Functional Nanomaterials: Functional Low-dimensional Materials (0D, 1D, 2D) Driving Innovations in Electronics, Energy, Sensors, and Environmental Engineering and Science 2021: Nanomanufacturing & Sensors
Sponsored by: TMS Functional Materials Division, TMS: Nanomaterials Committee
Program Organizers: Jiyoung Chang, University Of Utah; Michael Cai Wang, University of South Florida; Sarah Zhong, University of South Florida; Sun Choi, Korea Institute of Science and Technology; Pei Dong, George Mason University
Wednesday 8:30 AM
March 17, 2021
Room: RM 45
Location: TMS2021 Virtual
Session Chair: Jiyoung Chang, University of Utah; Sun Choi, Korea Institute of Science and Technology
8:30 AM Invited
In-situ Production of Metal Nanoparticles on Polymer Derived Ceramic Fibers for Catalysis and Sensing: Sajia Afrin1; Jean Calderon1; Lei Zhai1; 1University of Central Florida
Silicon oxycarbide (SiCO) produced from a polymer derived ceramic route are a class of ceramic synthesized by a thermal decomposition of polymeric precursors like polysiloxane. Functional ceramic fibers with high electrical conductivity and metal nanoparticles (e.g. nickel and silver) have been fabricated through electrospinning the solutions of polysiloxane and common metal salts followed by pyrolysis. The composition and structure of the fibers were examined at different fabrication stages to understand the composition and structure change during the fabrication and the effect of composite fiber composition/structure on their properties. The performance of composite ceramic fibers as the catalysts and substrates for surface enhance Raman spectroscopy will be discussed in the presentation.
8:55 AM
Suspended Graphene H2 Sensors With Enhanced Sensitivity Fabricated Using Direct-write Functional Fibers: Abiral Regmi1; Dongwoon Shin1; Noori Na1; Jiyoung Chang1; 1University of Utah
In this study, we investigate the hydrogen sensing mechanism of precisely patterned suspended graphene-based sensor fabricated using near-field electrospinning of functional polymer. The functional polymer changes the specificity of the graphene channel by introducing doping effect and also can be used as an etch mask to pattern suspended graphene channel of desired width. Suspended graphene channels have higher surface to volume ratio and larger gas adsorption area; thereby, sensor with enhanced sensitivity is realized. We characterize the actual sensor’s response at various conditions of molecular adsorption and compare the result with simulated values. The ultra-low power consumption capability and miniature size of the sensor makes the sensor ideal for sensing application. Therefore, our study highlights a simple, cost-effective and one-step precise patterning process to create suspended graphene channels via near-field electrospinning and realizes a suspended graphene sensor to demonstrate the importance of our method in the field of chemical sensing.
9:15 AM Invited
Laser Digital Patterning for Nickel-based Flexible Electrodes and Its Applications for Electronics and Sensors: Daeho Lee1; 1Gachon University
Patterning of metal/metal oxide electrodes by applying laser direct writing process on solution-processed nanoparticle thin films is one of the promising routes to achieve photolithography-free, low-cost, and on-demand electrode fabrication. Since sintered parts have stronger adhesion to the substrate than non-irradiated parts, only sintered parts remain after a simple washing process. This process can be applied on flexible substrates owing to the unique characteristics of laser as a heat source. In this talk, I will introduce recent research activities on fabrication of Ni-based flexible electrodes by using solution-processed NiOx nanoparticle thin films and applying a low-power laser process. As its applications, mechanically and chemically stable transparent conductors, and ultra-sensitive temperature sensors will be demonstrated.
9:40 AM Invited
Redesigning Batteries via Additive Manufacturing: Corie Cobb1; 1University of Washington
Technology progressions in wearable devices, portable electronics and electric vehicles have motivated a shift in Lithium-ion (Li-ion) batteries to accommodate rapid charge, long life, high power and energy materials with more efficient packaging. An emerging trend to address this technology shift is the use of Additive Manufacturing (AM) to rapidly fabricate batteries with customized 3D geometries on a micron to millimeter scale, changing the way we fundamentally fabricate energy storage devices today. 3D battery architectures enhance ion transport in existing battery materials, thereby increasing useable energy and power densities relative to conventional Li-ion batteries. This talk will highlight promising design and material concepts for high-performance 3D batteries from our research group, with a focus on battery inks, nanomaterial compatibility, and AM processing methods that are key components to enabling printable batteries.
10:20 AM Invited
Ultra-fast Nanomaterial Assembly and R2R Printing for High-performance Skin Sensors: Ying Zhong1; Long Wang2; Rui Kou2; 1University of South Florida; 2University of California at San Diego
Flexible skin-like sensors are essential for future human health monitoring and therapeutic treatment. Organic additives are often mixed into the functional components to offer the flexibility of the printed flexible sensors. However, the drying process is highly time-consuming, which is the bottle-neck to realize low-cost and fast R2R printing of flexible sensors. We present a new R2R printing technology by taking advantage of the "induction induced absorption" behavior caused by controllable electric field. Dry graphene, CNT, silver nanowire, and many kinds functional nanomaterials can be printed. The printing speed can reach as high as 50 cm2/s. The specially assembled 3D structures offer high flexibility and sensitivity, allowing our skin-like sensors able to detect pressure as low as 2.5 Pa, as well as sound frequency in hundreds of hertz. This technology opens the new door for fast and low-cost nanomaterial assembly and high-performance flexible sensor processing.
10:45 AM
Transparent and Flexible Nanoelectrodes for Wearable Electronics by Direct-writing of PEDOT:PSS-nanofiber: Dongwoon Shin1; Abiral Regmi1; Jiyoung Chang1; 1University of Utah
Conductive polymers have garnered extensive attention due to their excellent mechanical flexibility for wearable electronics. Particularly, PEDOT:PSS has been widely investigated, and now its electrical conductivity as a thin-film (2D) has been reported as high as Indium tin oxide. However, the research on PEDOT:PSS as a fiber (1D) has not been conducted. Herein, we will present the direct-writing method of PEDOT:PSS on top of the graphene layer, in which PEDOT:PSS-nanofiber/graphene becomes flexible and transparent nanoelectrodes. First, a transferred CVD-grown graphene layer on an insulating substrate serves as a ground layer for the droplet-jet mode near-field electrospinning. The printed PEDOT:PSS-nanofiber, then, serves as a mask layer during the plasma etching process for the graphene region underneath it. As a result, the graphene/PEDOT:PSS-nanofiber composite, the same as the printed fiber pattern, is remained as nanoelectrodes. Electrical, optical, and mechanical properties of the composite will be investigated and discussed in the presentation.
11:05 AM
Wireless Strain Field Mapping of Metallic Surfaces through THz Time Domain Spectroscopy of Electrostrictive Coating Acting as Passive Sensor: Luis Reig Buades1; Abhijeet Dhiman1; Vikas Tomar1; 1Purdue University
Accurate mapping of strain fields yields important information of a material’s mechanical behavior, having important applications in structural monitoring, non-destructive testing, and characterization. In this work, a novel method of passive strain sensing on metals is introduced, it consists in measuring changes of an electromagnetic pulse in the THz range that goes through a coating attached to a metallic surface. This coating, composed of high dielectric micro-particles dispersed in a low dielectric matrix, shows a high electrostrictive behavior, meaning its dielectric constant changes when strained. This change in dielectric will affect the spectroscopy measurement of a THz wave that goes through the coating and reflects on the metal surface to a detector. By using this property, together with the high-resolution of THz waves and its ability to penetrate dielectrics, a passive strain mapping technique has been developed that allows to carry out measurements even with opaque materials in the beam-path.