Frontiers in Materials Science, Engineering, and Technology: An FMD Symposium in Honor of Sungho Jin: Process-Property-Performance Correlations: Q-D, 2-D and 3-D Materials & Structures
Sponsored by: TMS Functional Materials Division, TMS: Biomaterials Committee, TMS: Electronic Packaging and Interconnection Materials Committee, TMS: Nanomaterials Committee, TMS: Thin Films and Interfaces Committee
Program Organizers: Fay Hua, Intel Corporation; Tae-Kyu Lee, Portland State University; Young-Ho Kim, Hanyang University; Roger Narayan, University of North Carolina; Choong-un Kim, University of Texas at Arlington; Nuggehalli Ravindra, New Jersey Institute of Technology
Monday 2:00 PM
February 27, 2017
Location: San Diego Convention Ctr
Session Chair: Choong-Un Kim, University of Texas - Arlington; Srinivasa Rao Singamaneni, North Carolina State University
2:00 PM Introductory Comments
2:10 PM Keynote
Direct Conversion of h-BN into c-BN and Formation of Epitaxial c-BN/Diamond Heterostructures: Jagdish (Jay) Narayan1; 1North Carolina State University
We review the discovery of new phases of carbon (Q-carbon) and BN (Q-BN) and address critical issues of direct conversion of carbon into diamond and h-BN into c-BN at ambient temperatures and pressures in air without any need for catalyst or hydrogen. The Q-carbon and Q-BN are formed as a result of quenching from super undercooled state by using high-power nanosecond laser pulses. We discuss the equilibrium phase diagram (P vs. T) of carbon, and show that by rapid quenching kinetics can shift thermodynamic graphite/diamond/ liquid carbon triple point from 5000K/12GPa to super undercooled carbon at atmospheric pressure in air. Similarly, the hBN-cBN-Liquid triple point is shifted from 3500K/9.5GPa to as low as 2800K and atmospheric pressure. Q-phases exhibit improved mechanical hardness, electrical conductivity, chemical and physical properties, including room-temperature ferromagnetism (RTFM) and enhanced field emission. The undercooled state is quenched into Q-phases or host of nanostructures and thin films.
2:40 PM Invited
Elastic Coupling between Layers in Two-dimensional Materials: Yang Gao1; Angelo Bongiorno2; Elisa Riedo1; 1City University of New York Advanced Science Research Center,The City College of New York; 2CUNY College of Staten Island
Two-dimensional materials, such as graphene and MoS2, are films of a few atomic layers in thickness with strong in-plane bonds and weak interactions between the layers. The in-plane elasticity has been widely studied in bending experiments where a suspended film is deformed substantially; however, little is known about the films’ elastic modulus perpendicular to the planes, as the measurement of the out-of-plane elasticity of supported 2D films requires indentation depths smaller than the films’ interlayer distance. Here, we report on sub-ångström-resolution indentation measurements of the perpendicularto- the-plane elasticity of 2D materials. Our indentation data, combined with semi-analytical models and density functional theory, are then used to study the perpendicular elasticity of few-layer-thick graphene and graphene oxide films.We find that the perpendicular Young’s modulus of graphene oxide films reaches a maximum when one complete water layer is intercalated between the graphitic planes. This non-destructive methodology can map interlayer coupling and intercalation in 2D films.
Synthesis and Characterization of Nitrogen-vacancy (NV) Centers in Diamond Nanostructure Formed by Laser Annealing Technique: Anagh Bhaumik1; Ariful Haque1; Jagdish Narayan1; 1North Carolina State University
NV centers in diamond have remarkable optical, electrical and magnetic properties. We report a unique method for synthesis of pure and nitrogen doped nanodiamonds at room temperatures and atmospheric pressure. Amorphous carbon films are deposited onto c-sapphire substrates using pulsed laser deposition (PLD) technique employing KrF nanosecond laser. N doped carbon films are formed by simultaneous bombardment with N2+ (0.5-1.0 KeV) ions using RF plasma. Subsequently, the films are irradiated with nanosecond laser pulses of ArF excimer laser having energy density 0.5-1.0Jcm-2 to form micro and nano structures of diamond. N atoms and vacancies are incorporated in the diamond lattice during the liquid phase growth. SEM, EBSD, Raman spectroscopy, TEM, and EELS are performed to characterize the samples. Electrical pumping of NV centers in diamond is also performed with the application of an external electric field in the presence of 532 nm laser, which have immense application in quantum computing.
3:30 PM Break