In this presentation, I will delve into the exciting realm of monolithic 3D integration, where emerging 2D FETs take center stage, empowering advanced memory, and logic devices. Notably, our recent breakthroughs have culminated in the successful demonstration of wafer-scale 2-tier and 3-tier 3D integration, utilizing MoS2 and WSe2 FETs as the building blocks. These achievements have paved the...
Introducing alkali metal atoms between the carbon layers of graphite to form graphite intercalation compounds (GICs), can tune the interlayer spacing and charge the graphite host through a variety of electronic ground states. Hexagonal boron nitride (hBN) is another prototypical layered material and possesses a hexagonal network consisting of B and N atoms. Because of its structural similarity...
The formulation of quantum mechanics in the late 1920s forever changed physics. More recently, quantum materials have emerged, presenting fascinating opportunities in condensed matter physics. Elementary interactions among elements such as electrons, phonons, and other quasiparticles in quantum materials give rise to the emergence of intriguing phases and offer enormous opportunities for the...
Two-dimensional (2D) semiconductors, such as molybdenum disulfide (MoS2), are emerging as key materials for next-generation electronics, addressing challenges in the miniaturization of silicon-based technologies. Despite progress in scaling-up 2D materials, integrating them into functional devices remains challenging, particularly in the context of three-dimensional integration. Here, we...
Among the potential materials used in electrochemical devices, reduced graphene oxide (RGO-H) stands out due to its high surface area, excellent electrical conductivity and strong mechanical properties. However, pristine graphene oxide has limitations of restacking of layers. One effective strategy to enhance grapheneโs properties is heteroatom doping, which introduces heteroatom atoms into...
Europium carboxylates were synthesized and in situ self-assembled to illustrate ligand and chemical environment influence on magnetization. The compounds [Eu(O2(CH3)n) x(H2O)2]m, in which n and m are determined by the carboxylate acid, obtained have the same structural components regardless of the alcohol provided as confirmed by XRD. The spatial arrangement of these compounds is shown to...
Innovation in materials science and engineering resides in our ability to control the structure of materials at the nanoscale in order to design advanced materials with outstanding functional properties (electrical, optical, magnetic, photocatalytic, etc.). One of the most powerful means to arrange matter at the nanoscale is to use laser produced plasmas due to their exceptional ability to...
My talk will focus on recent efforts in my lab to design novel conjugated polymers and explore their use in iono-electronic devices. Our research aims to develop next-generation smart electronics for both healthcare applications and future consumer products. The implementation of such devices is challenging, as it requires electronic hardware with: i) excellent mechanical flexibility, ii)...
This paper presents experimental study of ultra-low friction on carbon coated equiatomic and non-equiatomic complex concentrated alloys (CCAs). Carbon nano crystals with graphene signatures were deposited on equiatomic (FeMnNiCoCr and FeMnNiVCo) and non-equiatomic (Fe40Mn40Cr10Co10 and Fe40Mn40Ni10Co10) CCAs. The deposition was done by using a low-cost and novel high temperature biowaste...
In this research, DFT and TD-DFT calculations were performed on two phenyl aniline imidazole moieties, namely (4โ(diphenylamino)-[1,1โ-biphenyl]-4-yl)(4-(4โ(diphenylamino)-[1,1โ-biphenyl-4-yl)-1-methyl-1H-imidazol-2-yl)methanone and (4โ(diphenylamino)-[1,1โ-biphenyl]-4-yl)(4-(4โ(diphenylamino)-[1,1โ-biphenyl-4-yl)-1-octyl-1H-imidazol-2-yl)methanone as well as two carbazole aniline moieties ...
Silicon has driven semiconductor advancements through miniaturization, but its scaling challenges necessitate exploring new materials. Two-dimensional (2D) materials, with their thin structure and high mobility, are promising alternatives. Recent years have witnessed significant progress in wafer-scale growth, high-performance field effect transistors (FETs),and integrated circuits based on 2D...
During the last decade, automatic data analysis methods concerning different aspects of crystal analysis have been developed for high resolution electron microscopy, especially transmission and scanning transmission electron microscopy (TEM and STEM). For example, unsupervised
primitive unit cell extraction and automated crystal distortion and defect detection.
Here, we propose and...
