Eva Majkova

Eva Majkova
Slovak Academy of Sciences | SAV · Institute of Physics

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301
Publications
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2,052
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Publications

Publications (301)
Article
Hypothesis One of the highlighted properties of Ti3C2Tx MXene compared to other 2D nanomaterials is its hydrophilicity. However, the broad range of static contact angles of Ti3C2Tx reported in the literature is misleading. To elucidate the experimental values of the static contact angles and get reproducible contact angle data, it is wiser to perfo...
Article
Chemical vapor deposition (CVD) is commonly used for the large-scale synthesis of the films of two-dimensional (2D) transition metal dichalcogenide (TMD) materials, including MoS2 thin films, which have potential applications in optoelectronics, catalysis, and nanoelectronics. As far as thin film of MoS2 is concerned, the influence of deposition pa...
Article
The synergistic effect of high-quality NiOx hole transport layers (HTLs) deposited by ion beam sputtering on ITO substrates and the Ti3C2Tx MXene doping of CH3NH3PbI3 (MAPI) perovskite layers is investigated in order to improve the power conversion efficiency (PCE) of p-i-n perovskite solar cells (PSCs). The 18 nm thick NiOx layers are pinhole-free...
Article
Full-text available
A perovskite solar cell (PSC) featuring a mesoporous architecture can facilitate perovskite layer formation over a large area via increasing the number of heterogeneous nucleation sites. The morphology of the electron transport layer (ETL) and its interface with the perovskite layer is one of the key factors to boost the performance of a PSC. Tin d...
Article
We present a simultaneous in situ measurement of X-ray scattering and photoluminescence (PL) spectroscopy during organic thin-film growth in a vacuum. We have designed a modified deposition chamber that broadens its utilization and enables complementary information on the structure and optoelectronic properties. In a pilot experiment, we investigat...
Article
Despite extensive studies on the archetypal poly(3-hexylthiophene-2,5-diyl) (P3HT) over the past decade, a concurrent investigation of the surface roughness influence on polymorphism, density of states (DOS), photoluminescence (PL), and hole mobility is missing. We report on the effect of substrate roughness on the optical and electrical properties...
Article
Full-text available
Acute myeloid leukemia is a highly aggressive type of cancer caused by the uncontrolled proliferation of undifferentiated myeloblasts, affecting the bone marrow and blood. Systemic chemotherapy is considered the primary treatment strategy; unfortunately, healthy cells are also affected to a large extent, leading to severe side effects of this treat...
Article
A four-bounce monochromator assembly composed of Ge(111) and Ge(220) monolithic channel-cut monochromators with V-shaped channels in a quasi-dispersive configuration is presented. The assembly provides an optimal design in terms of the highest transmittance and photon flux density per detector pixel while maintaining high beam collimation. A monoch...
Article
Perovskite solar cells are well‐known for their high energy conversion efficiency, low‐temperature processing, and cost‐effective production. Flash infrared annealing (FIRA) of slot‐die cast perovskite precursors offers an attractive manufacturing route using high‐throughput roll‐to‐roll technology. Despite the recent progress in FIRA perovskite an...
Article
We report on the real-time structure formation and growth of two thiophene-based organic semiconductors, 5,5′-bis(naphth-2-yl)-2,2′-bi- and 5,5′′-bis(naphth-2-yl)-2,2′:5′,2′′-terthiophene (NaT2 and NaT3), studied in situ during vacuum deposition by grazing-incidence x-ray diffraction and supported by atomic force microscopy and photoabsorption spec...
Article
The development of defect analysis for inorganic semiconductors in the past century paved the way for the success story of today's electronics. By analogy, defect analysis plays a critical role in developing and improving devices based on organic molecular semiconductors. However, because of weak molecular interactions, absent in inorganic semicond...
Article
Some of the distinct optical, catalytical, and electronic properties of few-layer MoS2 films arise from a specific orientation of the MoS2 layers. The growth of horizontally or vertically aligned MoS2 during the sulfurization of predeposited Mo film can be controlled by various physical conditions such as temperature, heating rate, Mo film thicknes...
Article
Full-text available
2D hybrid organic–inorganic perovskites are valued in optoelectronic applications for their tunable bandgap and excellent moisture and irradiation stability. These properties stem from both the chemical composition and crystallinity of the layer formed. Defects in the lattice, impurities, and crystal grain boundaries generally introduce trap states...
