Speaker: Prof. Antonio Castro Neto
Abstract Details:
2023 VinFuture Webinar Series - Smart Materials for Energy Harvesting and Storage
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Affiliation: European Union (EU) Graphene Flagship, NUS Institute for Functional Intelligent Materials (I-FIM) Joint Workshop
The European Union (EU) Graphene Flagship and Institute for Functional Intelligent Materials invites all interested parties to attend the first EU-Singapore Workshop – Research Innovation in 2D Materials & beyond.
The workshop will feature esteemed speakers from EU and Singapore in the field of 2D Materials.
You may register for this event, and download the workshop programme at:
https://ifim.nus.edu.sg/the-1st-graphene-flagship-eu-singapore-workshop-on-graphene-and-related-2d-materials/
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Speaker: Associate Professor Ryo Ishikawa
Affiliation: Institute of Engineering Innovation, The University of Tokyo
Abstract Details:
Since the invention of multi-poles-based aberration correctors, the spatial resolution in electron microscopy has been significantly improved, and observations with sub-angstrom resolution are routinely available. The spatial resolution in scanning transmission electron microscopy (STEM) is now reached 40.5 pm –less than half an angstrom-, which might be sufficient to investigate the local atomic and electronic structures of materials. However, the sub-angstrom resolution is only valid in the projected two dimensions, and the resolution along the axial direction, known as depth resolution, is still far from atomic resolution. Previously, we determined the three-dimensional location of a single dopant using quantitative annular dark-field (ADF) STEM imaging. However, it requires a complex experimental setup and massive image simulations, suggesting we should develop a more flexible and accurate practical method. To realize true three-dimensional atomic resolution in STEM, we have developed large-angle illumination STEM with a Delta-type higher-order aberration corrector. By precisely correcting all the aberrations, we achieved 2.1 nm depth resolution with an illumination angle of 63 mrad at 300 kV. Furthermore, by combining statistical analysis with STEM depth sectioning, we also achieved 3D atomic resolution at the oxide surface.
Join us at NUS Lecture Theatre 1, or through Zoom.
Ryo Ishikawa is a Project Associate Professor at the Institute of Engineering Innovation at the University of Tokyo, Japan. He completed his Ph.D. in Materials Science at the University of Tokyo in 2011. Following his postdoctoral position at the University of Tokyo, he moved to Oak Ridge National Laboratory in the USA from 2012 to 2014 and then joined the University of Tokyo as an Assistant Professor. In 2020, he was appointed to the current position at the University of Tokyo. In addition, he had an adjunct appointment in JST-PRESTO (Intelligent Measurement Analysis) from 2018 to 2022.
He received several scientific awards, including the Encouragement Prize from The Japan Institute of Metals (2015), the Albert Crewe Award from the Microscopy Society of America (2016), the Encouragement Prize from The Japanese Society of Microscopy (2018), Honda Memorial Young Research Award (2021) and the Young Scientists’ Award from the Ministry of Education, Japan (2021).
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Speaker: Professor Hari Srikanth
Affiliation: Department of Physics, University of South Florida, Tampa FL, USA
Abstract Details:
Spin-heat coupling is important from a fundamental perspective as well as for many thermoelectric and thermomagnetic applications. Can we generate local heat with magnetic nanoparticles or \'super spins\'? What about manipulation of spin transport using thermal gradients? In this talk, I will provide some insights into these questions based on our research in a number of systems ranging from nanostructures to heterostructures including compensated ferrimagnets, topological Heusler systems, spin gapless semiconductors, interfaces of graphene, h-BN, 2D TMD materials on ferrites and garnets. The common theme is our ability to sensitively measure and tune the effective intrinsic and interfacial magnetic anisotropy in a large class of magnetic materials including bulk, nanoparticle assemblies and thin film heterostructures. I will describe how we combine conventional and relatively unconventional experimental techniques like magnetometry, nonlinear AC susceptibility, RF transverse susceptibility, magnetocaloric effect, anomalous Nernst effect (ANE), spin Seebeck effect (SSE), FMR spin pumping (FMR-SP) to probe the fundamental physics of spin dynamics, spin-heat coupling, thermal spin transport across interfaces. Some recent results on our ongoing projects including core-shell and anisotropic nanoparticles, influence of magnetic anisotropy on spin Seebeck effect (SSE) and anomalous Nernst effect (ANE), universal scaling of SSE in compensated ferrimagnets, estimation of magnon propagation length will be discussed.