In a continent like Africa where challenges such as climate change impacts, energy needs, access to resources and data management are acute, the development of basic sciences is more necessary than ever. The East African Institute for Fundamental Research (EAIFR) was established in Rwanda as an ICTP partner institute and a Category 2 institute under the auspices of UNESCO to address the...
The rise of graphene and related 2D materials makes it possible to form heterostructures held together by weak interplanar van der Waals (vdW) interactions. The interactions of such 2D layers with adventitious contaminants is able to exert a strong effect on its major electronic characteristics [1]. However, the controlled incorporation of ordered organic molecules within these systems holds...
Devices for electrochemical energy storage such as supercapacitors play an important role in current technologies and are potentially relevant players in the quest for a more sustainable development. Atomistic simulations of their microscopic behavior provide important information to complement experiments and foster progress [1]. However, the size and length scales of these simulations often...
Conjugated polymers are formidably rich systems where the photophysical and electronic properties are enmeshed with their complex macromolecular structure. In the case of ฯ-conjugated polymers, the photoaggregates are sensitive to the local chain conformations such that a wealth of information about the polymerโs nanostructure can be extracted from linear absorption and photoluminescence...
Afterglow materials promise round-the-clock photocatalysis using stored electrons, holes, or energy to drive a chemical reaction in darkness after the cessation of illumination. Irradiation of WO3 nanoparticles temporarily turns the material blue, due to a transient NIR band that forms signaling the trapping of electrons. We show that WO3 nanoparticles are capable of retaining the trapped...
In the last decade, the field of luminescent rare earth doped nanoparticles has progressed from the basic understanding of the photophysical properties governing their nanoscale luminescence to their use in a variety of applications, with considerable focus in biology and medicine. This interest stems primarily from the ability to stimulate these luminescent nanoparticles with near-infrared...
Driven by the global initiative to accomplish net zero emissions by 2050, there has been growing consensus in embracing sustainable energy pathways. Solar electric power generation, solar hydrogen production from water and solar CO2 recycling are some of the most explored strategies that are considered green; however, for these approaches to be truly sustainable, the raw materials must be...
Inorganic crystals combining both a high refractive index and a wide band gap are of great importance for many advanced optical applications. However, the observed inverse relationship between these two properties hampers a straightforward identification of promising materials. To go beyond a costly and time-consuming trial and error approach, an ab initio high-throughput screening was...
Simulating reactor conditions inside a transmission electron microscope (TEM) gives insight into the rate of defect formation and survivability of materials in the environments in which they were designed to perform. Efforts to fully encapsulate dynamic processes occurring in a material have been challenging, owing to the large volume of information collected from an individual experiment and...
Keywords: Metavalent, Chalcogenides, Phonons, Antimony, Lead Telluride,
Theme: Materials for Energy
Higher chalcogenides, such as GeTe, GeSe and Sb2Te3, have been recently proposed as a new class of materials, called metavalent, which has distinct properties compared to metallic and covalent compounds [1].
Metavalent materials share an unusual combination of functional properties such as...
Ultrahigh-๐ crystalline disk-resonators have the capability to trap photons by total internal reflection for a duration of up to several tens of microseconds. Such exceptionally long photon lifetimes enhance nonlinear lightโmatter interactions, thereby permitting Kerr, Raman and Brillouin stimulated processes with record low threshold power. In this communication, we present some of the most...
MICHAEL J. GORDON
University of California, Santa Barbara (Chemical Engineering, Santa Barbara, CA, USA)
Corresponding author: Michael Gordon, gordon@ucsb.edu
Keywords: bio-inspired, photonics, metasurfaces
Theme: Advanced Materials
This talk will highlight our work to understand and translate fundamental biological mechanisms of light manipulation and surface โengineeringโ into new...
Chiral edge states are the fingerprint of the bulk-edge correspondence in a Chern insulator. Co-propagating edge modes, known as antichiral edge states, have been predicted to occur in the so-called modified Haldane model describing a two-dimensional semi-metal with broken time reversal symmetry. These counterintuitive edge modes are argued to be immune to backscattering and extremely robust...
Optical wavefront shaping (WFS) involves the ability to manipulate light fields both spatially and temporally. It has largely been enabled by the availability of spatial light modulators (SLM). SLMs are used to create arbitrarily complex light fields and also provide means to manipulate the fundamental constituents of classical light or single photons, which obey the laws of quantum physics....
