A5037647171- Metal and Thin Film Mechanics
- GaN-based semiconductor devices and materials
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Boron and Carbon Nanomaterials Research
- Ga2O3 and related materials
- Diamond and Carbon-based Materials Research
- ZnO doping and properties
- 2D Materials and Applications
- Graphene research and applications
- Silicon Carbide Semiconductor Technologies
- Advanced ceramic materials synthesis
- Semiconductor Quantum Structures and Devices
- Intermetallics and Advanced Alloy Properties
- Advanced materials and composites
- Acoustic Wave Resonator Technologies
- Semiconductor materials and interfaces
- Advancements in Solid Oxide Fuel Cells
- Copper Interconnects and Reliability
- Advanced Memory and Neural Computing
- Aluminum Alloys Composites Properties
- Advanced Photocatalysis Techniques
- Nanowire Synthesis and Applications
- Catalytic Processes in Materials Science
- Advanced Thermoelectric Materials and Devices
Thinfilm (Sweden)
2016-2025
Linköping University
2016-2025
Carleton University
2020
Ernst Ruska Centre
2014-2016
Forschungszentrum Jülich
2014-2016
RWTH Aachen University
2014-2016
Jülich Aachen Research Alliance
2015
University of California, Los Angeles
2013
TU Wien
2013
Abstract The exploration of two-dimensional solids is an active area materials discovery. Research in this has given us structures spanning graphene to dichalcogenides, and more recently 2D transition metal carbides (MXenes). One the challenges now master ordering within atomic sheets. Herein, we present a top-down, high-yield, facile route for controlled introduction ordered divacancies MXenes. By designing parent 3D laminate, (Mo 2/3 Sc 1/3 ) 2 AlC, with in-plane chemical ordering, by...
Structural design on the atomic level can provide novel chemistries of hybrid MAX phases and their MXenes. Herein, density functional theory is used to predict phase stability quaternary i-MAX with in-plane chemical order a general chemistry (W2/3M21/3)2AC, where M2 = Sc, Y (W), A Al, Si, Ga, Ge, In, Sn. Of over 18 compositions probed, only two—with monoclinic C2/c structure—are predicted be stable: (W2/3Sc1/3)2AlC (W2/3Y1/3)2AlC indeed found exist. Selectively etching Al Sc/Y atoms from...
Intercalated layered materials offer distinctive properties and serve as precursors for important two-dimensional (2D) materials. However, intercalation of non-van der Waals structures, which can expand the family 2D materials, is difficult. We report a structural editing protocol carbides (MAX phases) their derivatives (MXenes). Gap-opening species-intercalating stages were respectively mediated by chemical scissors intercalants, created large MAX phases with unconventional elements well...
The two-dimensional (2D) MXene Ti3C2Tx is functionalized by surface groups (Tx) that determine its properties for, e.g. electrochemical applications. coordination and thermal of these has, to date, not been investigated at the atomic level, despite strong variations in are predicted from different coordinations identity functional groups. To alleviate this deficiency, characterize surfaces single sheets, present investigation combines atomically resolved situ heating a scanning transmission...
Abstract The exploration of 2D solids is one our time's generators materials discoveries. A recent addition to the world MXenes that possses a rich chemistry due large parent family MAX phases. Recently, new type atomic laminated phases (coined i ‐MAX) reported, in which two different transition metal atoms are ordered basal planes. Herein, these ‐MAX used route for tailoriong MXene structure and composition. By employing etching protocols phase (Mo 2/3 Y 1/3 ) 2 AlC, resulting can be...
Global warming caused by burning of fossil fuels is indisputably one mankind's greatest challenges in the 21st century. To reduce ever-increasing CO2 emissions released into atmosphere, dry solid adsorbents with large surface-to-volume ratio such as carbonaceous materials, zeolites, and metal-organic frameworks have emerged promising material candidates for capturing . However, remain because limited /N2 selectivity long-term stability. The effective adsorption gas (≈12 mol kg-1 ) on...
Boridene: a 2D boride A range of two-dimensional (2D) materials, including graphene and hexagonal boron nitride, have been synthesized studied because the unusual properties that occur when one dimension becomes very small. MXenes are family materials made layers inorganic transition metal carbides nitrides few atoms thick manufactured by selective etching. Attempts to make similar boridene challenging reactive nature phases parent tend dissolve rather than selectively etch. Zhou et al . in...
Introducing point defects in two-dimensional (2D) materials can alter or enhance their properties. Here, we demonstrate how etching a laminated (Nb2/3Sc1/3)2AlC MAX phase (solid solution) of both the Sc and Al atoms results 2D Nb1.33C material (MXene) with large number vacancies vacancy clusters. This method is applicable to any quaternary, higher, phase, wherein one transition metals more reactive than other could be vital importance applications such as catalysis energy storage. We also...
Abstract Tuning and tailoring of surface terminating functional species hold the key to unlock unprecedented properties for a wide range applications largest 2D family known as MXenes. However, few routes are explored little is about extent which can saturate MXene surfaces. Among available terminations, atomic oxygen interest electrochemical energy storage, hydrogen evolution reaction, photocatalysis, etc. controlled oxidation surfaces not trivial due favored formation oxides. In present...
High-entropy (HE) ceramics, by analogy with HE metallic alloys, are an emerging family of multielemental solid solutions. These materials offer a large compositional space, corresponding range properties. Here, we report the experimental realization 3D MAX phase, Ti1.0V0.7Cr0.05Nb1.0Ta1.0AlC3, and 2D MXene in form freestanding flakes average composition Ti1.1V0.7CrxNb1.0Ta0.6C3Tz (Tz = −F, −O, −OH), as produced selective removal Al from phase aqueous hydrofluoric acid (HF). Initial tests on...