Hari Srikanth is a Distinguished University Professor at the University of South Florida. He received his Ph.D. in experimental condensed matter physics from the Indian Institute of Science, Bangalore and has been at USF since 2000 where he directs the Functional Materials Laboratory. His research spans a wide range of topics in magnetism and magnetic materials. He has over 290 publications and has given over 200 invited talks around the world. In 2019, he was an IEEE Magnetics Society Distinguished Lecturer. Hari is a Fellow of the American Physical Society, Fellow of the Institute of Physics and a Senior Member of IEEE. He currently serves as an Associate Editor for Physical Review B and Editor for Journal of Alloys and Compounds. Hari has been closely involved with the MMM and INTERMAG conferences for more than 18 years serving as Publication Editor, Publication Chair and on program committees. He received a Fulbright Scholar Award (2019-2023) to be a visiting professor at Nanyang Technological University in Singapore and is also a visiting professor at IIT Bombay. He also recently received an Alexander von Humboldt Research Award to initiate research collaborations in Germany. Hari is a symposium co-organizer for ICMAT 2023 in Singapore and focus topic co-organizer for ICM 2024 in Italy.
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Speaker: Professor Jaehong Kim
Abstract Details:
Various noble metals have been employed as catalysts and co-catalysts to enhance the kinetics of reactions that are critical for environmental remediation. The need to maximize the available catalytic sites per unit mass, particularly due to noble metal scarcity and high cost, has driven the development of material architectures at the nanometer scale. Recent theoretical and experimental studies have explored noble metal catalysts on the sub-nanometer, atomic scale to maximize atomic efficiency. A single atom catalyst (SAC), also called atomically dispersed catalyst, is the theoretical limit in this endeavor, and previous studies have identified additional benefits such as low coordination state and strong interaction with the surrounding substrate resulting in enhanced selective catalysis. For past few years, our group has since been exploring various SACs (Pt, Pd, Ag, and Co) anchored on different substrates (SiC, C3N4, and TiO2) that exhibit unique catalytic properties. This talk summarizes our recent studies to advance the water treatment catalysts from the nano-scale toward the single atom scale such as (1) single-atom Pt and Pd anchored to SiC for selective defluorination of perfluorooctanoic acid (PFOA) and selective dehalogenation of various water pollutants and (2) spatial separation of two co-catalysts by coordinating single atom cobalt at the void center of C3N4 and anchoring anthraquinone at the edges of C3N4 platelets to significantly enhance the catalytic synthesis of H2O2, a precursor chemical for advanced oxidation.
Jaehong Kim is currently Henry P. Becton Sr. Professor of Engineering and Department Chair of Chemical and Environmental Engineering in School of Engineering and Applied Science at Yale University. His areas of interest include: 1) environmental application of nanomaterials; 2) development of photoluminescence / photocatalysis technology for environmental and energy application; and 3) membrane process and materials development. Kim received B.S. and M.S. degrees in chemical and biological engineering from Seoul National University in Korea in 1995 and 1997, respectively, and a Ph.D. degree in environmental engineering from the University of Illinois at Urbana-Champaign in 2002. After graduation, he joined the School of Civil and Environmental Engineering at Georgia Institute of Technology where he later held the title of Georgia Power Distinguished Professor and Associate Chair for Undergraduate Programs. He then moved to Yale University in 2013 as Barton L. Weller Endowed Professor. He has taught undergraduate courses such as Water Quality Engineering, Environmental Technology in the Developing World, and Environmental Engineering Laboratory, and graduate courses such as Physicochemical Processes and Design of Drinking Water Treatment Facilities. He is a recipient of various awards including Ackerman Award for Teaching and Mentoring from Yale University (2017), Bill Shultz Junior Faculty Teaching Award from School of Civil and Environmental Engineering (2013), Walter L. Huber Civil Engineering Research Prize from American Society of Civil Engineers (2013), Top Environmental Technology Paper Award from American Chemical Society (2012), Paul L. Busch Award from Water Environment Research Foundation (2009), Excellence in Research Award from Georgia Institute of Technology (2009), and CETL/BP Junior Faculty Teaching Excellence Award from Georgia Institute of Technology (2007).
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Speaker: Dr. Choongho Yu
Abstract Details:
This seminar presents two exciting outcomes and progresses with nanostructured carbon in energy conversion and storage. Nanostructured graphitic carbon has been utilized to simultaneously harvest and store electrical energy from thermal energy as well as improve the performance of lithium-sulfur batteries.
The first part of the seminar will introduce a novel energy storage device called “thermally” chargeable supercapacitors based on thermally induced ion transport. This device has been developed with polyelectrolytes as an energy harvesting unit as well as redox polymer-coated composite electrodes made of graphene and carbon nanotubes. Upon imposing a temperature gradient, this device simultaneously harvested and stored electrical energy with output voltage up to 2.1 V. The output voltage is high enough for operating small electronics unlike conventional thermoelectrics, suggesting the feasibility of thermal energy harvesting from low-grade heat sources such as body heat and heat-dissipating objects.
