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Hole-doping induced ferromagnetism in 2D materials

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npj Computational materials 2022年第1期8卷 2180-2189页

作者： Ruishen meng Lino da Costa Pereira jean-Pierre Locquet Valeri Afanas’ev Geoffrey Pourtois michel Houssa Department of Physics and Astronomy KU LeuvenCelestijnenlaan 200DLeuvenB-3001Belgium imec Kapeldreef 75B-3001LeuvenBelgium

Two-dimensional(2D)ferromagnetic materials are considered as promising candidates for the future generations of spintronic ***,2D materials with intrinsic ferromagnetism are ***,high-throughput first-principles simulations are performed to screen 2D materials that present a non-magnetic to a ferromagnetic transition upon hole doping.A global evolutionary search is subsequently performed to identify alternative possible atomic structures of the eligible candidates,and 122 materials exhibiting a hole-doping induced ferromagnetism are *** energetic and dynamic stability,as well as magnetic properties under hole doping are investigated *** of these 2D materials are metal halides,followed by chalcogenides,oxides,and nitrides,some of them having predicted Curie temperatures above 300 *** exchange interactions responsible for the ferromagnetic order are also *** work not only provides theoretical insights into hole-doped 2D ferromagnetic materials,but also enriches the family of 2D magnetic materials for possible spintronic applications.

关键词： ferromagnetic doping materials

The secret language of flowers

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The secret language of flowers

Effect of cleanup of spiked sludge on corn growth biosorption and metal leaching

作者： jean-michel Othoniel.

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Emerging Contaminants 2021年第1期7卷 77-87页

作者： Driss Barraoui jean-François Blais michel Labrecque Institut National de La Recherche Scientifique(INRS-ETE) Universite Du Quebec490Rue de La CouronneQuebecQuebecG1K 9A9Canada Institut de Recherche en Biologie Vegetale(IRBV) 4101Rue Sherbrooke EstMontrealQuebecH1X 2B2Canada

A chemical leaching process was used for the cleanup of two municipal biosolids(mOS and BES)spiked with Cd,Cu,Zn or their mixture prior to agricultural ***-cleaned,cleaned and washed biosolids were compared as soil amendments for corn cultivation in *** growth,biosorption and metal leaching were *** showed that biosolid amendments tend to produce more aerial *** and washing of BES biosolid significantly increased total biomass of roots and stalks,*** biosorption of metals,Cd accumulated in roots(0.06e1.13 mg kg^(-1))and leaves(0.06-0.63 mg kg^(-1)),but not in seeds nor in *** amounts of Cu were detected in roots(10.7-18.2 mg kg^(-1)),stalks(1.29-3.78 mg kg^(-1))and leaves(6.77-20.2 mg kg^(-1)).However,Zn was more accumulated in roots(17.9-74.9 mg kg^(-1)),stalks(6.15-17.1 mg kg^(-1))and leaves(47.9-90.1 mg kg^(-1)).Whereas Cd and Cu decreased in the order roots>leaves>stalks,Zn decreased from leaves>roots>*** and washing of mOS and BES biosolids significantly lowered biosorption of Cd(up to 84%),Cu(up to 38%),Zn(up to 63%),and other *** in leachate draining into outlet water varied over time,but on average were moderately *** amounts of metal leached from mOS *** effects of cleanup and washing of both biosolids on biosorption and leaching depended on the initial metallic charge and the biosolid type.

关键词： Sludge Biosolid Cleanup metal Leaching Corn

A quantum cascade laser infrared spectrometer for CO_2 stable isotope analysis：Field implementation at a hydrocarbon contaminated site under bio-remediation

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Journal of Environmental Sciences 2016年第2期28卷 60-74页

作者： Christophe Guimbaud Cécile Noel michel Chartier Valéry Catoire michaela Blessing jean Christophe Gourry Claude Robert Laboratoire de Physique et de Chimie de l'Environnement et de l'Espace (LPC2E) CNRS et Universite d'Orleans (UMR 7328)45071 Orleans cedex 2 France Bureau de Recherches Geologiques et minieres (BRGm) 45060 Orleans cedex 2 France

