Recent Advances in Functional Materials and 2D/3D Processing for Sensors and Electronic Applications: Printed Electronics III: Functional Materials and Devices
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Pooran Joshi, Elbit Systems of America; Ravindra Nuggehalli, New Jersey Institute of Technology; Anming Hu, University of Tennessee; Tolga Aytug, Oak Ridge National Laboratory; Konstantinos Sierros, West Virginia University; Yong Lin Kong, University of Utah; Parans Paranthaman, Oak Ridge National Laboratory

Tuesday 2:00 PM
February 25, 2020
Room: Carlsbad
Location: Marriott Marquis Hotel

Session Chair: Pooran Joshi, Oak Ridge National Laboratory; Tolga Aytug, Oak Ridge National Laboratory


2:00 PM  Invited
Novel Wide Bandgap Gallium Oxide (Ga2O3) Based Power Electronic Devices: Parans Paranthaman1; Mihee Ji1; Tolga Aytug1; Fred List1; Pooran Joshi1; Ivan Kravchenko1; Burak Ozpineci1; 1Oak Ridge National Laboratory
    The main goal of this project is to demonstrate the growth of high-mobility, epitaxial gallium oxide, Ga2O3, films on sapphire and gallium oxide substrates for 1-5 kV power device fabrication. Advanced power electronics enabled by wide bandgap (WBG) semiconductors offers the opportunity to significantly lower global electrical energy consumption, by more than 25% in 2025. Ga2O3 has unique properties with a bandgap of 4.8-4.9 eV that is significantly larger than those of SiC and GaN and offers the advantages of inexpensive substrates having superior breakdown voltages, higher efficiencies, and higher power capacity devices. Current methods to make GaN devices lead to prohibitively high costs and SiC substrates material quality is far from ideal. We will report our results on the growth of epitaxial Ga2O3 thin film growth with high mobility and less defects on cheaper substrate, and device fabrication.

2:25 PM  Invited
Formulation of UV Curable Resins Utilized in Vat Photo Polymerization for the Additive Manufacturing of Gun Propulsion Charge in 3d Printers (An Update): David Bird1; Elbert Caravaca2; Joseph Laquidara1; Ketih Luhmann1; Nuggehalli Ravindra3; 1United States Army ARDEC; 2United States Army ARDEC; 3New Jersey Institute of Technology
    Formulating resins specifically for UV laser stereolithography (SLA) is a promising material development process in the additive manufacturing (AM) development of enhanced gun propulsion charges. This is due to the ability to fabricate complex geometries with high dimensional resolution. Free radical initiated polymerization (FRP), incorporated into new and evolving SLA 3D printers, is an ideal process for generating gun charges but it requires formulators to pay specific attention to the monomer/oligomer selection, light source output, photointitiator system, and additives to stabilize the liquid formulation and the resulting final polymer. Furthermore, formulations must have high energy density with acceptable mechanical properties in order to enhance the propellant performance, often represented in terms of impetus, or force exerted on the projectile. In this work, custom energetic SLA resins for propellant have been formulated, characterized, and processed on a Formlabs 1+ Printer.

2:50 PM  
Rare Earth Based Multifunctional Perovskite Ceramic Materials for Electronic and Magnetic Applications: Dev Mahato1; Digvijay Singh1; 1National Institute of Technology, Patna
    The past decade has seen significant advances in fabricating electroceramics and their significant developments in microwave telecommunications and the emergence of low temperature co-fired ceramic technology. Electroceramics play essential roles in an ever-increasing extent of the functioning of manufactured products. During the past few years, functional double perovskite ceramic materials have attracted huge attention owing to their multi-disciplinary applications in electronics industry. Different classes of multifunctional double perovskites have gained much scientific interest owing to their rich physics, industrial and technological applications. This functional property can be explored for intelligent sensor, spintronic and functional device applications.In this work, we report electrical and magnetic properties of some double perovskite ceramics. The study of cyclic voltammetry charging discharging plot exhibit its use in supercapacitor and solar cells. The present structural, dielectric and magnetic data make this system for its multiferroic character a promising candidate to various modern functional device applications.

3:10 PM  
Structural and Magnetic Properties of CoPd Alloys for Spintronic Applications: Subhadra Gupta1; Joseph Abugri1; Billy Clark2; Pieter Visscher1; 1University of Alabama; 2Intel Corporation
    We have intensively studied perpendicular magnetic anisotropy (PMA) CoPd alloys deposited on a variety of seed layers for spintronic applications. These thin-film alloys can be used to pin MgO-based magnetic tunnel junctions utilized for non-volatile memory. Four different seed layers were utilized, on top of which 20 nm of Co25Pd75 was co-sputtered. The seed layers used were: Ta (5 nm), MgO (5 nm), Ta (5 nm)/Pd (5 nm) and Ta (5 nm)/Ru (5 nm)/ Ta (5 nm). The Co25Pd75 layer was capped with 5 nm Ta in each stack. The magnetic properties of the four samples varied considerably, showing the highest coercivity for the Co25Pd75 layer seeded by the Ta/Pd layers. High resolution cross-sectional transmission electron microscopy and x-ray diffraction showed that this seed layer produced the highest crystallinity in the fcc (111) Co25Pd75 film. Scanning electron micrographs showed that the Ta/Pd seed produced the smallest grain size.

