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Wafer-scale MOCv. growth of monolayer M0S2 on sapphire and SiO2

Nano Research 2019年第10期12卷 2646-2652页

作者： Huanyao Cun Michal Macha HoKwon Kim Ke Liu Yanfei Zhao Thomas Lagrange Andras Kis Aleksa ndra Radeno v.c Laboratory of Nanoscale Biology Institute of BioengineeringEcole Polytechnique Federate de Lausanne(EPFL)1015 LausanneSwitzerland Nanoscale Electronics and Structures Electrical Engineering InstituteEcole Poly technique Federate de Lausanne(EPFL)1015 LausanneSwitzerland Nanoscale Electronics and Structures Institute of Materials Science and EngineeringEcole Poly technique Federate de Lausanne(EPFL)1015 LausanneSwitzerland Interdisciplinary Center for Electron Microscopy(CIME) Ecole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland

High-quality and large-scale growth of monolayer molybdenum disulfide(MoS2)has caught intensiv. attention because of its potential in many applications due to unique electronic ***,we report the wafer-scale growth of high-quality mono layer MoS2 on singlecrystalline sapphire and also on SiO2 substrates by a facile metal-organic chemical v.por deposit!on(MOCv.)*** to growth,an aqueous solution of sodium molybdate(Na2MoO4)is spun onto the substrates as the molybdenum precursor and diethyl sulfide((C2H5)2S)is used as the sulfur precursor duri ng the *** grown MoS2 films exhibit crystal I i nity,good electrical performa nee(electro n mobility of 22 cm2·v.-1·s^-1)and structural continuity maintained ov.r the entire *** sapphire substrates are reusable for subsequent *** same method is applied for the synthesis of tungsten disulfide(WS2).Our work prov.des a facile,reproducible and cost-efficient method for the scalable fabricati on of high-quality mono layer MoS2 for v.rsatile applicati ons,such as electro nic and optoelectr onic dev.ces as well as the membranes for desalination and power generation.

关键词： molybdenum disulfide two-dimensional(2D)materials metal-organic chemical v.por deposition(MOCv.) wafer-scale fabrication

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Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-driv. implosions using x-ray self-emission shadowgraphy

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High Power Laser Science and Engineering 2015年第3期3卷 20-27页

作者： D.T.Michel A.K.Dav.s W.Armstrong R.Bahr R.Epstein v.N.goncharov.M.Hohenberger I.v.Igumenshchev.R.Jungquist D.D.Meyerhofer P.B.Radha T.C.Sangster C.Sorce D.H.Froula Laboratory for Laser Energetics University of Rochester

Self-emission x-ray shadowgraphy prov.des a method to measure the ablation-front trajectory and low-mode nonuniformity of a target imploded by directly illuminating a fusion capsule with laser beams. The technique uses time-resolv.d images of soft x-rays(>1 ke v. emitted from the coronal plasma of the target imaged onto an x-ray framing camera to determine the position of the ablation front. Methods used to accurately measure the ablation-front radius(δ R= ±1.15 μm), image-to-image timing(δ( t)= ±2.5 ps) and absolute timing(δt= ±10 ps) are *** av.raging of the images prov.des an av.rage radius measurement of δ( rav)= ±0.15 μm and an error in v.locity of δv./ v. ±3%. This technique was applied on the Omega Laser Facility [Boehly et al., Opt. Commun. 133, 495(1997)] and the National Ignition Facility [Campbell and Hogan, Plasma Phys. Control. Fusion 41, B39(1999)].

关键词： low mode nonuiformity nuclear fusion self-emission shadowgraphy shell trajectory

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