Real-time methods to monitor stable isotope ratios of CO_2 are needed to identify biogeochemical origins of CO_2 emissions from the soil–air interface. An isotope ratio infra-red spectrometer（IRIS） has been developed to measure CO_2 mixing ratio with δ~13C isotopic signature, in addition to mixing ratios of other greenhouse gases（CH_4, N2_O）. The original aspects of the instrument as well as its precision and accuracy for the determination of the isotopic signature δ~13C of CO_2 are discussed. A first application to biodegradation of hydrocarbons is presented, tested on a hydrocarbon contaminated site under aerobic bio-treatment. CO_2 flux measurements using closed chamber method is combined with the determination of the isotopic signature δ~13C of the CO_2 emission to propose a non-intrusive method to monitor in situ biodegradation of hydrocarbons. In the contaminated area, high CO_2 emissions have been measured with an isotopic signature δ~13C suggesting that CO_2 comes from petroleum hydrocarbon *** first field implementation shows that rapid and accurate measurement of isotopic signature of CO_2 emissions is particularly useful in assessing the contribution of contaminant degradation to the measured CO_2 efflux and is promising as a monitoring tool for aerobic bio-treatment.

关键词： Isotope ratio infrared spectrometry Isotopic signature δ^(13)C of CO_2 Biodegradation monitoring Hydrocarbons BTEX

National Soil Organic Carbon Stocks Inventories under Different mangrove Forest Types in Gabon

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mechanism of superlubricity of a DLC/Si_(3)N_(4) contact in the presence of castor oil and other green lubricants

Open Journal of Forestry（林学期刊） 2024年第2期 127页

作者： Rolf Gaël mabicka Obame Neil-Yohan musadji jean Hervé mve Beh Lydie-Stella Koutika jean Aubin Ondo Farrel Nzigou Boucka michel mbina mounguengui Claude Geffroy

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Friction 2022年第10期10卷 1693-1706页

作者： Yun LONG Yang WANG Volker WEIHNACHT Stefan mAKOWSKI momoji KUBO jean michel mARTIN maria-Isabel DE BARROS BOUCHET Ecole Centrale de Lyon Laboratory of Tribology and System DynamicsUniversity of LyonEcully 69134France Institute for materials Research Tohoku UniversitySendai 980-8577Japan Department of mechanical Systems Engineering Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan Fraunhofer Institute for material and Beam Technology(IWS) Dresden 01277Germany

To meet the surging needs in energy efficiency and eco-friendly lubricants,a novel superlubricious technology using a vegetable oil and ceramic materials is *** coupling different hydrogen-free amorphous carbon coatings with varying fraction of sp^(2) and sp^(3) hybridized carbon in presence of a commercially available silicon nitride bulk ceramic,castor oil provides superlubricity although the liquid vegetable oil film in the contact is only a few nanometres thick at *** a partial liquid film possibly separating surfaces in contact,local tribochemical reactions between asperities are essential to maintain superlubricity at low *** local pressure activates chemical degradation of castor oil generating graphitic/graphenic-like species on top of asperities,thus helping both the chemical polishing of surface and its chemical passivation by H and OH ***,the formation of the formation of–(CH_(2)–CH_(2))n–noligomers have been evidenced to have a major role in the friction *** simulation unveils that formation of chemical degradation products of castor oil on friction surfaces are favoured by the quantity of sp^(2)-hybridized carbon atoms in the amorphous carbon ***,tuning sp^(2)-carbon content in hydrogen-free amorphous carbon,in particular,on the top layers of the coating,provides an alternative way to control superlubricity achieved with castor oil and other selected green lubricants.

关键词： superlubricity diamond-like carbon(DLC) sp^(2)-hybridized carbon hydrogen passivation castor oil

Highly defective graphene： A key prototype of two- dimensional Anderson insulators

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Nano Research 2013年第5期6卷 326-334页

作者： Aurelien Lherbier Stephan Roche Oscar A. Restrepo Yann-michel Niquet Arnaud Delcorte jean-Christophe Charlier Universite catholique de Louvain (UCL) Institute of Condensed Matter and Nanoscience (IMCN) NAPS-ETSF Chemin des ~toiles 8 1348 Louvain-la-Neuve Belgium CIN2 (ICN-CSIC) and Universitat Autonoma de Barcelona Catalan Institute of Nanotechnology Campus UAB 08193 Bellaterra (Barcelona) Spain ICREA Institucio Catalana de Recerca i Estudis Avancats 08070 Barcelona Spain Universite catholique de Louvain (UCL) Institute of Condensed Matter and Nanoscience (IMCN) BSMA Place Croix du Sud 1 (Boltzmann) 1348 Louvain-la-Neuve Belgium L_Sim SP2M UMR-E CEA/UJF-Grenoble 1 INAC 17 rue des Martyrs 38054 Grenoble Cedex 9 France

