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Gebru M, Subramanian P, Bělský P, Yadav RS, Pitussi I, Sasi S, Medlín R, Minar J, Švec P, Kornweitz H, Schechter A. Chemical-Dealloying-Derived PtPdPb-Based Multimetallic Nanoparticles: Dimethyl Ether Electrocatalysis and Fuel Cell Application. ACS Appl Mater Interfaces 2023; 15. [PMID: 38032342 PMCID: PMC10726307 DOI: 10.1021/acsami.3c11003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 12/01/2023]
Abstract
In this work, we report a novel multimetallic nanoparticle catalyst composed of Pt, Pd, and Pb and its electrochemical activity toward dimethyl ether (DME) oxidation in liquid electrolyte and polymer electrolyte fuel cells. Chemical dealloying of the catalyst with the lowest platinum-group metal (PGM) content, Pt2PdPb2/C, was conducted using HNO3 to tune the catalyst activity. Comprehensive characterization of the chemical-dealloying-derived catalyst nanoparticles unambiguously showed that the acid treatment removed 50% Pb from the nanoparticles with an insignificant effect on the PGM metals and led to the formation of smaller-sized nanoparticles. Electrochemical studies showed that Pb dissolution led to structural changes in the original catalysts. Chemical-dealloying-derived catalyst nanoparticles made of multiple phases (Pt, Pt3Pb, PtPb) provided one of the highest PGM-normalized power densities of 118 mW mgPGM-1 in a single direct DME fuel cell operated at low anode catalyst loading (1 mgPGM cm-2) at 70 °C. A possible DME oxidation pathway for these multimetallic catalysts was proposed based on an online mass spectrometry study and the analysis of the reaction products.
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Affiliation(s)
| | - Palaniappan Subramanian
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
| | - Petr Bělský
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
| | | | - Itay Pitussi
- Department
of Chemical Science, Ariel University, 40700 Ariel, Israel
| | - Sarath Sasi
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
| | - Rostislav Medlín
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
| | - Jan Minar
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
| | - Peter Švec
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovak Republic
| | - Haya Kornweitz
- Department
of Chemical Science, Ariel University, 40700 Ariel, Israel
| | - Alex Schechter
- Department
of Chemical Science, Ariel University, 40700 Ariel, Israel
- Research
and Development Centre for Renewable Energy, New Technologies Research
Centre (NTC), University of West Bohemia, Univerzitni, 8/2732, 301 00 Pilsen, Czech Republic
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2
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Křenek T, Vála L, Medlín R, Pola J, Jandová V, Vavruňková V, Mikysek P, Bělský P, Koštejn M. A novel route of colloidal chemistry: room temperature reactive interactions between titanium monoxide and silicon monoxide sols produced by laser ablation in liquid resulting in the formation of titanium disilicide. Dalton Trans 2022; 51:13831-13847. [PMID: 36039852 DOI: 10.1039/d2dt02065c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In spite of advanced research on functional colloidal inorganic nanoparticles and their reactivity, room temperature reactive interactions between two different colloids have remained challenging so far. Laser ablation of titanium monoxide and silicon monoxide in ethanol and water allows the generation of TiO-derived and SiO-derived colloidal nanoparticles which were characterized for their stability, size distribution and zeta potentials with dynamic light scattering and after evaporation of solvent examined for their morphology, chemical and phase composition by scanning electron microscopy, Raman spectroscopy, high resolution transmission electron microscopy and electron diffraction and small angle X-ray scattering. Aqueous and ethanolic TiO-derived colloids consist of anatase and monoclinic TiO, while ethanolic SiO-derived colloids are composed of crystalline and amorphous Si, nanocrystalline Si and SiO2 and aqueous SiO-derived colloids contain, in addition to these phases, a high pressure form of cristobalite. Simple room temperature mixing of ethanolic TiO- and SiO-derived colloids allows the formation of TiSi2, which is a case of so far unreported room temperature reactive interactions between two colloidal species. All colloids absorb solar light and act as photocatalysts for methylene blue degradation. These findings present a challenge for further search for feasible room-temperature reactions between distinct colloidal particles and open the potential for green synthesis of other desirable and hardly achievable phases.
