Search results for: Michel W. Barsoum

Items from 1 to 20 out of 107 results

article

Ultrafast Spectroscopy of Plasmons and Free Carriers in 2D MXenes

Erika Colin‐Ulloa, Andrew Fitzgerald, Kiana Montazeri, Javery Mann, more

2D MXenes have diverse and chemically tunable optical properties that arise from an interplay between free carriers, interband transitions, and plasmon resonances. The nature of photoexcitations and their dynamics in three different members of the MXene family, Ti₃C₂, Mo₂Ti₂C₃, and Nb₂C, are investigated using two complementary pump‐probe techniques, transient optical absorption, and time‐resolved...

article

Ultra‐High Speed, High‐Sensitivity Spin‐Cast MXene‐Semiconductor‐MXene Photodetectors

Kiana Montazeri, Marc Currie, Michel W Barsoum, Bahram Nabet

Advanced Functional Materials > 32 > 51 > n/a - n/a

A simple room‐temperature process of depositing MXene on a III‐V structure with embedded 2D electron gas (2DEG) is used, which results in a large area,

2 \times 10^{4} µ m^{2}

, photodetector (PD) device that greatly outperforms vacuum deposited Ti/Au metal‐semiconductor‐metal (MSM) PD's. By co‐optimizing properties of 2D MXene contacts and the III‐V material heterojunctions, this device...

article

Ten Years of Progress in the Synthesis and Development of MXenes (Adv. Mater. 39/2021)

Michael Naguib, Michel W. Barsoum, Yury Gogotsi

Advanced Materials > 33 > 39 > n/a - n/a

MXenes In article number 2103393, Michael Naguib, Michel W. Barsoum, and Yury Gogotsi present a brief historical overview of the first 10 years of MXene research and a perspective on their synthesis and future development. The cover shows a colored SEM image of a multilayer Ti₃C₂ MXene particle with an accordion‐like morphology, which is produced by individual MXene layers stacked together. The variety...

article

Ten Years of Progress in the Synthesis and Development of MXenes

Michael Naguib, Michel W. Barsoum, Yury Gogotsi

Advanced Materials > 33 > 39 > n/a - n/a

Since their discovery in 2011, the number of 2D transition metal carbides and nitrides (MXenes) has steadily increased. Currently more than 40 MXene compositions exist. The ultimate number is far greater and in time they may develop into the largest family of 2D materials known. MXenes’ unique properties, such as their metal‐like electrical conductivity reaching ≈20 000 S cm⁻¹, render them quite useful...

article

Thermal stability of the nanolayered Fe₂AlB₂ in nitrogen and argon atmospheres

Sankalp Kota, Louisiane Verger, Varun Natu, Maxim Sokol, more

Journal of the American Ceramic Society > 104 > 2 > 733 - 739

The thermal stability and decomposition mechanisms of Fe₂AlB₂ powders, synthesized by reactive powder metallurgy, were studied under nitrogen (N₂) or argon (Ar) atmospheres. The effects of using different FeB precursors to synthesize the Fe₂AlB₂ and hydrochloric acid (HCl) purification treatments on the thermal stability were also investigated. When as‐synthesized Fe₂AlB₂ powders are treated in dilute...

article

Mechanical Exfoliation of Select MAX Phases and Mo₄Ce₄Al₇C₃ Single Crystals to Produce MAXenes

Athanasios Gkountaras, Youngsoo Kim, Johann Coraux, Vincent Bouchiat, more

Small > 16 > 4 > n/a - n/a

MXenes—2D carbides/nitrides derived from their bulk nanolamellar M_n₊₁AX_n phase (MAX) counterparts—are, for the most part, obtained by chemical etching. Despite the fact that the MA bonds in the MAX phases are not weak, in this work it is demonstrated that relatively large MAX single crystals can be mechanically exfoliated using the adhesive tape method to produce flakes whose thickness can be reduced...

article

Beyond Gold: Spin‐Coated Ti₃C₂‐Based MXene Photodetectors

Kiana Montazeri, Marc Currie, Louisiane Verger, Pouya Dianat, more

Advanced Materials > 31 > 43 > n/a - n/a

2D transition metal carbides, known as MXenes, are transparent when the samples are thin enough. They are also excellent electrical conductors with metal‐like carrier concentrations. Herein, these characteristics are exploited to replace gold (Au) in GaAs photodetectors. By simply spin‐coating transparent Ti₃C₂‐based MXene electrodes from aqueous suspensions onto GaAs patterned with a photoresist...

article

Mxene Photodetectors: Beyond Gold: Spin‐Coated Ti₃C₂‐Based MXene Photodetectors (Adv. Mater. 43/2019)

