2D Materials – Preparation, Properties & Applications: Synthesis, Properties & Applications
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Nuggehalli Ravindra, New Jersey Institute of Technology; Ramana Chintalapalle, University of Texas at El Paso; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Sufian Abedrabbo, Khalifa University; Amber Shrivastava, Indian Institute of Technology Bombay

Wednesday 2:00 PM
March 17, 2021
Room: RM 11
Location: TMS2021 Virtual

Session Chair: Sufian Abedrabbo, Khalifa University; Nuggehalli Ravindra (Ravi), New Jersey Institute of Technology


2:00 PM  Invited
Magnetic and Transport Properties of 2D Layered Chiral Magnets: Junjie Yang1; 1New Jersey Institute of Technology
    Two-dimensional (2D) layered magnets trigger significant research interests due to a set of their unusual low-dimensional properties and potential in technology applications. Two examples are the recently discovered ferromagnetic CrI3 and Cr2Ge2Te6. Among the various 2D layered magnets, 2D chiral magnets that possess chiral lattice structure and magnetic order are rare and unique. Exotic physical phenomena are bound to happen in chiral magnets where all of space inversion, mirror, and timer reversal symmetries are broken. In this talk, we will discuss the single crystal growth, magnetic and transport properties of the 2D chiral magnets M1/3TaS2 (M = Cr, Fe, Co and Ni). We observed exotic chiral magnetic orders and domain structures in M1/3TaS2 single crystals. The emergence of novel magnetism in 2D chiral magnets could open up new opportunities for functional device designs.

2:25 PM  Invited
Elaboration and Characterization of Thin Films of SiP Lamellar Alloys: A First Step towards 2D-SiP: Mathieu Stoffel1; Alix Valdenaire1; Sébastien Geiskopf1; Xavier Devaux1; Erwan André1; Cedric Carteret1; Alexandre Bouché1; Michel Vergnat1; Hervé Rinnert1; 1Universite De Lorraine
     Silicon phosphide (SiP) has gained an increasing interest since an indirect to direct bandgap transition was predicted when moving from the bulk to the corresponding 2D material. While some theoretical works are available on 2D-SiP, there is no report concerning the synthesis of 2D-SiP by using mechanical exfoliation of SiP thin films. In this work, we investigate SiPx thin films prepared by co-evaporation of Si from an e-beam gun and P from a GaP decomposition source. The film properties were investigated by scanning transmission electron microscopy (STEM) and the associated spectroscopies (EDS and EELS), infrared and Raman spectroscopies. Annealing thin films containing 25 at. % of P at temperatures larger than 950°C leads to the formation of a SiP crystalline phase. DFT calculations of the vibrational modes allow us to identify this phase as being orthorhombic SiP. STEM investigations confirm the presence of lamellar SiP grains coexisting with Si crystallites.

2:50 PM  Invited
Polymer Composites Reinforced with 3D Foam of 2D Materials: Tony Thomas1; Kazue Lopez1; Arvind Agarwal1; 1Florida International University
    The bottleneck in the processing of polymer composites with 2D materials is their severe agglomeration. Free standing 3D architecture of 2D materials is a popular nano-filler, as their reticulated networks of branches and nodes offer seamless pathway for photon and electron conduction in the polymer. They are fabricated by CVD technique, which demands high energy. Additionally, pristine foams are fragile and easily disintegrate upon handling. The presentation will highlight the fabrication of rigid 3D foams of 2D materials like graphene nanoplatelets (GNP) and hexagonal boron nitride nanoplatelets (BNNP) via freeze drying (FD). The rigid FD GNP and BNNP foams exhibited 1200 and 230 times higher elastic modulus respectively than pristine graphene foam. The FD foams were reinforced in Polydimethylsiloxane (PDMS) and shape memory polymer (SMP) to augment their thermal properties. The improvement in the thermal properties of the polymer nanocomposites will be discussed in details along with their potential applications.