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Affiliation(s)
- Tomáš Křenek
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic.
| | - Lukáš Vála
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic.
| | - Rostislav Medlín
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic.
| | - Josef Pola
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic. .,Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 135, 165 02, Prague 6, Czech Republic
| | - Věra Jandová
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic. .,Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 135, 165 02, Prague 6, Czech Republic
| | - Veronika Vavruňková
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic.
| | - Petr Mikysek
- Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 165 00, Praha 6, Czech Republic
| | - Petr Bělský
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic.
| | - Martin Koštejn
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14, Pilsen, Czech Republic. .,Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 135, 165 02, Prague 6, Czech Republic
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3
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Remiš T, Bělský P, Kovářík T, Kadlec J, Ghafouri Azar M, Medlín R, Vavruňková V, Deshmukh K, Sadasivuni KK. Study on Structure, Thermal Behavior and Viscoelastic Properties of Nanodiamond-Reinforced Poly (vinyl alcohol) Nanocomposites. Polymers (Basel) 2021; 13:1426. [PMID: 33925200 PMCID: PMC8124898 DOI: 10.3390/polym13091426] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 12/15/2022] Open
Abstract
In this work, advanced polymer nanocomposites comprising of polyvinyl alcohol (PVA) and nanodiamonds (NDs) were developed using a single-step solution-casting method. The properties of the prepared PVA/NDs nanocomposites were investigated using Raman spectroscopy, small- and wide-angle X-ray scattering (SAXS/WAXS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). It was revealed that the tensile strength improved dramatically with increasing ND content in the PVA matrix, suggesting a strong interaction between the NDs and the PVA. SEM, TEM, and SAXS showed that NDs were present in the form of agglomerates with an average size of ~60 nm with primary particles of diameter ~5 nm. These results showed that NDs could act as a good nanofiller for PVA in terms of improving its stability and mechanical properties.
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Affiliation(s)
- Tomáš Remiš
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Petr Bělský
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Tomáš Kovářík
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Jaroslav Kadlec
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Mina Ghafouri Azar
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Rostislav Medlín
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Veronika Vavruňková
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
| | - Kalim Deshmukh
- New Technologies—Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic; (P.B.); (T.K.); (J.K.); (M.G.A.); (R.M.); (V.V.); (K.D.)
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Křenek T, Vála L, Kovářík T, Medlín R, Fajgar R, Pola J, Jandová V, Vavruňková V, Pola M, Koštejn M. Novel perspectives of laser ablation in liquids: the formation of a high-pressure orthorhombic FeS phase and absorption of FeS-derived colloids on a porous surface for solar-light photocatalytic wastewater cleaning. Dalton Trans 2020; 49:13262-13275. [PMID: 32966468 DOI: 10.1039/d0dt01999b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pulsed Nd : YAG laser ablation of FeS in water and ethanol produces FeS-derived colloidal nanoparticles that absorb onto immersed porous ceramic substrates and create solar-light photocatalytic surfaces. The stability, size distribution and zeta potential of the nanoparticles were assessed by dynamic light scattering. Raman, UV-Vis and XP spectroscopy and electron microscopy reveal that the sol nanoparticles have their outmost layer composed of ferrous and ferric sulphates and those produced in water are made of high-pressure orthorhombic FeS, cubic magnetite Fe3O4 and tetragonal maghemite γ-Fe2O3, while those formed in ethanol contain hexagonal FeS and cubic magnetite Fe3O4. Both colloids absorb solar light and their adsorption to porous ceramic surfaces creates functionalized ceramic surfaces that induce methylene blue degradation by daylight. The laser induced process thus offers an easy and efficient way for the functionalization of porous surfaces by photocatalytic nanoparticles that avoids aggregation in the liquid phase. The formation of an orthorhombic high-pressure FeS phase stable under ambient conditions is the first example of high-pressure structures produced by laser ablation in liquid without the assistance of an electric field.
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Affiliation(s)
- Tomáš Křenek
- New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14 Pilsen, Czech Republic.