Article
Tribological properties of a surface are controlled by its topography and chemical structure as suggested by theoretical studies. However, the effect of crystallographic orientation on the tribological properties is still controversial. By tuning the heating rate during sulfurization of CVD Mo films, we prepared the few-layer MoS2 films with simila...
Article
Gel filtration is a versatile technique employed for biological molecules and nanoparticles, offering their reproducible classification based on size and shape. Colloidal nanoparticles are of significant interest in biomedical applications due to a large number of solution-based bioconjugation procedures. Nevertheless, the inherent polydispersity o...
Article
Bacillus subtilis spore coat is a bacterial proteinaceous structure with amazing characteristics of self-organization, unique resiliency, toughness and flexibility in the same time. The spore coat represents a complex multilayered protein structure which is composed of over 80 coat proteins. Some of these proteins form two dimensional crystal struc...
Article
Oligothiophenes and their functionalized derivatives have been shown to be a viable option for high-performance organic electronic devices. The functionalization of oligothiophene-based materials allows further tailoring of their properties for specific applications. We have synthesized a new thiophene-based molecule 1-[5′-(2-naphthyl)-2,2′-bithiop...
Article
The crystallographic alignment of an ultra-thin MoS2 film strongly influences its properties and is, therefore, substantial for various applications. Developing the methods for controlled growth is of primary importance for a reproducible film fabrication. Among them, sulfurization of pre-deposited molybdenum or molybdenum oxide films is a method c...
Article
A laboratory in situ grazing-incidence small-angle X-ray scattering (GISAXS) tracking of the self-assembled growth of a regular 3D Ge quantum dot (QD) structure in an amorphous Al 2 O 3 matrix during the ion beam sputter deposition of a periodic Ge/Al 2 O 3 multilayer on silicon is reported. A 573 K substrate temperature proved to be necessary to a...
Article
Two-dimensional materials as graphene oxide (GO) are enable to accommodate labels as well as toxins for diagnostics and therapy, respectively. The transmembrane protein carbonic anhydrase (CA IX) is one of the molecules selectively expressed by tumor cells. Here, we demonstrate bioconjugation of GO to biotinylated M75 antibody highly selective towa...
Article
A large number of low-dimensional nanomaterials having different shapes and being dispersible in solvents open a fundamental question if there is a universal deposition technique for the monolayer formation. A monolayer formation of various nanomaterials at the air-water interface, also known as a Langmuir film, is a well-established technique even...
Article
Recent advances in the liquid-phase exfoliation enabled large-scale production of two-dimensional (2D) materials, including few-layer graphene and transition metal dichalcogenides. The exfoliated flakes of 2D materials allow cost-effective deposition of continuous films for various applications ranging from optoelectronics to lubrication technology...
Article
The incorporation of carbon nanotubes (CNTs) into a polymer matrix can significantly improve its mechanical and electrical properties. In the case of the aligned CNTs in a polymer matrix, the mechanical properties along the alignment direction are significantly enhanced comparing to the perpendicular direction. Hence, the CNT alignment is a crucial...
Article
Hybrid materials of π-conjugated molecular semiconductors combined with 2D materials exhibit significant potential for novel (opto)electronics. The overall characteristics of molecular growth, such as molecular packing, crystallographic structure and morphology, determine the specific application. The growth studies are thus key for understanding a...
Article
Full-text available
Planar perovskite solar cells were fabricated on F-doped SnO2 (FTO) coated glass substrates, with 4,4'-((1E,1'E)-((1,2,4-thiadiazole-3,5-diyl)bis(azaneylylidene))bis(methaneylylidene))bis(N,N-di-p-tolylaniline) (bTAThDaz) as hole transport material. This imine was synthesized in one step reaction, starting from commercially available and relatively...
Article
A widely applicable method for aligning 1D materials, and in particular carbon nanotubes (CNTs), independent of their preparation would be very useful as the growth methods for these materials are substance-specific. Langmuir-Schaefer (LS) deposition could be such an approach for alignment, as it aligns a large number of 1D materials independently...
Article
We evaluate the application of surfactant-free liquid-phase exfoliated MoS2 nanosheets as a nanoplatform for a cancer detection and treatment system equipped with an antibody–antigen based recognition element. Employing antigen–antibody binding, we increased the probability of the endocytosis of MoS2 nanosheets into CAIX expressing cells by 30%. Th...
