Mo<sub>2</sub>Ga<sub>2</sub>C: a new ternary nanolaminated carbide

Hu, Cong; Lai, Chung-Chuan; Tao, Quanzheng; Lu, Jun; Halim, Joseph; Sun, Liangbo; Zhang, J.; Yang, Jun; Anasori, Babak; Wang, J.; Sakka, Yoshio; Hultman, Lars; Eklund, Per; Rosén, Johanna; Barsoum, Michel W.

doi:10.1039/c5cc00980d

Cited by 163 publications

(140 citation statements)

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Section: A New Two-dimensional Zirconium Carbide Mxene By Selective Ementioning

confidence: 99%

“…Moreover, Mo2CTz MXene [29] has been synthesized through selective etching of gallium (Ga) from a thin film of the new ternary nanolaminated Mo2Ga2C. [30][31] Besides, large-area high-quality 2D α-Mo2C, WC, and TaC crystals have been fabricated by a chemical vapour deposition (CVD) process.[32] However, potential MXene compounds in materials systems where Al-containing MAX phases are not established, such as Hf2C and Zr2C, are yet to be produced.Herein, for the first time, we report the preparation of Zr-containing 2D carbide based on selective extraction of Al-C units from an alternative layered ternary Zr3Al3C5, benefiting from the relatively weakly bonded and hydrolysis-prone Al-C layers in the Zr3Al3C5 crystal structure. Zr3Al3C5 is a typical member of the layered ternary and quaternary transition-metal carbides beyond MAX phases; holding a common formula of MnAl3C2 and Mn [Al(Si)]4C3 (where M= Zr or Hf, n = 1-3).…”

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confidence: 99%

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A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅

et al. 2016

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During the past decade, two-dimensional (2D) materials have attracted extensive attention due to their high surface area to volume ratio, unique electronic structures and physiochemical properties derived from their low dimensionality. [1][2][3][4][5][6][7] Graphene, the most studied 2D material with ultrahigh mechanical strength, [8][9] excellent electronic and thermal conductivities, [1,[10][11] exhibits potential applications in electrochemical energy storage, transparent electrodes, and nano-composites. [12] However, due to its intrinsic zero bandgap and simple chemistry, applications of graphene are restricted in some aspects, such as field effect transistors.[10] Thus, investigations on other 2D materials are performed, especially for those 2D materials with two or more composition elements, such as metal oxide, layered metal chalcogenides (LMDCs), hexagonal boron nitride(BN), hydroxides, etc. [6,13] In recent years, a new class of 2D materials called MXenes, have emerged [14] Members in this family are described by the general formula of Mn+1XnTz (wherein M is an early transition metal, X is C and/or N, n is 1, 2, 3, and Tz denotes surface terminated functional groups). [14] Generally, MXenes are produced by the selective etching of Al layers from their parental layered ternary MAX phases, a large group which comprises more than 70 members. [15][16] Through selective etching of aluminium layers, experimental investigations have successfully identified about 10 different MXenes, Ti3C2Tz, Ti2CTz, Ta4C3Tz, TiNbCTz, (V0.5,Cr0.5)3C2Tz, Ti3CNTz, Nb2CTz, V2CTz, and Nb4C3Tz. [14,17] Most of the synthesized MXenes are metallic, [18] hydrophilic, and predicted to have high elastic moduli, implying potential application as reinforcement of polymer. [19][20] The existance of Dirac electrons in some MXenes has also been theoretically predicted .[21] Moreover, similar to graphene, MXenes are promising candidate electrode materials for lithium-ion batteries and supercapacitors by facile intercalation of Li ions into the MXene layers. [22][23][24][25][26][27] Recently, considerable efforts have been made to further expand the family of 2D carbides. On the basis of a substitutional solid solution method, Gogotsi and Barsoum et al. [28] successfully synthesized Mo2TiC2Tz, Mo2Ti2C3Tz, and Cr2TiC2TzMXenes, and surface dependent electrochemical behaviors in the case of Mo2TiC2Tz have been revealed. Moreover, Mo2CTz MXene [29] has been synthesized through selective etching of gallium (Ga) from a thin film of the new ternary nanolaminated Mo2Ga2C. [30][31] Besides, large-area high-quality 2D α-Mo2C, WC, and TaC crystals have been fabricated by a chemical vapour deposition (CVD) process.[32] However, potential MXene compounds in materials systems where Al-containing MAX phases are not established, such as Hf2C and Zr2C, are yet to be produced.Herein, for the first time, we report the preparation of Zr-containing 2D carbide based on selective extraction of Al-C units from an alternative layered ternary Zr3Al3C5, benefiting from ...