Kiana Montazeri, Marc Currie, Louisiane Verger, Pouya Dianat, more

Advanced Materials > 31 > 43 > n/a - n/a

“As good as gold” is a seldom true adage, but in article number 1903271, Bahram Nabet and co‐workers show that using a Ti₃C₂Tz (MXene) aqueous suspension, a table‐top spinner, and acetone, GaAs photodetectors that outperform conventional ones using Ti/Au can be fabricated. This ambient condition process is promising for integration into microelectronics, photonic integrated circuits, and silicon photonics...

article

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

Varun Natu, James L. Hart, Maxim Sokol, Helen Chiang, more

Angewandte Chemie > 131 > 36 > 12785 - 12790

MXenes have shown promise in myriad applications, such as energy storage, catalysis, EMI shielding, among many others. However, MXene oxidation in aqueous colloidal suspensions when stored in water at ambient conditions remains a challenge. It is now shown that by simply capping the edges of individual MXene flakes, Ti₃C₂T_z and V₂CT_z, by polyanions such as polyphosphates, polysilicates or polyborates,...

article

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

Varun Natu, James L. Hart, Maxim Sokol, Helen Chiang, more

Angewandte Chemie International Edition > 58 > 36 > 12655 - 12660

article

Tuning Thermal Transport Through Atomically Thin Ti₃C₂T_z MXene by Current Annealing in Vacuum

Zahra Hemmat, Poya Yasaei, Jeremy F. Schultz, Liang Hong, more

Advanced Functional Materials > 29 > 19 > n/a - n/a

Heat transport across vertical interfaces of heterogeneous 2D materials is usually governed by the weak Van der Waals interactions of the surface‐terminating atoms. Such interactions play a significant role in thermal transport across transition metal carbide and nitride (MXene) atomic layers due to their hydrophilic nature and variations in surface terminations. Here, the metallicity of atomically...

article

Enhanced Thermal Boundary Conductance in Few‐Layer Ti₃C₂ MXene with Encapsulation

Poya Yasaei, Zahra Hemmat, Cameron J. Foss, Shixuan Justin Li, more

Advanced Materials > 30 > 43 > n/a - n/a

Van der Waals interactions in 2D materials have enabled the realization of nanoelectronics with high‐density vertical integration. Yet, poor energy transport through such 2D–2D and 2D–3D interfaces can limit a device's performance due to overheating. One long‐standing question in the field is how different encapsulating layers (e.g., contact metals or gate oxides) contribute to the thermal transport...

article

W‐Based Atomic Laminates and Their 2D Derivative W_1.33C MXene with Vacancy Ordering

Rahele Meshkian, Martin Dahlqvist, Jun Lu, Björn Wickman, more

Advanced Materials > 30 > 21 > n/a - n/a

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 of quaternary i‐MAX phases with in‐plane chemical order and a general chemistry (W_2/3M²_1/3)₂AC, where M² = Sc, Y (W), and A = Al, Si, Ga, Ge, In, and Sn. Of over 18 compositions probed, only two—with a monoclinic C2/c structure—are...

article

Tailoring Structure, Composition, and Energy Storage Properties of MXenes from Selective Etching of In‐Plane, Chemically Ordered MAX Phases

Ingemar Persson, Ahmed el Ghazaly, Quanzheng Tao, Joseph Halim, more

Small > 14 > 17 > n/a - n/a

The exploration of 2D solids is one of our time's generators of materials discoveries. A recent addition to the 2D world is MXenes that possses a rich chemistry due to the large parent family of MAX phases. Recently, a new type of atomic laminated phases (coined i‐MAX) is reported, in which two different transition metal atoms are ordered in the basal planes. Herein, these i‐MAX phases are used in...

article

The Ti₃AlC₂ MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

Wesley H. K. Ng, Edwin S. Gnanakumar, Erdni Batyrev, Sandeep K. Sharma, more

Angewandte Chemie > 130 > 6 > 1501 - 1506

Dehydrogenation or oxidative dehydrogenation (ODH) of alkanes to produce alkenes directly from natural gas/shale gas is gaining in importance. Ti₃AlC₂, a MAX phase, which hitherto had not been used in catalysis, efficiently catalyzes the ODH of n‐butane to butenes and butadiene, which are important intermediates for the synthesis of polymers and other compounds. The catalyst, which combines both metallic...

article

The Ti₃AlC₂ MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

Wesley H. K. Ng, Edwin S. Gnanakumar, Erdni Batyrev, Sandeep K. Sharma, more

Angewandte Chemie International Edition > 57 > 6 > 1485 - 1490

article

The {110} reflection in X‐ray diffraction of MXene films: Misinterpretation and measurement via non‐standard orientation