Article
We report on the microstructure, morphology, and growth of 5,5´-bis(naphth-2-yl)-2,2´-bithiophene (NaT2) thin films deposited on graphene, characterized by grazing- incidence X-ray diffraction (GIXRD) and complemented by atomic force microscopy (AFM) measurements. NaT2 is deposited on two types of graphene surfaces: custom-made samples where CVD-gr...
Article
Small π-conjugated organic molecules have attracted substantial attention in the past decade as they are considered as candidates for future organic-based (opto-)electronic applications. The molecular arrangement in the organic layer is one of the crucial parameters, which determine the efficiency of a given device. The desired orientation of the m...
Article
Ubiquitous carbon nanomaterials have great potential for emerging technologies, but they also pose a threat to human health at the end of their lifecycle, especially when they are introduced into waste or ground waters. Graphene field-effect transistors (GFET) and real time in situ confocal Raman microscopy (CRM) were employed to detect a submonola...
Article
Full-text available
The ongoing interest in two-dimensional (2D) layered materials has motivated extensive studies of transitional metal dichalcogenides, especially its most pronounced representative – MoS2. The few-layer MoS2 exhibits distinct properties from those in bulk, which predetermine its potential usage in optoelectronics and flexible devices. Recently, it w...
Article
Two‐dimensional transition metal dichalcogenides (TMD) attract high research interest due to their electronic properties and MoS2 is likely the most explored compound of this group. We report on the fabrication of MoS2 thin films by sulfurization of pre‐deposited MoO3 layers on a c‐plane sapphire substrate by RF magnetron sputtering from stoichiome...
Article
Full-text available
Few-layer MoS2 films are promising candidates for applications in numerous areas, such as photovoltaics, photocatalysis, nanotribology, lithium batteries, hydro-desulfurization catalysis and dry lubricants, especially due to their distinctive electronic, optical, and catalytic properties. In general, two alignments of MoS2 layers are possible - the...
Article
Atomic layer deposition (ALD) is exceptional deposition technique because it allows for growth of high quality films on large are substrates at low deposition temperatures. In our contribution ALD was employed for preparation of transparent conducting electrodes and for encapsulation of fabricated solar cells. Al-doped ZnO films were used for trans...
Article
Full-text available
The doping effect of carbon nanodots (CNDs) in the PC 61 BM electron-transport layer on the performance of inverted planar MAPbI 3 perovskite solar cells (PSCs) having two different kinds of the hole-transport layer, namely organic PEDOT:PSS and inorganic NiO x , was investigated. The CH 3 NH 3 PbI 3 perovskite layer was deposited in air at 35% hum...
Article
Few-layer MoS2 films stay at the forefront of current research of two-dimensional materials. At present, continuous MoS2 films are prepared by chemical vapor deposition (CVD) techniques. Herein, we present a cost-effective fabrication of the large-area spatially uniform films of few-layer MoS2 flakes using a modified Langmuir-Schaefer technique. Th...
Article
Research on two-dimensional (2D) atomic crystals is one of the highly progressive topics in (opto)electronics, as the van der Waals (vdW) interactions enable integration of 2D crystals with a broad range of materials. Organic π-conjugated molecules offer new opportunities for creating the so-called “hybrid” vdW heterostructures, in which their anis...
Article
Full-text available
Micro-Raman spectroscopy, scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) were used to study the effect of cutting speed and cutting depth on the mode of the single-point diamond fly cutting of Ge(110) surface via crystallinity of the chips. Reducing the cutting depth from 15 to 2 μm and concurrentl...
Article
A systematic study of beam-compressing monolithic channel-cut monochromators (CCMs) with a V-shaped channel was performed. The CCMs were optimized in terms of a chosen output beam parameter for exploitation in laboratory high-resolution small-angle X-ray scattering (SAXS) and grazing-incidence SAXS (GISAXS) experiments. Ray-tracing simulations prov...
Article
Full-text available
Diagnosis of oncological diseases remains at the forefront of current medical research. Carbonic Anhydrase IX (CA IX) is a cell surface hypoxia-inducible enzyme functionally involved in adaptation to acidosis that is expressed in aggressive tumors; hence, it can be used as a tumor biomarker. Herein, we propose a nanoscale graphene oxide (GO) platfo...