The second part presents self-assembled, porous 3D carbon nanotube structures and the modifications on their surfaces to create trench walls using mechano-chemical treatments. The trench-wall nanotubes act as dual hosts for high-areal-capacity sulfur cathodes and lithium anodes, delivering the energy density of Li-S batteries over those of conventional Li-ion batteries. This nano-trench strategy suggests a new way of designing graphitic carbon materials for high-energy-density batteries.
Dr. Choongho Yu is currently a professor and holder of the G. Paul Pepper ‘54 Professorship. He received his Ph.D. from the University of Texas at Austin and worked as a postdoc in the Materials Sciences Division at the Lawrence Berkeley National Laboratory prior to joining TAMU. His research is closely related to energy conversion/storage and electrochemical systems. Specific research topics include Li-S, Li-ion, and low-cost metal batteries, thermally chargeable supercapacitors, thermal energy storage with phase change materials, thermoelectric materials, and thermal transport in nanostructured materials.
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Speaker: Professor Seung Hwan Ko
Abstract Details:
Wearable electronic devices are getting attention as future electronics which must function under various dynamic and large deformation. However, conventional electrical and material engineering approaches have limitations in terms of highly deformable electronics fabrication. Thus, a new approach by converging mechanical engineering viewpoint along with conventional electrical and material engineering is required. The objectives of our research are to propose and study an innovative concept of ‘mechanical percolation-based transparent metal network’ which maintains mechanical, electrical, and optical properties under extreme mechanical and dynamic deformation by regulating dimension of nano-material for the first time in the world, and to apply the findings to fabrication of unprecedented transparent & highly deformable soft electronic devices, where the “transparency” will add more functionality to the wearable electronics.
In this talk, I will present our recent study on the Transparent & Stretchable/Flexible Electronics and its application in soft robotics and wearable electronics. Furthermore, the total research cycle including material, process development and applications will be introduced.
Prof. Seung Hwan Ko is a professor in Applied Nano & Thermal Science Lab, Mechanical Engineering dept., Seoul National University, Korea. Before joining Seoul National University, he had been a faculty at KAIST (Korea Advanced Institute of Science and Technology), Korea since 2009. He received his Ph.D. degree in mechanical engineering from UC Berkeley in 2006. He worked as a postdoc at UC Berkeley until 2009. His research interest is flexible/stretchable electronics for wearable electronics and soft robot application, laser assisted nano/micro fabrication process development, laser-nanomaterial interaction, and crack assisted nanomanufacturing. Currently, he is an associate journal editor of Soft Robotics.
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Speaker: Xianwen Mao
Abstract Details:
Electrochemical interfaces have continued to play critical roles in modern technologies that promise to tackle some of the world’s most pressing challenges associated with climate change, renewable energy and clean water. In this talk, I will describe my research efforts in developing a deeper understanding of electrochemical interfaces for sustainability with insights gained from soft materials design and operando functional imaging. In the first part of my talk, I will discuss how nanostructuring in molecularly engineered soft materials governs their electrochemical performance, with a particular focus on the critical role of self-assembled nanostructures at electrified interfaces. In the second part of my talk, I will describe my efforts in developing operando functional imaging tools to understand materials chemistry and properties at the single-entity level (e.g., single particles, single interfaces, single cells, single polymers). I will focus on (photo)electrochemical catalytic properties of emerging materials important for energy and environmental applications. I will discuss in detail single-entity-level insights inaccessible from bulk-level, ensemble-averaged measurements.
Xianwen Mao is an assistant professor of materials science and engineering at NUS. He obtained a Bachelor in Polymer Materials and Engineering from Tsinghua University and a PhD in Chemical Engineering from Massachusetts Institute of Technology. During his PhD, Xianwen also worked as a research intern at Novartis Vaccines and Diagnostics in Italy and National Renewable Energy Laboratory in the US. His PhD work focused on molecular engineering of soft materials with tunable catalytic and adsorptive properties for sustainability technologies. His postdoctoral research at Cornell was centered around developing single-molecule/particle techniques for operando functional imaging of complex energy materials. Dr. Mao has filed 7 patents, and his research works and technological innovations have been frequently featured in news media such as New York Times and Chemical & Engineering News.
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Speaker: Colin Robert Woods
Affiliation: NUS - Materials Science and Engineering
Abstract Details:
Two-dimensional (2D) hexagonal boron nitride (hBN) has become integral to the fabrication of heterostructures based on van der Waals 2D crystals. It is a wide-bandgap insulator with a unique combination of properties, including exceptional strength, large oxidation resistance at high temperatures, and optical functionalities. Like many Group III-nitride materials, its covalent bonds are highly polar; presenting the possibility of spontaneous and piezoelectric polarisations in the correct crystalline configurations. In this work, we outline the observation of in-plane piezoelectricity for monolayer (one atom thick) hBN [1] – a property which does not exist for the bilayer or bulk systems. Furthermore, we report on the emergence of spontaneous polarisation and ferroelectricity in anomalously stacked hBN interfaces [2]. Throughout this work we utilise complimentary atomic force microscopy and Kelvin Probe force microscopy imaging to quantify the effects. As well as detailed modelling for in-plane strain profiles and interface relaxation. Both in-plane piezoelectricity and out-of-plane ferroelectricity present exciting possibilities for precise control over device properties.
