A5075356781- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Metamaterials and Metasurfaces Applications
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Ferroelectric and Negative Capacitance Devices
- Advanced Materials and Mechanics
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Memory and Neural Computing
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Physics of Superconductivity and Magnetism
- Transition Metal Oxide Nanomaterials
- Advanced Sensor and Energy Harvesting Materials
- Diamond and Carbon-based Materials Research
- Liquid Crystal Research Advancements
- Neuroscience and Neural Engineering
- Nanomaterials and Printing Technologies
- Metal and Thin Film Mechanics
- Copper-based nanomaterials and applications
Purdue University West Lafayette
2022-2025
Northwestern University
2021
Contact engineering on monolayer layer (ML) semiconducting transition metal dichalcogenides (TMDs) is considered the most challenging problem toward using these materials as a transistor channel in future advanced technology nodes. The typically observed strong Fermi-level pinning induced part by reaction of source/drain contact and ML TMD frequently results large Schottky barrier height, which limits electrical performance field-effect transistors (FETs). However, at microscopic level,...
VO2 has shown great promise for sensors, smart windows, and energy storage devices, because of its drastic semiconductor-to-metal transition (SMT) near 340 K coupled with a structural transition. To push application toward room-temperature, effective temperature (Tc) tuning in is desired. In this study, tailorable SMT characteristics films have been achieved by the electrochemical intercalation foreign ions (e.g., Li ions). By controlling relative potential respect to Li/Li+ during process,...
Abstract Memristive systems present a low‐power alternative to silicon‐based electronics for neuromorphic and in‐memory computation. 2D materials have been increasingly explored memristive applications due their novel biomimetic functions, ultrathin geometry ultimate scaling limits, potential fabricating large‐area, flexible, printed devices. While the switching mechanism in memristors based on single nanosheets is similar conventional oxide memristors, nanosheet composite films complicated...
Multiferroic materials, where ferroelectric and magnetic orders coexist, have ignited substantial research interest due to the achievable manipulation of using external electric fields, a feature that has garnered serious for memory storage applications. Nonetheless, naturally occurring single-phase multiferroic materials are scarce, thus constraining options practical use. Over last decade, bismuth-based layered supercell (LSC) oxides emerged as novel candidates multiferroics, catalyzing...
Au nanostructures offer a wide range of applications such as surface-enhanced Raman spectroscopy, photovoltaics, and biosensors. Effective integrating well-controlled on chip via self-assembly process remains challenging most the were prepared by either chemical synthesis methods or lithography patterning techniques. This study introduces simple two-step approach for fabricating substrate with well controlled morphology density. First, epitaxial Au-Sr3Al2O6 (SAO) vertically aligned...
Abstract Flexible and wearable sensors show enormous potential for personalized healthcare devices by real‐time monitoring of an individual's health. Typically, a single functional material is selected one sensor to sense particular physical signal while multiple materials will be multi‐mode sensing. Vertically aligned nanocomposites (VANs) have recently demonstrated various combinations novel coupled multifunctionalities that are hard achieve in any single‐phase alone, including multiphase...
NbN thin films are considered as a promising alternative candidate to conventional Al superconducting electrodes for Josephson junction devices, qubits and quantum logic circuits. Herein, by co-growing ferromagnetic Co with NbN, self-assembled NbN-Co vertically aligned nanocomposite (VAN) have been successfully deposited on MgO substrates, in its cubic phase. The obtained VAN metamaterials exhibit epitaxial growth of uniformly dispersed nanoplates. Further physical property characterization...
The discovery of ferroelectric hafnium oxide has spurred great interest in the semiconductor industry, enabled by its complementary metal-oxide-semiconductor compatibility and scalability. However, many questions remain regarding origin phases tunability properties. In this work, we explore influence laser fluence on coercive field (Ec) 10 nm-thick epitaxial rhombohedrally distorted orthorhombic (r-d o) Hf0.5Zr0.5O2 (HZO) films grown pulsed deposition La0.7Sr0.3MnO3-buffered (001) SrTiO3...
ZnO thin films have attracted significant interest in the past decades owing to their unique wide band gap properties, piezoelectric non-linearity and plasmonic properties. Recent efforts been made coupling with secondary phases enhance its functionalities, such as Au-ZnO nanocomposite tunable optical In this work, magnetic nanostructures of Ni are incorporated a vertically aligned (VAN) form couple response complex hybrid metamaterial system. Nickel (Ni) is due ferromagnetic properties...
