A5069865883- Graphene research and applications
- Carbon Nanotubes in Composites
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Boron and Carbon Nanomaterials Research
- Fullerene Chemistry and Applications
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Molecular Junctions and Nanostructures
- Graphene and Nanomaterials Applications
- Diamond and Carbon-based Materials Research
- Advanced Photocatalysis Techniques
- Nanopore and Nanochannel Transport Studies
- Gas Sensing Nanomaterials and Sensors
- Nanotechnology research and applications
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Fiber-reinforced polymer composites
- ZnO doping and properties
- Quantum and electron transport phenomena
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Electrocatalysts for Energy Conversion
Pennsylvania State University
2016-2025
Toronto Metropolitan University
2025
Universidad Peruana Cayetano Heredia
2024
Shinshu University
2015-2024
Ōtani University
2013-2024
Nagano University
2014-2024
Argonne National Laboratory
2021-2023
Park University
2014-2023
Center for Nanoscale Materials
2021-2023
National Institute for Materials Science
2004-2021
The isolation of graphene in 2004 from graphite was a defining moment for the "birth" field: two-dimensional (2D) materials. In recent years, there has been rapidly increasing number papers focusing on non-graphene layered materials, including transition-metal dichalcogenides (TMDs), because new properties and applications that emerge upon 2D confinement. Here, we review significant advances important developments materials "beyond graphene". We provide insight into theoretical modeling...
Individual monolayers of metal dichalcogenides are atomically thin two-dimensional crystals with attractive physical properties different from those their bulk counterparts. Here we describe the direct synthesis WS2 triangular morphologies and strong room-temperature photoluminescence (PL). The Raman response as well luminescence a function number S–W–S layers is also reported. PL weakens increasing due to transition band gap in monolayer indirect multilayers. edges exhibit signals...
The Raman scattering of single- and few-layered WS2 is studied as a function the number S-W-S layers excitation wavelength in visible range (488, 514 647 nm). For three wavelengths used this study, frequency A1g(Γ) phonon mode monotonically decreases with layers. single-layer WS2, 514.5 nm laser generates second-order resonance involving longitudinal acoustic (LA(M)). This results from coupling between electronic band structure lattice vibrations. First-principles calculations were to...
CONSPECTUS: In the wake of discovery remarkable electronic and physical properties graphene, a vibrant research area on two-dimensional (2D) layered materials has emerged during past decade. Transition metal dichalcogenides (TMDs) represent an alternative group 2D that differ from semimetallic character graphene. They exhibit diverse depend their composition can be semiconductors (e.g., MoS2, WS2), semimetals WTe2, TiSe2), true metals NbS2, VSe2), superconductors NbSe2, TaS2). The TMDs also...
▪ Abstract This account reviews the discovery, synthesis, properties, and latest research advances of carbon nanotubes developed over past 12 years. Because their remarkable electronic mechanical are unique exciting. The field has been rapidly, number publications per year is increasing almost exponentially. Various technological applications likely to arise using for fabrication flat panel displays, gas storage devices, toxic sensors, Li + batteries, robust lightweight composites,...
Two-dimensional transition metal dichalcogenides (TMDs), an emerging family of layered materials, have provided researchers a fertile ground for harvesting fundamental science and emergent applications. TMDs can contain number different structural defects in their crystal lattices which significantly alter physico-chemical properties. Having be either detrimental or beneficial, depending on the targeted application. Therefore, comprehensive understanding is required. Here we review...
Crossing single-walled carbon nanotubes can be joined by electron beam welding to form molecular junctions. Stable junctions of various geometries are created in situ a transmission microscope. Electron exposure at high temperatures induces structural defects which promote the joining tubes via cross-linking dangling bonds. The observations supported dynamics simulations show that creation vacancies and interstitials formation involving seven- or eight-membered rings surface between tubes.
Exfoliated 2H molybdenum disulfide (MoS2) has unique properties and potential applications in a wide range of fields, but corresponding studies have been hampered by the lack effective routes to it bulk quantities. This study presents rapid efficient route obtain exfoliated MoS2, which combines fast sonication-assisted lithium intercalation infrared (IR) laser-induced phase reversion. We found that complete MoS2 with butyllithium could be effected within 1.5 h aid sonication. The 1T...