3:30 PM Break

3:50 PM  
Coarsening of TiO2 Foams and its Effects on 3D Printing: Iole Pecora1; Konstantinos A. Sierros1; 1West Virginia University
     3D printing of TiO2 foams show great potential ranging from efficient solar cells, to batteries and radiation shielding in space applications. This is due to the ability to digitally manufacture complex shapes of multifunctional materials with little material waste. In particular, the foam architecture, providing multi-scale hierarchy, exhibits special properties and features that usually cannot be achieved by using traditional, bulk, non-porous materials. The ceramic foam inks for printing are challenging to control in terms of long-term stability and the determination of relevant parameters able to minimize their instability is still a major research issue. In this presentation we will discuss how the foam coarsening is affected by increasing the TiO2 particles concentration and its potential impact on the rheological properties of the foam inks as well as on their 3D printing characteristics.

4:10 PM  Cancelled
Ultrafast X-ray Imaging Study of Ultrasonic Liquid Phase Exfoliation of 2D Advanced Functional Materials: Ling Qin1; 1University of Hull
    Ultrasonic liquid phase exfoliation is a promising technique for producing large quantity 2D materials. However, the fundamentals of ultrasonic exfoliation has not been fully understood.In this paper, we report a systematic study using the ultrafast synchrotron X-ray imaging (up to 271,554 frame per second) technique available at the Advanced Photon Source, USA to investigate the liquid phase exfoliation dynamic.It will be focusing on capturing the dynamic interactions between ultrasonic bubbles and the peeling off of any layer of the 2D materials in different conditions (ultrasonic power, type of solutions/surfactants and temperature). We obtain systematic real-time image datasets in the ultrasonic exfoliation process in a temporal resolution never reported before.

4:30 PM  
Using In-situ X-ray Scattering to Identify the Mechanical Properties and Piezoelectric Properties of Electrospun P(VDF-TrFE) Nanofibers: Chia-Yin Ma1; Tu-Ngoc Lam1; Chun-Chieh Wang2; Wen-Ching Ko1; Wei-Tsung Chuang2; Chun-Jen Su2; Jyh-Ming Wu3; Sz-Nian Lai3; Mao-Yuan Lo1; Ying-Jhih Wang1; E-Wen Huang1; 1National Chiao Tung University; 2National Synchrotron Radiation Research Center; 3National Tsing Hua University
    In this study, we investigated the effect of annealing on the morphology and crystal phase changes of electrospun poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrFE)) nanofibers. We also identify the underlying deformation mechanisms of as-spun and annealed P(VDF-TrFE) nanofibers during stretch-hold deformation via in-situ synchrotron small and wide angle X-ray scattering (SAXS and WAXS). Annealing process induces an transformation from α to β phase crystalline. The transmission X-ray microscopy (TXM) exhibits the fiber orientations with different strain. In the end, our results demonstrate that annealing is an effective method to improve the piezoelectric response in electrospun P(VDF-TrFE) nanofibers.

4:50 PM  Cancelled
Synthesis of Silicon Nanowire and Crystalline Carbon Quantum Dot Hybrid Structures and Study of its Photoresponse and Photoluminescence Properties for Optoelectronic Device/Sensor Application: Sourav Sarkar1; Unmesha Ray2; Diptonil Banerjee3; Kalyan Kumar Chattopadhyay1; 1Jadavpur University; 2Indian Institute of Technology, Kharagpur; 3 Indian Institute of Engineering Science and Technology
    Recently, one dimensional material like Silicon nanowires (SiNWs) and zero dimensional material like Carbon quantum dots (CQDs) are being investigated for different size dependent properties. Here, we are reporting the fabrication of n-type SiNWs by metal assisted chemical etching (MACE) and synthesis of crystalline CQDs by hydrothermal process from natural precursors. Synthesis conditions were varied for preparing three samples of CQDs to tailor the dimension of the CQDs leading to different size dependent optical properties. These CQD samples were spin coated on n-type SINWs to obtain n-SiNW-CQD hybrid structures. The photoresponse and photoluminescence (PL) property of the hybrid samples were studied under different illumination conditions. The Ilight/IDark was calculated to have value in the range of 1.36−3.83 from the photoresponse property. The PL peaks were centered around 389nm and 398nm for excitation wavelength of 243.8nm and 260nm respectively. Therefore these hybrid structures can be explored for optoelectronic device/sensor applications.