A5085278408- Diamond and Carbon-based Materials Research
- Boron and Carbon Nanomaterials Research
- Metal and Thin Film Mechanics
- Graphene research and applications
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- 2D Materials and Applications
- Thermal properties of materials
- Covalent Organic Framework Applications
- Semiconductor materials and devices
- Photonic and Optical Devices
- Terahertz technology and applications
- MXene and MAX Phase Materials
- Advanced Battery Technologies Research
- Photorefractive and Nonlinear Optics
- Ga2O3 and related materials
- Transition Metal Oxide Nanomaterials
- Molecular Junctions and Nanostructures
- Ion-surface interactions and analysis
- Gas Sensing Nanomaterials and Sensors
- Extraction and Separation Processes
- Semiconductor Quantum Structures and Devices
- Mechanical and Optical Resonators
- ZnO doping and properties
- Advancements in Semiconductor Devices and Circuit Design
Rice University
2023-2025
Max Planck Institute for the Structure and Dynamics of Matter
2023
University of Virginia
2023
United States Naval Research Laboratory
2023
DEVCOM Army Research Laboratory
2023
Flatiron Health (United States)
2023
Oak Ridge National Laboratory
2023
Center for Free-Electron Laser Science
2023
United States Army Combat Capabilities Development Command
2023
Cornell University
2023
Covalent organic frameworks (COFs), featuring structural diversity, permanent porosity, and functional versatility, have emerged as promising electrode materials for rechargeable batteries. To date, amorphous polymer, COF, or their composites are mostly explored in lithium-ion batteries (LIBs), while research other alkali metal ion is still infancy. This can be due to the challenges that arise from large volume changes, slow diffusion kinetics, inefficient active site utilization by Na
Here we study the controlled growth of ultrathin molybdenum dioxide (MoO2) flakes, a metallic analogue widely studied transition metal dichalcogenide MoS2. This demonstrates three distinct MoO2 polymorphs (monoclinic, tetragonal, and newly identified hexagonal phase) using physical vapor deposition. Comprehensive characterization through atomic force microscopy, Raman spectroscopy, X-ray photoelectron transmission electron microscopy confirms their unique structures validates observed...
Thin ferroelectric materials hold great promise for compact nonvolatile memory and nonlinear optical optoelectronic devices. Herein, an ultrathin in-plane material that exhibits a giant effect, group-IV monochalcogenide SnSe, is reported. Nanometer-scale domains with ≈90°/270° twin boundaries or ≈180° domain walls are revealed in physical-vapor-deposited SnSe by lateral piezoresponse force microscopy. Atomic structure characterization reveals both parallel antiparallel stacking of...
We used temperature-dependent spark plasma sintering to induce phase transformations of metastable 3D c-BN mixed-phase 3D/2D c-BN/h-BN and ultimately the stable 2D h-BN at high temperature, useful for extreme-temperature technology.
Abstract Redox‐active covalent organic frameworks (COFs) with metal binding sites are increasingly recognized for developing cost‐effective, eco‐friendly electrodes in rechargeable energy storage devices. Here, we report a microwave‐assisted synthesis and characterization of triazine‐based polyimide COF that features dual redox‐active (−C=O from pyromellitic −C=N− triazine) COF@CNT nanocomposites ( COF@CNT‐X , where X=10, 30, 50 wt % NH 2 ‐MWCNT) formed through linking amino‐functionalized...
Abstract To overcome the limitations of commercializing lithium‐ion batteries (LIBs), a one‐step feasible route is reported to prepare hybrid matrix molybdenum oxides (MoO 3‐x , x = 0 and 1) thin film anode. In this direction, electrical conductivity barriers MoO 3 dielectric are by reinforcing conductive 2 via chemical vapor deposition (CVD) route. The intermixed array nanograins nanoflakes grown over stainless‐steel (SS) foil delivers maximum gravimetric capacitance 281 F g −1 specific...
In this Letter, low-temperature (400 °C) chemical vapor deposition-grown boron nitride (BN) was investigated as the gate dielectric for AlGaN/GaN metal–insulator–semiconductor high electron mobility transistors (MISHEMTs) on a Si substrate. Comprehensive characterizations using x-ray photoelectron spectroscopy, reflection energy loss atomic force microscope, high-resolution transmission microscopy, and time-of-flight secondary ion mass spectrometry were conducted to analyze deposited BN...
Abstract As sodium‐ion batteries compete for dominance in the energy storage market, problem arises when using traditional graphitic anodes. Graphitic anodes used Li‐ion do not work well due to limitation of Na‐ion diffusion and intercalation into graphite lattice. It is demonstrated that carbon cones disks, manufactured via scalable pyrolysis hydrocarbons, are viable anode candidates K‐ion batteries. These distinctive pure structures, without any heteroatoms present, show excellent...
