe ...

Springer Nature2019

Electrical transport in onion-like carbon-PMMA nanocomposites

László Forró, Claudio Grimaldi, Arnaud Magrez, Maryam Majidian

We report electrical conductivity measurements of polymethyl-methacrylate filled by onion-like carbon particles with a primary particle size of approximate to 5 nm. We show that the conductivity sigma is exceptionally high even at very low loadings and tha ...

AMER INST PHYSICS2019

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