Piezoelectric wurtzite ScxAl1−xN (x = 0, 0.1, 0.2, 0.3) thin films were epitaxially grown by reactive magnetron co-sputtering from elemental Sc and Al targets. Al2O3(0001) wafers with TiN(111) seed electrode layers used as substrates. X-ray diffraction shows that an increase in the content results degradation of crystalline quality. Samples at 400 °C possess true dielectric behavior quite low losses leakage current is negligible. For ScAlN samples 800 °C, crystal structure poor high....
MXenes are a rapidly growing family of 2D materials that exhibit highly versatile structure and composition, allowing for significant tuning the properties. These properties are, however, ultimately limited by surface terminations, which typically mixture species, including F O inherent to MXene processing. Other robust terminations lacking. Here, we apply high-resolution scanning transmission electron microscopy (STEM), corresponding image simulations first-principles calculations...
Refractory transition-metal diborides (TMB2) are candidates for extreme environments due to melting points above 3000 °C, excellent hardness, good chemical stability, and thermal electrical conductivity. However, they typically suffer from rapid high-temperature oxidation. Here, we study the effect of Al addition on oxidation properties sputter-deposited TiB2-rich Ti1-xAlxBy thin films demonstrate that alloying with significantly increases resistance a slight decrease in hardness. TiB2.4...
All atomically laminated MAB phases (M = transition metal, A A-group element, and B boron) exhibit orthorhombic or tetragonal symmetry, with the only exception being hexagonal Ti2InB2. Inspired by recent discovery of chemically ordered carbides, i-MAX phases, we perform an extensive first-principles study to explore chemical ordering upon metal alloying M2AlB2 from groups 3 9) in symmetry. Fifteen stable novel in-plane are identified, coined i-MAB, along 16 disordered alloys. The predictions...
In the present communication, atomic structure and coordination of surface adsorbed species on Nb2C MXene is investigated over time. particular, influence Nb adatoms structural stability oxidation behavior addressed. This investigation based plane-view geometry observations single sheets by a combination atomic-resolution scanning transmission electron microscopy (STEM), energy loss spectroscopy (EELS) STEM image simulations.
This review celebrates the width and depth of electron microscopy methods how these have enabled massive research efforts on MXenes. MXenes constitute a powerful recent addition to 2-dimensional materials, derived from their parent family nanolaminated materials known as MAX phases. Owing rich chemistry, exhibit properties that revolutionized ranges applications, including energy storage, electromagnetic interference shielding, water filtering, sensors, catalysis. Few other been more...
The development of abundant, cheap, and highly active catalysts for the hydrogen evolution reaction (HER) oxygen (OER) is important production. Nanolaminate ternary transition metal carbides (MAX phases) their derived two-dimensional (MXenes) have attracted considerable interest electrocatalyst applications. Herein, four new MAX@MXene core-shell structures (Ta2CoC@Ta2CTx, Ta2NiC@Ta2CTx, Nb2CoC@Nb2CTx, Nb2NiC@Nb2CTx), in which core region Co/Ni-MAX phases while edge MXenes, been prepared....
Abstract In this study, a simple thermal reduction process is used to synthesize rGO-Ca 2 Fe O 5 (rGO-CFO) nanocomposite, with the morphological and optical characteristics of CFO nanomaterial being modified by rGO incorporation. The interface between nanosheets nanoparticles facilitates efficient charge separation resulting transfer photogenerated carriers across nanosheets, demonstrated from photoluminescence Mott-Schottky tests. Compared (2.1 eV), rGO-CFO has reduced band gap energy 1.9...
We report the synthesis and characterization of a new laminated i-MAX phase, (V2/3Sc1/3)2AlC, with in-plane chemical ordering between M-elements. also present evidence for solid solution (V2-xScx)2AlC, where x ≤ 0.05. Chemical etching Al Sc results in two-dimensional (2D) MXene counterpart: V2-xC from latter phase. Furthermore, HF yields single-sheet flat morphology, while LiF + HCl gives scrolls. show 4× reduction time (V2-xScx)2AlC compared to V2AlC, suggesting that traces changes phase...
Composites of biopolymers and conducting polymers are emerging as promising candidates for a green technological future actively being explored in various applications, such energy storage, bioelectronics, thermoelectrics. While the device characteristics these composites have been investigated, there is limited knowledge concerning fundamental intracomponent interactions modes molecular structuring. Here, by use cellulose poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS),...
TiBx thin films with a B content of 1.43 ≤ x 2.70 were synthesized using high-power impulse magnetron sputtering (HiPIMS) and direct-current (DCMS). HiPIMS allows compositions ranging from understoichiometric to overstoichiometric dense B/Ti ratio between 2.06, while DCMS yields 2.20 2.70. Excess in results hardness up 37.7 ± 0.8 GPa, attributed the formation an amorphous B-rich tissue phase interlacing stoichiometric TiB2 columnar structures. We furthermore show that TiB1.43 by HiPIMS,...
We systematically study the oxidation properties of sputter-deposited TiB2.5 coatings up to 700 °C. Oxide-scale thickness dox increases linearly with time ta for 300, 400, 500, and °C, while an oxidation-protective behavior occurs dox=250∙ta0.2 at 600 Oxide-layer's structure changes from amorphous rutile/anatase-TiO2 temperatures ≥ 500 Abnormally low rate °C is attributed a highly dense columnar TiO2-sublayer growing near oxide/film interface top-amorphous thin layer, suppressing oxygen...
Metastable Cr 2 C was formed upon Al extraction from AlC MAX phase thin films using Cu as a getter material.