Humidity sensors have been extensively used in various fields, and numerous problems are encountered when using humidity sensors, including low sensitivity, long response recovery times, narrow detection ranges. Using graphene oxide (G-O) films as sensing materials, we fabricate here a microscale capacitive sensor. Compared with conventional the G-O based sensor has sensitivity of up to 37800% which is more than 10 times higher that best one among at 15%-95% relative humidity. Moreover, our...
Graphene is a two-dimensional network in which sp(2)-hybridized carbon atoms are arranged two different triangular sub-lattices (A and B). By incorporating nitrogen into graphene, its physico-chemical properties could be significantly altered depending on the doping configuration within sub-lattices. Here, we describe synthesis of large-area, highly-crystalline monolayer N-doped graphene (NG) sheets via atmospheric-pressure chemical vapor deposition, yielding unique N-doping site composed...
Interest in 2D materials and van der Waals solids is growing exponentially across various scientific engineering disciplines owing to their fascinating electrical, optical, chemical, thermal properties. Whereas the micromechanical exfoliation technique has been adopted for rapid material characterization demonstration of innovative device ideas based on these systems, significant advances have recently made large-scale homogeneous heterogeneous growth materials. This review reflects recent...
We report the use of chemical vapor deposition (CVD) for bulk production (grams per day) long, thin, and highly crystalline graphene ribbons (<20-30 microm in length) exhibiting widths 20-300 nm small thicknesses (2-40 layers). These layers usually exhibit perfect ABAB... stacking as graphite crystals. The structure has been carefully characterized by several techniques electronic transport gas adsorption properties have measured. With this material available to researchers, it should be...
Abstract Few‐layered films of WS 2 , synthesized by chemical vapor deposition on quartz, are successfully used as light sensors. The film samples structurally characterized Raman spectroscopy, atomic force microscopy, scanning electron and high‐resolution transmission microscopy. produced consist few layered sheets possessing up to 10 layers. UV–visible absorbance spectra reveals absorption peaks at energies 1.95 2.33 eV, consistent with the A B excitons characteristic . Current–voltage ( I...
The isolation of few-layered transition metal dichalcogenides has mainly been performed by mechanical and chemical exfoliation with very low yields. In this account, a controlled thermal reduction-sulfurization method is used to synthesize large-area (~1 cm(2)) WS2 sheets thicknesses ranging from monolayers few layers. During synthesis, WOx thin films are first deposited on Si/SiO2 substrates, which then sulfurized (under vacuum) at high temperatures (750-950 °C). An efficient route transfer...
It is a challenge to fabricate graphene bulk materials with properties arising from the nature of individual sheets, and which assemble into monolithic three-dimensional structures. Here we report scalable self-assembly randomly oriented sheets additive-free, essentially homogenous sponge that provide combination both cork-like rubber-like properties. These sponges, densities similar air, display Poisson's ratios in all directions are near-zero largely strain-independent during reversible...
Structural and electronic properties as well the stability of MoS2 nanotubes are studied using density-functional-based tight-binding method. It is found that zigzag ( n,0) exhibit a narrow direct band gap armchair n,n) possess nonzero moderate gap. Interestingly, tubes show small indirect similar to nanotubes. Simulated electron diffraction patterns confirm existence disulphide The structure nanotube tips explained by introducing topological defects which produce positive negative curvature.
Ternary two-dimensional dichalcogenide alloys exhibit compositionally modulated electronic structure, and hence, control of dopant concentration within each individual layer these compounds provides a powerful tool to efficiently modify their physical chemical properties. The main challenge arises when quantifying locating the atoms in order better understand fine-tune desired Here we report synthesis molybdenum disulfide substitutionally doped with broad range selenium concentrations,...
The coalescence of single-walled nanotubes is studied in situ under electron irradiation at high temperature a transmission microscope. merging process investigated the atomic level, using tight-binding molecular dynamics and Monte Carlo simulations. Vacancies induce via zipper-like mechanism, imposing continuous reorganization atoms on individual tube lattices along adjacent tubes. Other topological defects polymerization Coalescence seems to be restricted tubes with same chirality,...