Dr. Colin Robert Woods is an Assistant Professor in the department of Materials Science and Engineering at the National University of Singapore. He is an expert in two-dimensional; materials, physics, and devices. Dr Woods received a Master’s in physics (MPhys) from the university of Manchester in 2012. In 2016, he received his PhD from the university of Manchester, for his work on interfacial interactions between graphene and hexagonal boron nitride (hBN). During this time, his principal contribution was to the understanding of the complex commensurate phase between graphene and hBN. Upon completion of his PhD, Dr Woods was awarded the Engineering and Physical Sciences (EPSRC-UK) doctoral prize fellowship to continue his inquiries. This resulted in the observation of macroscopic dynamical behaviour in 2D interfaces, and a novel sequence of ‘composite super-moiré structures’. In 2018, Colin was awarded the British Councils UK-Israel collaborative grant, which saw him work in Tel Aviv Universities Femto-Nano laboratory to work on femto-second optical phenomena in 2D materials. Dr Woods’ current interests are in strain-engineering and emergent phenomenon in 2D crystals.
[1] Ares, P., Cea, T., Holwill, M., Wang, Y. B., Roldán, R., Guinea, F., Andreeva, D. V., Fumagalli, L., Novoselov, K. S., Woods, C. R., Piezoelectricity in Monolayer Hexagonal Boron Nitride. Adv. Mater. 2020, 32, 1905504. https://doi.org/10.1002/adma.201905504
[2] Woods, C.R., Ares, P., Nevison-Andrews, H. et al. Charge-polarized interfacial superlattices in marginally twisted hexagonal boron nitride. Nat Commun 12, 347 (2021). https://doi.org/10.1038/s41467-020-20667-2
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Speaker: Professor Cheol Seong Hwang
Abstract Details:
Recent advances in a physical reservoir, which is a type of temporal kernel, have made it possible to perform complicated timing-related tasks using a linear classifier. However, the fixed reservoir dynamics in previous studies have limited application fields. In this study, temporal kernel (TK) computing was implemented with a physical kernel that consisted of a W/HfO2/TiN memristor (M), a capacitor (C), and a resistor (R), in which the kernel dynamics could be arbitrarily controlled by changing their parameters. After the capability of the TK to identify the static MNIST data was proven, the system was adopted to recognize the sequential data [ultrasound (malignancy of lesions) and electrocardiogram (arrhythmia)] that had a significantly different time constant (10 7 vs 1 s). The suggested system feasibly performed the task by simply varying the C and R. These functionalities demonstrate the high adaptability of the present TK system compared to the previous ones.
Cheol Seong Hwang received an M.Sc degree in 1989 and a Ph.D. degree in 1993 in the department of inorganic materials science and engineering, both from Seoul National University-Seoul, South Korea. In 1993, he joined the Materials Science and Engineering Laboratory of National Institute of Standards and Technology, MD USA, as a postdoctoral research fellow. Then, he joined Samsung Electronics as a senior researcher from 1994, made contributions to the fields of semiconductor memory devices by researching high-k dielectrics including (Ba,Sr)TiO3. Since 1998, he has been a professor in the Department of Materials Science and Engineering at Seoul National University. He has authored or co-authored more than 653 papers in international peer-reviewed scientific journals, which are cited ~33,500 times each (H-index 89), has given over 100 invited presentations at international conferences. He also holds ~130 international/domestic patents. He is a recipient of Alexander von Humboldt fellowship award, which made him stay in Forschungszentrum Juelich,, Germany as a Humboldt fellow in 2004, the 7th presidential young scientist award of the Korean government, and AP faculty Excellence Award, Air Products, USA, Inchon award, and Kyung-Ahm award. His current interests include high K gate oxide, DRAM capacitors, new memory devices including RRAM?PRAM, ferroelectric materials and devices, negative capacitance effect, and thin film transistors. He is also working actively in the field of neuromorphoric computing devices/materials. He served as the general chair of the International ALD Conference in June 2010, in Seoul, Korea. He also authored books entitled \"Atomic Layer Deposition for Semiconductor\" in 2013 through Springer, and \"Ferroelectricity in doped hafnium oxide\" in 2019 through Elsevier. He is a member of the Korean Academy of Science and Technology, National Academy of Engineering of Korea, and a fellow of the Royal Society of Chemistry, UK. On September 1, 2020, he was selected as the Seoul National University (SNU) Distinguished professor, which is awarded to only eight members among the ~2200 SNU professors.
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