Electronic structure and transport properties of highly defective two-dimensional （2D） sp2 graphene are investigated theoretically. Classical molecular dynamics are used to generate large graphene planes containing a considerable amount of defects. Then, a tight-binding Hamiltonian validated by ab initio calculations is constructed in order to compute quantum transport within a real-space order-N Kubo-Greenwood approach. In contrast to pristine graphene, the highly defective sp2 carbon sheets exhibit a high density of states at the charge neutrality point raising challenging questions concerning the electronic transport of associated charge carriers. The analysis of the electronic wavepacket dynamics actually reveals extremely strong multiple scattering effects giving rise to mean free paths as low as 1 nm and localization phenomena. Consequently, highly defective graphene is envisioned as a remarkable prototype of 2D Anderson insulating materials.

关键词： graphene electronic transport Anderson insulators localization

Petrography of alluvial sands as a past and present environmental indicator:Case of the Loire River(France)

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International Journal of Sediment Research 2013年第3期28卷 285-303页

作者： jean-Jacques mACAIRE Isabelle GAY-OVEJERO michel BACCHI Constantin COCIRTA Luc PATRYL Stéphane RODRIGUES University Franqois-Rabelais of Tours University Francois-Rabelais of Tours SARL RIVE 4. Commissariat a l'Energie Atomique-CEA DAMDIF

Four sample sets of the Upper and middle Loire river sands were analyzed in order to study the impact of natural and anthropogenic factors on their petrographic composition in space(on an 800 km stretch) and *** was determined by modal analysis of three sand-size fractions using a polarizing optical microscope and calculated for each sample("standard sand" = Sst).The watershed is composed mainly of endogenic(massif Central) and sedimentary(southern Parisian Basin) rocks.B-set sands collected in channels for different water flows in 1996 show that Sst compositions vary by only 5%.Present-day sands in the Upper Loire and middle Loire have very high petrographic immaturity comparing to others worldwide fluvial sands,although bio-climatic conditions favor sand maturation by source-rock weathering in the *** shows the strong impact of the massif Central on sediment yield due to relief rejuvenation as a consequence of the formation of the Alps during the *** sands stored during the Weichselian and the Holocene in the middle Loire floodplain,although partly weathered since their deposition,show higher inputs from the endogenic rocks of the massif Central than present-day *** can be explained by Weichselian periglacial conditions and the development of crop farming since the Neolithic,which favored mechanical erosion,particularly in the massif Central which is characterized by a cold,humid climate and steep *** upstream-downstream change in the composition of presently deposited sand is low in the diked *** shows however that basalt and some heavy mineral grains are vulnerable to abrasion during transport and indicates a marked sediment yield from ancient sediment stored in the *** is in line with the high incision of the river bed over the last 150 years partly due to dam construction and aggregate mining.

关键词： Fluvial sand Sand petrography Sediment source Tectonics impact Human impact Loire river

Layer-modulated two-photon absorption in moS2:probing the shift of the excitonic dark state and band-edge

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Photonics Research 2019年第7期7卷 77-85页

作者： Yafeng Xie Saifeng Zhang Yuanxin Li Ningning Dong Xiaoyan Zhang Lei Wang Weimin Liu Ivan m.Kislyakov jean-michel Nunzi Hongji Qi Long Zhang Jun Wang Laboratory of micro-Nano Optoelectronic materials and Devices and CAS Key Laboratory of materials for High-Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Department of Physics Engirteering Physics & Astronomy and Department of ChemistryQueen's University Kingston Ontario K7L-3N6Canada State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800 China

Questions hovering over the modulation of bandgap size and excitonic effect on nonlinear absorption in twodimensional transition metal dichalcogenides (TmDCs) have restricted their application in micro/nano optical modulator, optical switching, and beam shaping devices. Here, degenerate two-photon absorption (TPA) in the near-infrared region was studied experimentally in mechanically exfoliated moS2 from single layer to multilayer. The layer-dependent TPA coefficients were significantly modulated by the detuning of the excitonic dark state (2p). The shift of the quasiparticle bandgap and the decreasing of exciton binding energy with layers were deduced, combined with the non-hydrogen model of excitons in TmDCs and the scaling rule of semiconductors. Our work clearly demonstrates the layer modulation of nonlinear absorption in TmDCs and provides support for layer-dependent nonlinear optical devices, such as optical limiters and optical switches.

关键词： absorption layer-dependent bandgap