Abstract Hard carbon is a promising anode material for next‐generation sodium‐ion batteries (NIBs) due to its high specific capacity, low working potential, and excellent structural stability. This research focuses on synthesizing boron‐ nitrogen‐co‐doped hard (BNHC), which shows enhanced sodium storage properties in half full‐cell configurations. The BNHC prepared using simple, scalable sol‐gel method followed by pyrolysis carbonization. Its 3D nano‐sponge structure provides abundant active...
Abstract The development of high‐quality diamond films is pivotal for driving advances in quantum technology, power electronics, and thermal management. ion implantation lift‐off technique has emerged as a crucial method fabricating with controlled thickness scalable production large‐area wafers. This study the understanding critical interface dynamics during epilayer growth on ion‐implanted commercial substrates. Leveraging high‐resolution cross‐sectional electron microscopy spectroscopic...
Boron nitride (BN) is an exceptional material and among its polymorphs, two-dimensional (2D) hexagonal three-dimensional (3D) cubic BN (h-BN c-BN) phases are most common. The phase stability regimes of these still under debate transformations h-BN/c-BN remain a topic interest. Here, we investigate the 2D/3D nanocomposites show that co-existence two can lead to strong non-linear optical properties low thermal conductivity at room temperature. Furthermore, spark-plasma sintering nanocomposite...
Heterostructures based on ultrawide-bandgap (UWBG) semiconductors $(\mathrm{bandgap}>4.0\phantom{\rule{0.28em}{0ex}}\mathrm{eV})$, such as BN and diamond, hold significant importance for the development of high-power electronics in next generation. However, achieving situ heteroepitaxy BN/diamond or vice versa remains exceptionally challenging due to complex growth kinetics involved. In this work, we grew thin film (100) single-crystal diamonds using pulsed laser deposition investigated...
Abstract Understanding the emergent electronic structure in twisted atomically thin layers has led to exciting field of twistronics. However, practical applications such systems are challenging since specific angular correlations between must be precisely controlled and have single crystalline with uniform atomic ordering. Here, an alternative, simple, scalable approach is suggested, where nanocrystallinetwo‐dimensional (2D) film on 3D substrates yields twisted‐interface‐dependent...
Hexagonal boron nitride (h-BN) is brittle, however, its atomic-scale structural engineering can lead to unprecedented physical properties. Here we report the bulk synthesis of high-density crystalline h-BN solids by using high-temperature spark plasma sintering (SPS) micron size powders. In addition high mechanical strength and ductile response such materials, have obtained anomalous values dielectric constant beyond theoretical limits, thermal conductivity, exceptional neutron radiation...
Fluorite mineral holds significant importance because of its optoelectronic properties and wide range applications. Here, we report the successful exfoliation bulk fluorite ore (calcium fluoride, CaF2) crystals into atomically thin two-dimensional fluoritene (2D using a highly scalable liquid-phase method. The microscopic spectroscopy characterizations show formation (111) plane-oriented 2D CaF2 sheets with exfoliation-induced material strain due to bond breaking, leading changes in lattice...
Recently, unexplored thermally excited trions interaction with THz radiation has garnered significant attention to design highly-efficient communication devices. Moreover, the challenge is play present in...
Boron nitride (BN) is an exceptional material and among its polymorphs, two-dimensional (2D) hexagonal three-dimensional (3D) cubic BN (h-BN c-BN) phases are most common. The phase stability regimes of these still under debate transformations h-BN/c-BN remain a topic interest. Here, we investigate the 2D/3D nanocomposites show that co-existence two can lead to strong non-linear optical properties low thermal conductivity at room temperature. Furthermore, spark-plasma sintering nanocomposite...
Understanding the emergent electronic structure in twisted atomically thin layers has led to exciting field of twistronics. However, practical applications such systems are challenging since specific angular correlations between must be precisely controlled and have single crystalline with uniform atomic ordering. Here, we suggest an alternative, simple scalable approach where nanocrystalline two-dimensional (2D) film on three-dimensional (3D) substrates yield twisted-interface-dependent...
Heterostructures based on ultrawide-bandgap (UWBG) semiconductors (bandgap >4.0 eV), boron nitride (BN) and diamond are important for next-generation high-power electronics. However, in-situ hetero-epitaxy of BN/diamond or vice-versa remains extremely challenging, due to their non-trivial growth kinetics. Here, we have grown BN thin film (100) single crystal by pulsed laser deposition investigated its structural magnetic properties, optical refractive index, thermal conductivity. Structural...