2D Materials – Preparation, Properties & Applications: Session I
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

Monday 8:30 AM
February 28, 2022
Room: 252C
Location: Anaheim Convention Center

Session Chair: Ramana Chintalapalle, University of Texas ; David Bird, US Army

8:30 AM Introductory Comments

8:40 AM  
NOW ON-DEMAND ONLY – Synthesis and Characterization of Laser-induced Graphene for Gas Sensing Applications: Cadre Francis1; Zach Dike1; Ariel Briggs1; Paul Simmonds1; Jennifer Forbey1; David Estrada1; 1Boise State University
    Laser-induced graphene (LIG) is a graphitic material synthesized by laser writing a pattern on a carbon precursor. Different wavelengths of lasers have been used in this direct-writing process; in this work, we utilize a 450 nm wavelength bench top laser to create graphene using a polyimide precursor. By varying the intensity and focus of the incident beam, we have been able to create multilayer graphene, confirmed by Raman analysis. Scanning electron microscopy (SEM) and Hall measurements of the synthesized material has shown a highly porous structure with a large surface-area-to-volume ratio and low sheet resistance. The structure-property-processing-performance (SP3) correlations of LIG provide a good foundation for gas sensing studies.

9:00 AM  Invited
A Comprehensive Understanding of the Gas Sensing Properties of 2D Materials Using the Framework of Density Functional Theory: Mohsen Asle Zaeem1; Siby Thomas1; 1Colorado School of Mines
    This work presents a transferrable computational framework based on density functional theory (DFT) to analyze the gas sensing capabilities of pristine and defective two-dimensional (2D) materials. We investigate the gas sensing properties of different 2D materials such as Si2BN, Ti2CX2 (X=F, O, OH) MXenes, BP, and RuC, by analyzing the adsorption energy, charge transfer, electronic properties, and desorption time of different atmospheric toxic gas molecules (N2O, NO2, NH3, NO, CO2, COCl2) adsorbed on these 2D materials. Results show considerable charge transfer from the gas molecules via a stable physisorption process. And the low adsorption energy of gas molecules during the interaction with the 2D materials signifies the possibility of a large number of adsorption-desorption cycles with an ultra-low temperature-dependent recovery time suitable for efficient gas sensors.

9:30 AM  
Corrosion Behaviour of Atomic Layers of Graphene on Nickel Surfaces Exposed to Aggressive Microbial Environments: Ramesh Devadig1; Md Hasan-Ur Rahman1; Pawan Sigdel1; Suvarna Talluri1; Manoj Tripathi2; Bharat Jasthi1; Venkataramana Gadhamshetty1; 1South Daota School of Mines and Technology; 2University of Sussex
    Despite significant choices for preventing the abiotic forms of corrosion effectively, there exists a lack of reliable protective coating for combating corrosion of metals exposed to aggressive microbial environments. Microbiologically influenced corrosion, a dangerous corrosion form has been reported to result in colossal monetary losses. Here we focus on developing protective coatings based on atomic layers of graphene using nickel as a technologically relevant metal and genetically tractable Desulfovibrio Alaskensis 20 as a model for sulphate reducing bacteria. Here we report an unusual behaviour of polycrystalline nickel surfaces modified with a single layer of graphene. We report that the nickel surfaces modified with graphene layer undergo an accelerated corrosion (12-fold higher) when compared to pristine form of nickel. We present a series of electrochemistry and microscopy tests to unveil this counterintuitive behaviour. We also present strategies to obtain rationally designed graphene coatings for effectively combating the MIC of nickel surfaces.

9:50 AM  
Effect of Temperature and Acoustic Pressure during Ultrasound Liquid Phase Processing of Graphite in Water: Justin Morton1; Dmitry Eskin2; Nicole Grobert3; Jiawei Mi4; Kyriakos Porfyrakis5; Paul Prentice6; Iakovos Tzanakis1; 1Oxford Brookes University; 2Brunel University London; 3University of Oxford ; 4University of Hull; 5University of Greenwich; 6University of Glasgow
    Ultrasound assisted liquid phase exfoliation is a promising method for manufacturing 2D materials. Understanding the effect of ultrasonication parameters such as temperature and input power on the developed pressure field is pivotal for optimisation of the process. Limited research has been carried out to determine the optimal temperature for exfoliation, with some data generating disputed results. Simply maximising sonication power does not necessarily produce higher yield due to shielding. In this study, a high-temperature calibrated cavitometer was used to measure the acoustic pressure generated in different graphite solutions in deionised water at various temperatures (10-70 ℃) and input power conditions (20-100%). In addition, high-speed optical imaging revealed insight on shock wave generation from transient bubble collapses in different sonication conditions. The optimal sono-exfoliation parameters were determined using 20% input power in 10 ℃ for a graphite flake solution, and 100% input power in 40-50 ℃ for a graphite powder solution.

10:10 AM Break

10:30 AM  
Ferromagnetism in Q-carbon Balls as a Function of Their Size: Nayna Khosla1; Jagdish Narayan1; Kaushik Sarkar2; Dhananjay Kumar2; 1North Carolina State University; 2North Carolina Agricultural and Technical State University
    The Q- carbon is reportedly the densely packed metastable state phase of carbon with about 80% sp3 content. The pure Q- carbon exhibits extraordinary Hall Effect and room temperature ferromagnetism whereas the Boron doped Q- carbon shows superconductivity. We have created Q-carbon balls (30-50nm) which exhibit ferromagnetism at room temperature for the host of applications ranging from nanosensors to targeted drug delivery. The isothermal field dependent magnetization plots confirm room-temperature ferromagnetism in Q-carbon with a finite coercivity (70Oe) at 300 K and a Curie temperature of 550 K, obtained by the extrapolation of the fits to experimental data using modified Bloch’s law. In Q-carbon balls grown on sapphire, we observed that these magnetic and electrical properties can be attributed to the abundant unpaired electrons near the fermi energy level. This talk will focus on the ferromagnetic properties as a function of size to optimize the magnetic properties.

10:50 AM  
NOW ON DEMAND ONLY: Well-defined 3D Printing of Titanium Carbide (Ti3C2Tx) MXene Nanosheets into Complex and Hierarchical Microarchitectures with High Aspect Ratio: Bin Yuan1; Chunshan Hu1; Md. Azahar Ali1; Rahul Panat1; 1Carnegie Mellon University
    Building functional nanomaterials into complex three-dimensional (3D) micro-architectures with high aspect ratio can provide superior device performance compared with simple two-dimensional (2D) patterns. Even though functional titanium carbide (Ti3C2Tx) MXene nanosheets have received much attention for energy storage, healthcare, advanced composites, and membranes; arranging them into well-defined complex 3D device structures remains a significant challenge and has not been realized. Among the techniques for building 3D structures, 3D printing is advantageous compared with conventional ones (e.g. lithography) as it allows for flexible customization, rapid prototyping, and minimal waste generation. We report printing of Ti3C2Tx MXene nanosheets into truly 3D microarchitectures with different geometries (including pillar array, wavy-wall array, and scaffold array), at very high aspect ratios, high printing resolution (~10 μm), excellent size controllability, and smooth surface on various substrates. This technique is critical for the fabrication and application of MXene-based high-performance 3D micro-electronics (e.g. wearable healthcare devices).