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5
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Vála L, Medlín R, Koštejn M, Karatodorov S, Jandová V, Vavruňková V, Křenek T. Laser‐Induced Reactive Deposition of Nanostructured CoS
2
‐ and Co
2
CuS
4
‐Based Films with Fenton Catalytic Properties. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801403] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Lukáš Vála
- New Technologies ‐ Research Centre University of West Bohemia Univerzitni 8 306 14 Pilsen Czech Republic
| | - Rostislav Medlín
- New Technologies ‐ Research Centre University of West Bohemia Univerzitni 8 306 14 Pilsen Czech Republic
| | - Martin Koštejn
- Institute of Chemical Process Fundamentals Academy of Sciences of the Czech Republic Rozvojová 135 160 00 Prague Czech Republica
| | - Stefan Karatodorov
- Georgi Nadjakov Institute of Solid State Physics Bulgarian Academy of Sciences 72 Tzarigradsko Chaussee 1784 Sofia Bulgaria
| | - Věra Jandová
- Institute of Chemical Process Fundamentals Academy of Sciences of the Czech Republic Rozvojová 135 160 00 Prague Czech Republica
| | - Veronika Vavruňková
- New Technologies ‐ Research Centre University of West Bohemia Univerzitni 8 306 14 Pilsen Czech Republic
| | - Tomáš Křenek
- New Technologies ‐ Research Centre University of West Bohemia Univerzitni 8 306 14 Pilsen Czech Republic
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6
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Mayorga-Martinez CC, Sofer Z, Luxa J, Huber Š, Sedmidubský D, Brázda P, Palatinus L, Mikulics M, Lazar P, Medlín R, Pumera M. TaS 3 Nanofibers: Layered Trichalcogenide for High-Performance Electronic and Sensing Devices. ACS Nano 2018; 12:464-473. [PMID: 29227684 DOI: 10.1021/acsnano.7b06853] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Layered materials, like transition metal dichalcogenides, exhibit broad spectra with outstanding properties with huge application potential, whereas another group of related materials, layered transition metal trichalcogenides, remains unexplored. Here, we show the broad application potential of this interesting structural type of layered tantalum trisulfide prepared in a form of nanofibers. This material shows tailorable attractive electronic properties dependent on the tensile strain applied to it. Structure of this so-called orthorhombic phase of TaS3 grown in a form of long nanofibers has been solved and refined. Taking advantage of these capabilities, we demonstrate a highly specific impedimetric NO gas sensor based on TaS3 nanofibers as well as construction of photodetectors with excellent responsivity and field-effect transistors. Various flexible substrates were used for the construction of a NO gas sensor. Such a device exhibits a low limit of detection of 0.48 ppb, well under the allowed value set by environmental agencies for NOx (50 ppb). Moreover, this NO gas sensor also showed excellent selectivity in the presence of common interferences formed during fuel combustion. TaS3 nanofibers produced in large scale exhibited excellent broad application potential for various types of devices covering nanoelectronic, optoelectronic, and gas-sensing applications.
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Affiliation(s)
- Carmen C Mayorga-Martinez
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences Nanyang Technological University , Nanyang Link 21, Singapore 637371
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - Jan Luxa
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - Štěpán Huber
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - David Sedmidubský
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - Petr Brázda
- Institute of Physics of the CAS , v.v.i., Na Slovance 2, 182 00 Prague 8, Czech Republic
| | - Lukáš Palatinus
- Institute of Physics of the CAS , v.v.i., Na Slovance 2, 182 00 Prague 8, Czech Republic
| | - Martin Mikulics
- Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, and Jülich-Aachen Research Alliance, JARA, Fundamentals of Future Information Technology, D-52425 Jülich, Germany
| | - Petr Lazar
- Department of Physical Chemistry and Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc , tř. 17. Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Rostislav Medlín
- New Technologies - Research Centre, University of West Bohemia , Univerzitní 8, 306 14 Plzeň, Czech Republic
| | - Martin Pumera
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences Nanyang Technological University , Nanyang Link 21, Singapore 637371
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
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7
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Málek J, Hnilica F, Veselý J, Smola B, Medlín R. The effect of annealing temperature on the properties of powder metallurgy processed Ti-35Nb-2Zr-0.5O alloy. J Mech Behav Biomed Mater 2017; 75:252-261. [PMID: 28756286 DOI: 10.1016/j.jmbbm.2017.07.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/10/2017] [Accepted: 07/22/2017] [Indexed: 11/17/2022]
Abstract
Ti-35Nb-2Zr-0.5O (wt%) alloy was prepared via a powder metallurgy process (cold isostatic pressing of blended elemental powders and subsequent sintering) with the primary aim of using it as a material for bio-applications. Sintered specimens were swaged and subsequently the influence of annealing temperature on the mechanical and structural properties was studied. Specimens were annealed at 800, 850, 900, 950, and 1000°C for 0.5h and water quenched. Significant changes in microstructure (i.e. precipitate dissolution or grain coarsening) were observed in relation to increasing annealing temperature. In correlation with those changes, the mechanical properties were also studied. The ultimate tensile strength increased from 925MPa (specimen annealed at 800°C) to 990MPa (900°C). Also the elongation increased from ~ 13% (800°C) to more than 20% (900, 950, and 1000°C).
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Affiliation(s)
- Jaroslav Málek
- UJP PRAHA a.s., Nad Kamínkou 1345, 156 00, Prague-Zbraslav, Czech Republic; Czech Technical University in Prague, Faculty of Mechanical Engineering, Karlovo náměstí 13, 121 35 Praha 2, Czech Republic.