Article
It is generally accepted that the liquid-phase exfoliation (LPE) enables large-scale production of few-layer MoS2 flakes. In our work, we studied in detail the few-layer MoS2 oxidation in the course of standard LPE in the water/ethanol solution. We demonstrate that an increase of the initial MoS2 concentration above a certain threshold triggers a p...
Article
The ability to control the interparticle distance in self-assembled arrays of nanoparticles plays an important role in a large number of applications, which require tunable electronic and photonic properties. Importantly, practical applications in real devices rely on arrays satisfying more stringent requirements on lateral homogeneity controlled o...
Conference Paper
Surface functionalization of 2D MoS2 materials offers a convenient way to tune their properties and facilitate their application in the field of bio-sensing and nanomedicine. In this study, three different liquid phase exfoliation (LPE) methods were utilized for MoS2 exfoliation: LPE in 45% ethanol solution, LPE in ultrapure water and amino acid in...
Article
Full-text available
NO2 and H2 gas sensing by few-layer graphene (FLG) were studied in dependence on the annealing and decoration of graphene by palladium nanoparticles (NPs). Graphene was deposited onto SiO2 (500 nm)/Si substrates by a modified Langmuir-Schaefer technique. A solution of FLG flakes in 1-methyl-2-pyrrolidone was obtained by a mild sonication of the exp...
Article
Full-text available
This study was undertaken to determine the in vitro antifungal activities of super-hydrophobic nanoparticles (SHNPs), essential oils (EOs), and their mixtures (SHNPs/EOs). We have applied a thin layer of SHNPs in combination with various concentrations of three EOs: Arborvitae (Thuja plicata), Oregano (Origanum vulgare L.), and Thyme (Thymus vulgar...
Article
Full-text available
The last few decades faced on the fabrication of advanced engineering materials involving also different composites. Here, we report on the fabrication of few-layer molybdenum disulfide on top of thin polycrystalline diamond substrates with a high specific surface area. In the method, pre-deposited molybdenum coatings were sulfurized in a one-zone...
Article
Full-text available
Polymeric composites of the linear triblock copolymer poly(styrene-co-ethylene/butylene-co-styrene) grafted with maleic anhydride units (SEBS-MA) or MA modified by hydrophilic polyethylene glycol (PEG) and containing various amounts of multiwall carbon nanotubes (MWCNTs) as conducting filler—were prepared by solvent casting. The MWCNT surface was m...
Article
Graphene oxide (GO), a partially oxidized two-dimensional allotrope of carbon, is an attractive nanocarrier for cancer diagnostics and therapy. The nanometer-sized GO is known to permeate the cell membrane. Herein we studied the cellular uptake pathways of GO nanoflakes by cancer and non-cancerous cell lines. Employing the confocal Raman imaging, w...
Article
Full-text available
Surface nanomachining based on single-point diamond turning is a viable technology for the preparation of high-quality surfaces. It found its first extensive use in infrared optics, but it is also attractive for X-ray optics. The challenge is that the X-rays used in laboratories have wavelengths 4 orders of magnitude shorter than infrared radiation...
Article
The interaction between a graphene layer and pentacene (PEN) molecules leads to the formation of a lying-down phase, which can improve charge transport for organic vertical field effect transistors and enhance the optical absorption for increased light harvesting in organic solar cells. Here, we present a comprehensive study of PEN growth on epitax...
Article
Full-text available
We report on a study of thickness effect on the formation of structural defect-related density of states (DOS) in the band gap of poly(3-hexylthiophene-2,5-diyl) (P3HT) thin films spincoated on ITO substrates. The energy-resolved electrochemical impedance spectroscopy and grazing-incidence wide-angle X-ray scattering were used to correlate the DOS...
Conference Paper
Gas sensors based on mixtures of iron oxides nanoparticles (NPs) modified with Pd NPs at the different NPs Pd: Fe3O4/γ-Fe2O3 proportions were prepared and characterized. Nanoparticles diameter was 6–7 nm. NPs films were deposited from the mixtures of Fe3O4/γ-Fe2O3 and Pd NPs colloidal solutions by modified Langmuir-Schaeffer technique onto alumina...
Article
In this work, we present a study of the Langmuir film formation composed of hydrophobic carbon quantum dots (hCQDs). We studied the kinetics of hCQDs pyrolysis and optimized the reaction time for maximum photoluminescence. The resulting hCQDs were analyzed by transmission electron microscopy, X-ray photoemission spectroscopy and grazing-incidence X...