Multiferroic materials are an interesting functional material family combining two ferroic orderings,
Nanoelectronic devices integrated with functional complex oxides have drawn much attention in recent years. However, due to material and processing compatibility issues, integrating Si-based is challenging, success has been limited. As an example, the Bi3Fe2Mn2Ox (BFMO) supercell system, a single-phase layered oxide made by compositing BiFeO3 BiMnO3, studied for of past decade its unusual Aurivillius structure magnetic ferroelectric properties. most BFMO thin film growth demonstrated on...
Magnetic and ferroelectric oxide thin films have long been studied for their applications in electronics, optics, sensors. The properties of these are highly dependent on the film growth quality conditions. To maximize quality, epitaxial frequently grown single-crystal substrates such as strontium titanate (SrTiO3) lanthanum aluminate (LaAlO3) to satisfy lattice matching minimize defect formation. However, cannot readily be used practical due high cost, limited availability, small wafer...
Multifunctional vertically aligned nanocomposite (VAN) thin films exhibit considerable potential in diverse fields. Here, a BaTiO
The CeO2-based memristor has attracted significant attention due to its intrinsic resistive switching (RS) properties, large on/off ratio, and great plasticity, making it a promising candidate for artificial synapses. However, challenges such as high power consumption poor device reliability hinder broad application in neuromorphic microchips. To tackle these issues, this work, we design novel bilayer (BL) by integrating with Co-CeO2 vertically aligned nanocomposite (VAN) layer compare the...
In ferroelectric and multiferroic-based devices, it is often necessary to grow thicker films for enhanced properties. For certain phases that rely on substrate strain growth, such film growths beyond the typical thin regime could be challenging. As an example, Bi
Bi 2 NiMnO 6 (BNMO) epitaxial thin films with a layered supercell (LSC) structure have emerged as promising single‐phase multiferroic material recently. Because of the required strain state for formation LSC structures, most previous BNMO are demonstrated on rigid oxide substrates such SrTiO 3 and LaAlO . Here, potential grown muscovite mica via van der Waals epitaxy, spotlighting their suitability cutting‐edge flexible device applications is delved. Comprehensive scanning transmission...
Oxide-metal-based hybrid materials have gained great research interest in recent years owing to their potential for multifunctionality, property coupling, and tunability. Specifically, oxide-metal a vertically aligned nanocomposite (VAN) form could produce pronounced anisotropic physical properties, e.g., hyperbolic optical properties. Herein, self-assembled HfO2-Au nanocomposites with ultra-fine Au nanopillars (as fine as 3 nm diameter) embedded HfO2 matrix were fabricated using one-step...
Abstract Metamaterials have gained great research interest in recent years owing to their potential for property tunability, multifunctionality, and coupling. As a new group of self‐assembled thin films, vertically aligned nanocomposite (VAN)‐based hybrid metamaterials been demonstrated with significant anisotropic physical properties broad range tailorability, such as optical anisotropy, magnetic hyperbolic dispersion, enhanced second harmonic generation properties. Herein, ZrO 2 ‐Co high...
Heteroepitaxial metal-oxide vertically aligned nanocomposites (VAN) have piqued significant interest due to their remarkable vertical interfacial coupling effects, strong structural and property anisotropy, potential applications in magnetoelectrics, photocatalysts, optical metamaterials. VANs present a unique pillar-in-matrix structure with uniform but rather random pillar distributions. Achieving well-controlled growth remains major challenge this field. Here, we use BaTiO3 (BTO)-Au as...
Combinatorial growth is capable of creating a compositional gradient for thin film materials and thus has been adopted to explore composition variation mostly metallic alloy films some dopant concentrations ceramic films. This study uses combinatorial pulsed laser deposition method successfully fabricate two‐phase oxide–oxide vertically aligned nanocomposite (VAN) La 0.7 Sr 0.3 MnO 3 (LSMO)‐NiO with variable across the area. The LSMO‐NiO alters morphology VAN through varying nanopillar size...
Abstract Hyperbolic metamaterials (HMM) possess significant anisotropic physical properties and tunability thus find many applications in integrated photonic devices. HMMs consisting of metal dielectric phases either multilayer or vertically aligned nanocomposites (VAN) form are demonstrated with different hyperbolic properties. Herein, self‐assembled HfO 2 ‐Au/TiN‐Au thin films, combining both the VAN designs, demonstrated. Specifically, Au nanopillars embedded TiN layers forming...