Uranium dioxide is the main fuel used in light water reactors due to its relative radiation stability, high melting point, and chemical stability. However, fission gas release during reactor operations leads to degradation in thermal conductivity with an associated increase in thermal stresses and swelling. Promoting large grains during fuel sintering slows down fission gas diffusion to grain...
The National Science Foundation's Division of Materials Research (DMR) supports fundamental and interdisciplinary research in materials science, aiming to advance scientific knowledge and foster technological innovation. Through its National Facilities and Instrumentation (NaFI) portfolio, DMR supports US researchers to acquire or develop state-of-the-art instrumentation and infrastructure....
Columnar thin films (CTFs) are assemblies of parallel straight nanocolumns of nanoscale cross-sectional dimensions grown by physical vapor deposition on appropriate substrates. Sculptured thin films (STFs) are similar, but the columnar shape is architected for specific objectives. One objective was realizing polarization-universal bandgaps. We architected the columnar shape to fabricate...
Nb50Ru50 is considered a potential high-temperature shape memory alloy (HTSMA) due to its transformation from the cubic B2 phase to the tetragonal L10 phase at 1100โ. This renders it a potential alloy for developing actuating devices for aeronautics applications. However, the second transformation from the L10 is still not well understood. Previously, some authors reported an L10โmonoclinic...
The escalating threat of counterfeiting in supply chains necessitates advanced product authentication and traceability. Current Physical Unclonable Functions (PUFs) used for hardware security, leverage manufacturing variations but remain inherently static and vulnerable to sophisticated duplication methods. This work introduces a novel approach to supply chain security by deploying kinetics of...
An ab initio study of Zintl Na2CuP ternary semiconductor compounds was carried out by applying first-principles methods to calculate the structural, electronic, elastic, mechanical, and optical properties using generalised gradient approximation (GGA) and metaGGA exchange-correlation functionals. The bandgap was determined to be 0.7523 eV and 0.7848 eV using GGA with Wu-Cohen and...
On applying a small bias force, non-equilibrium systems may respond in paradoxical ways such as with giant negative mobility (GNM) โ a large net drift opposite to the applied bias, or giant positive mobility GPM) โ an anomalously large drift in the same direction as the applied bias. Such behaviors have been extensively studied in idealized models of externally driven passive inertial...
CVD graphene electrodes for photo-detection
AFRAH BARDAOUI1*, RABIAA ELKAROUS1, JรRรME BORME2, NABIL SGHAIER1, PEDRO ALPUIM2, RADHOUANE CHTOUROU1
1 Laboratory of Nanomaterials and Systems for Renewable Energies, Research and Technology Centre of Energy, Borj Cedria Science and Technology Park, 2050 Hammam-Lif, Tunisia
2 2D Materials and Devices Group, International Iberian Nanotechnology...
**Keywords: ** Density functional theory (DFT), Phase stability, Elastic properties, Martensitic phase transformation
**Abstract: ** There is a growing need for intelligent materials that can function proficiently beyond TiNi (Nitinol) shape memory alloys (SMAs) operational limitations. Apart from its distinctive shape memory effect and super elasticity. Nitinol undergoes martensitic phase...
Due to their attractive combination of properties such as low elastic modulus, good formability, low density, excellent corrosion resistance and biocompatibility, nickel-free metastable ฮฒ-Ti alloys are expected to be key in manufacturing the next generation of biomedical implants. Consequently, research and development on ฮฒ-Ti alloys bearing only non-toxic elements has increased drastically...
Halide perovskite materials have gained enormous attention for their semiconducting properties, higher power conversion efficiency and potential applications in a wide range of fields of study, along with their two key limitations: stability and toxicity. Despite great progress made on halide perovskites and many promising research developments, the issues of stability and toxicity have not...
This study engaged ab initio Density Functional Theory (DFT) within the Generalized Gradient Approximation (GGA) with the flavour of Perdew โ Burke- Ernzerhof (PBE) parameterization to investigate the structural and transport properties of half-Heusler compound HfIrSb, full-Heusler compound HfIr2Sb and their interface HfIr2Sb/HfIrSb. Three different atomic configurations that is the alpha,...