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Section: A New Two-dimensional Zirconium Carbide Mxene By Selective Ementioning

confidence: 99%

mentioning

confidence: 99%

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅

et al. 2016

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“…The Mo2C compound was generated through selective etching of gallium (Ga) from a thin film of the new ternary nanolaminated MAX phase related material Mo2Ga2C [13]. The produced MXene material was characterized using X-ray diffraction (XRD), (scanning) transmission electron microscopy ((S)TEM), and energy dispersive X-ray spectroscopy (EDX).…”

mentioning

confidence: 99%

“…Optimization of the Mo2Ga2C thin film deposition was performed in line with previous work [13,15]. The overall composition of resulting samples, determined through elastic recoil detection analysis (ERDA), was 39, 43, and 18 at% of Mo, Ga, and C, respectively [13], with a structural analysis showing primarily Mo2Ga2C, although with some intergrown layers of Mo2GaC [13]. Selective etching of the Ga layers was carried out by immersing the thin films in 50% concentrated hydrofluoric acid (HF(aq)) for 3 h at a temperature of 50 ºC.…”

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confidence: 99%

Synthesis of two-dimensional molybdenum carbide, Mo 2 C, from the gallium based atomic laminate Mo 2 Ga 2 C

et al. 2015

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“…19 When solid solutions are taken into account, the situation is not very different. For instance, Al-containing Ti/V and Ti/Nb solid solutions exist, 20 but these do not add any new elements to those already known to bond to Al.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Anasori

Dahlqvist

Halim

et al. 2015

Journal of Applied Physics

247

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Herein, we report on the phase stabilities and crystal structures of two newly discovered ordered, quaternary MAX phases-Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 -synthesized by mixing and heating different elemental powder mixtures of mMo:(3-m)Ti:1.1Al:2C with 1.5 m 2.2 and 2Mo: 2Ti:1.1Al:2.7C to 1600 C for 4 h under Ar flow. In general, for m ! 2 an ordered 312 phase, (Mo 2 Ti)AlC 2 , was the majority phase; for m < 2, an ordered 413 phase (Mo 2 Ti 2 )AlC 3 , was the major product. The actual chemistries determined from X-ray photoelectron spectroscopy (XPS) are Mo 2 TiAlC 1.7 and Mo 2 Ti 1.9 Al 0.9 C 2.5 , respectively. High resolution scanning transmission microscopy, XPS and Rietveld analysis of powder X-ray diffraction confirmed the general ordered stacking sequence to be Mo-Ti-Mo-Al-Mo-Ti-Mo for Mo 2 TiAlC 2 and Mo-Ti-Ti-Mo-Al-Mo-Ti-TiMo for Mo 2 Ti 2 AlC 3 , with the carbon atoms occupying the octahedral sites between the transition metal layers. Consistent with the experimental results, the theoretical calculations clearly show that M layer ordering is mostly driven by the high penalty paid in energy by having the Mo atoms surrounded by C in a face-centered configuration, i.e., in the center of the M nþ1 X n blocks. At 331 GPa and 367 GPa, respectively, the Young's moduli of the ordered Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 are predicted to be higher than those calculated for their ternary end members. Like most other MAX phases, because of the high density of states at the Fermi level, the resistivity measurement over 300 to 10 K for both phases showed metallic behavior. V C 2015 AIP Publishing LLC.

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Mo₂Ga₂C: a new ternary nanolaminated carbide

Abstract: We report the discovery of a new hexagonal Mo2Ga2C phase, wherein two Ga layersinstead of one -are stacked in a simple hexagonal arrangement in between Mo2C layers. It is reasonable to assume this compound is the first of a larger family.

Cited by 163 publications

References 11 publications

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅

Synthesis of two-dimensional molybdenum carbide, Mo 2 C, from the gallium based atomic laminate Mo 2 Ga 2 C

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

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Mo2Ga2C: a new ternary nanolaminated carbide

Abstract: We report the discovery of a new hexagonal Mo2Ga2C phase, wherein two Ga layersinstead of one -are stacked in a simple hexagonal arrangement in between Mo2C layers. It is reasonable to assume this compound is the first of a larger family.

Cited by 163 publications

References 11 publications

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al3C3 from Nanolaminated Zr3Al3C5

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al3C3 from Nanolaminated Zr3Al3C5

Synthesis of two-dimensional molybdenum carbide, Mo 2 C, from the gallium based atomic laminate Mo 2 Ga 2 C

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

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Mo₂Ga₂C: a new ternary nanolaminated carbide

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅

A Two‐Dimensional Zirconium Carbide by Selective Etching of Al₃C₃ from Nanolaminated Zr₃Al₃C₅