| | - František Hnilica
- UJP PRAHA a.s., Nad Kamínkou 1345, 156 00, Prague-Zbraslav, Czech Republic
| | - Jaroslav Veselý
- UJP PRAHA a.s., Nad Kamínkou 1345, 156 00, Prague-Zbraslav, Czech Republic
| | - Bohumil Smola
- Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
| | - Rostislav Medlín
- New Technology Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic
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8
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Jankovič L, Végsö K, Šiffalovič P, Šauša O, Čaplovič L, Čaplovičová M, Medlín R, Uhlík P, Nógellová Z. XRD, SAXS, and PALS investigations of three different polymers reinforced with tetraoctylammonium exchanged montmorillonite. International Journal of Polymer Analysis and Characterization 2016. [DOI: 10.1080/1023666x.2016.1176760] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Luxa J, Jankovský O, Sedmidubský D, Medlín R, Maryško M, Pumera M, Sofer Z. Origin of exotic ferromagnetic behavior in exfoliated layered transition metal dichalcogenides MoS2 and WS2. Nanoscale 2016; 8:1960-7. [PMID: 26538458 DOI: 10.1039/c5nr05757d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Bulk layered transition metal dichalcogenides (TMDs) show diamagnetic properties. When exfoliated, the materials' band gap increases and changes from an indirect band gap to a direct one. During the exfoliation, the TMDs may undergo a phase transition from 2H to 1T polymorph, which is likely electronically driven and accompanied by a metal-insulator transition. A significantly higher efficiency of the exfoliation was observed using sodium naphthalenide compared to butyllithium. Moreover we demonstrate that the exfoliation has a dramatic influence on the magnetic properties of two TMDs, MoS2 and WS2. These materials become partly ferromagnetic upon exfoliation, which is a highly unexpected behavior. Exotic ferromagnetism is generally observed on samples with a high degree of exfoliation, which indicates the association of this effect with defects formed on the edges of dichalcogenide sheets. Such an exotic ferromagnetic behavior, if properly understood and brought under material engineering control, shall open the door to new applications of these materials.
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Affiliation(s)
- Jan Luxa
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Ondřej Jankovský
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - David Sedmidubský
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Rostislav Medlín
- New Technologies - Research Centre (NTC) at University of West Bohemia (UWB), CZ-30614 Pilsen, Czech Republic
| | - Miroslav Maryško
- Institute of Physics of the ASCR, v.v.i., Cukrovarnická 10/112, 162 00 Prague 6, Czech Republic
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
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10
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Novák P, Sutta P, Medlín R, Netrvalová M, Ríha J. Investigation of Preferred Orientation of ZnO Thin Films Prepared by Magnetron Sputtering. ACTA ACUST UNITED AC 2014. [DOI: 10.1166/sl.2014.3399] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Václavík M, Dudák M, Novák V, Medlín R, Štěpánek F, Marek M, Kočí P. Yeast cells as macropore bio-templates enhancing transport properties and conversions in coated catalyst layers for exhaust gas oxidation. Chem Eng Sci 2014. [DOI: 10.1016/j.ces.2014.04.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Siddheswaran R, Medlín R, Bělský P, Vavruňková V, Očenášek J, David B, Šutta P. Heterogeneous phase formation in diluted magnetic semiconducting Zn1−x−yCoxAlyO (CAZO) nanoparticles. RSC Adv 2014. [DOI: 10.1039/c4ra02973a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This article reports a systematic investigation of the synthesis and structural characterization of composite CAZO [(Zn1−x−yCoxAlyO; x = 0.04, 0.03, 0.02; y = 0.01, 0.02, 0.03)] nanoparticles from combustion.
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Affiliation(s)
- R. Siddheswaran
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
| | - R. Medlín
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
| | - P. Bělský
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
| | - V. Vavruňková
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
| | - J. Očenášek
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
| | - B. David
- CEITEC IPM
- Institute of Physics of Materials
- ASCR
- CZ-61662 Brno, Czech Republic
| | - P. Šutta
- New Technologies Research Centre
- University of West Bohemia in Pilsen
- Plzeň-30614, Czech Republic
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13
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Krenek T, Fajgar R, Medlín R, Klementová M, Novotný F, Drínek V. Fabrication of CuxGey nanoplatelets. J Nanosci Nanotechnol 2011; 11:8279-8283. [PMID: 22097569 DOI: 10.1166/jnn.2011.5080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Modern technologies demand novel alloy materials for advanced devices and applications. Here we report on Low Pressure Chemical Vapor Deposition (LPCVD) of Ge2Me6 and SnMe4 leading to deposition of nanoplatelets along with nanoparticles. According to analytical techniques (Raman spectroscopy, ED, EDX, SEM and HRTEM) the nanoplatelets up to several tens of microm in length have been prepared in two alloy modifications orthorhombic Cu3Ge and hexagonal Cu86Ge14. Thickness of the nanoplatelets ranges from 50 to 150 nm. CuSn seeds served for the growth of Ge nanoparticles scattered among nanoplatelets.
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Affiliation(s)
- T Krenek
- University of West Bohemia, New Technologies-Research Centre, 30614 Plzen, Czech Republic
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