Michael Ghidiu, Michel W. Barsoum

Journal of the American Ceramic Society > 100 > 12 > 5395 - 5399

It has been claimed that disappearance of the {110} reflection in powder X‐ray diffraction of MXene films and powders is indicative of shearing or general disorder of restacking of the flakes. Here we show this to be incorrect and provide experimental justification. The disappearance of this peak arises from a combination of sample texture and orientation. Furthermore, our methods provide a simple...

article

Synthesis and characterization of the mechanical properties of Ti3SiC2/Mg and Cr2AlC/Mg alloy composites

Matt Nelson, Matthias T. Agne, Babak Anasori, Jian Yang, more

Materials Science and Engineering: A > 2017 > 705 > C > 182-188

Herein we report on the fabrication and characterization of Mg and Mg-alloy metal matrix composites (MMCs) reinforced with the MAX phases, Ti₃SiC₂ and Cr₂AlC. Pure Mg and Al-containing Mg-alloys with varying Al content (AZ31, AZ61 & AZ91), were pressureless melt infiltrated into 55±1vol% porous MAX preforms. The resulting microstructures and mechanical properties were characterized by X-ray diffraction,...

article

Preparation and characterization of polymer‐Ti₃C₂T_x (MXene) composite nanofibers produced via electrospinning

Elisa A. Mayerberger, Olga Urbanek, Riki M. McDaniel, Reva M. Street, more

Journal of Applied Polymer Science > 134 > 37 > n/a - n/a

MXene, a recently‐discovered family of two‐dimensional (2D) transition metal carbides and/or nitrides, have attracted much interest because of their unique electrical, thermal, and mechanical properties. In this study, poly(acrylic acid), poly(ethylene oxide) (PEO), poly(vinyl alcohol) (PVA), and alginate/PEO were electrospun with delaminated Ti₃C₂ (MXene) flakes. The effect of small additions of...

article

Effects of neutron irradiation of Ti3SiC2 and Ti3AlC2 in the 121–1085 °C temperature range

Darin J. Tallman, Lingfeng He, Jian Gan, El'ad N. Caspi, more

Journal of Nuclear Materials > 2017 > 484 > C > 120-134

Herein we report on the formation of defects in response to neutron irradiation of polycrystalline Ti₃SiC₂ and Ti₃AlC₂ samples exposed to total fluences of ≈6 × 10²⁰ n/m², 5 × 10²¹ n/m² and 1.7 × 10²² n/m² at irradiation temperatures of 121(12), 735(6) and 1085(68)°C. These fluences correspond to 0.14, 1.6 and 3.4 dpa, respectively. After irradiation to 0.14 dpa at 121 °C and 735 °C, black spots are...

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Search results for: Michel W. Barsoum

Ultrafast Spectroscopy of Plasmons and Free Carriers in 2D MXenes

Ultra‐High Speed, High‐Sensitivity Spin‐Cast MXene‐Semiconductor‐MXene Photodetectors

Ten Years of Progress in the Synthesis and Development of MXenes (Adv. Mater. 39/2021)

Ten Years of Progress in the Synthesis and Development of MXenes

Thermal stability of the nanolayered Fe₂AlB₂ in nitrogen and argon atmospheres

Mechanical Exfoliation of Select MAX Phases and Mo₄Ce₄Al₇C₃ Single Crystals to Produce MAXenes

Beyond Gold: Spin‐Coated Ti₃C₂‐Based MXene Photodetectors

Mxene Photodetectors: Beyond Gold: Spin‐Coated Ti₃C₂‐Based MXene Photodetectors (Adv. Mater. 43/2019)

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

Tuning Thermal Transport Through Atomically Thin Ti₃C₂T_z MXene by Current Annealing in Vacuum

Enhanced Thermal Boundary Conductance in Few‐Layer Ti₃C₂ MXene with Encapsulation

W‐Based Atomic Laminates and Their 2D Derivative W_1.33C MXene with Vacancy Ordering

Tailoring Structure, Composition, and Energy Storage Properties of MXenes from Selective Etching of In‐Plane, Chemically Ordered MAX Phases

The Ti₃AlC₂ MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

The Ti₃AlC₂ MAX Phase as an Efficient Catalyst for Oxidative Dehydrogenation of n‐Butane

The {110} reflection in X‐ray diffraction of MXene films: Misinterpretation and measurement via non‐standard orientation

Synthesis and characterization of the mechanical properties of Ti3SiC2/Mg and Cr2AlC/Mg alloy composites

Preparation and characterization of polymer‐Ti₃C₂T_x (MXene) composite nanofibers produced via electrospinning

Effects of neutron irradiation of Ti3SiC2 and Ti3AlC2 in the 121–1085 °C temperature range

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