A5009889351- 2D Materials and Applications
- Graphene research and applications
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- MXene and MAX Phase Materials
- Nanowire Synthesis and Applications
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Molecular Junctions and Nanostructures
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Biosensors and Analytical Detection
- Ga2O3 and related materials
- Supramolecular Self-Assembly in Materials
- Semiconductor materials and devices
- Ferroelectric and Negative Capacitance Devices
- Conducting polymers and applications
- Advancements in Battery Materials
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Machine Learning in Materials Science
- Topological Materials and Phenomena
- Chalcogenide Semiconductor Thin Films
Institute for Basic Science
2014-2020
Sungkyunkwan University
2014-2020
Nepal Academy of Science and Technology
2014-2016
Savitribai Phule Pune University
2012
We report that vertically aligned ZnO nanowire arrays (ZnO NWAs) were fabricated on 3D graphene foam (GF) and used to selectively detect uric acid (UA), dopamine (DA), ascorbic (AA) by a differential pulse voltammetry method. The optimized NWA/GF electrode provided high surface area selectivity with detection limit of 1 nM for UA DA. in the oxidation potential was explained gap difference between lowest unoccupied highest occupied molecular orbitals biomolecule set given electrodes. This...
Using density functional theory combined with Monte Carlo (MC) simulations, we show that the two dimensional (2D) MnS2 and MnSe2 sheets are ideal magnetic semiconductors long-range ordering high moments (3 μB per unit cell), where all Mn atoms ferromagnetically coupled, Curie temperatures (TC) estimated for by MC simulations 225 250 K, respectively, which can be further increased to 330 K 375 applying 5% biaxial tensile strains.
Despite numerous studies on two-dimensional van der Waals heterostructures, a full understanding of the charge transport and photoinduced current mechanisms in these structures, particular, associated with depletion/inversion layers at interface remains elusive. Here, we investigate properties prototype multilayer MoS2/WSe2 heterojunction via tunable inversion/depletion layer. A inversion layer was constructed surface WSe2 due to its relatively low doping concentration compared that MoS2,...
Memristors such as phase-change memory and resistive have been proposed to emulate the synaptic activities in neuromorphic systems. However, low reliability of these types memories is their biggest challenge for commercialization. Here, a highly reliable memristor array using floating-gate operated by two terminals (source drain) van der Waals layered materials demonstrated. Centimeter-scale samples (1.5 cm × 1.5 cm) MoS2 channel graphene trap layer grown chemical vapor deposition (CVD) are...
Inspired by natural vein-textured leaves, a 2D nanochanneled graphene film with high packing density and efficient ion transport pathways is proposed to facilitate rate capabilities while maintaining energy density. The nanochannels serve as for diffusion parallel the graphene planes in all-solid-state micro-supercapacitors interdigitated electrode geometry.
Abstract Carrier multiplication (CM) is a process in which high-energy free carriers relax by generation of additional electron-hole pairs rather than heat dissipation. CM promising disruptive improvements photovoltaic energy conversion and light detection technologies. Current state-of-the-art nanomaterials including quantum dots carbon nanotubes have demonstrated CM, but are not satisfactory owing to high-energy-loss inherent difficulties with carrier extraction. Here, we report van der...
One key to improve the performance of advanced optoelectronic devices and energy harvesting in graphene is understand predominant carrier scattering via optical phonons. Nevertheless, low light absorbance yields a limited photoexcited density, hampering hot effect, which strongly correlated phonon bottleneck effect as energy-loss channel. Here, by integrating with monolayer MoS2 possessing stronger absorbance, we demonstrate an efficient interfacial transfer between their heterostructure...
The global outbreak of coronavirus disease (COVID-19) has set an alarming message for the research and discovery new advance technology. This is possible by either combining convectional technology with modern discoveries or initiating avenues using nanotechnology. vast library nanomaterials its integration into can offer various possibilities nanomedicines, nano-biosensors, nanocompounds controlling sever acute respiratory syndrome coronavirus-2 (SARS-CoV-2) other similar virus outbreaks....
Monolayer transition-metal dichalcogenides (1L-TMDs) provide ideal platforms to study light emission using two-dimensionally confined excitons. Recent studies have shown that the exciton emissions of 1L-TMDs can be conveniently modulated by developing heterostructures with zero-dimensional nanoparticles (NPs) or quantum dots. In this study, we synthesized organic semiconducting copper phthalocyanine (CuPc) NPs sizes in range 30–70 nm a re-precipitation method and decorated chemical vapor...
While optical properties of graphene in the visible region are solely defined by frequency-independent fine structure constant, an onset absorption has been observed infrared due to Pauli blocking interband transitions. Here, we report a complete quenching coating with bis(trifluoromethanesulfonyl)amine (TFSA), optically transparent p-type chemical dopant. The Fermi level downshift TFSA doping results enhanced transmission proportional concentration. An method, developed our work, extract...
Photovoltaic device performance of graphene/n-Si Schottky diodes is largely affected by inhomogeneous oxide formation at the interface that suppresses tunneling current injected and photoexcited charges. The accumulated trap charges low induce charge recombination degrade ideality factor diode fill (FF) solar cell. This consequently gives rise to a nonlinear current–voltage (I–V) feature in cells, commonly known as an S-shaped kink, which can be engineered optimizing barrier thickness or...
Abstract Many‐body effect and strong Coulomb interaction in monolayer transition metal dichalcogenides lead to intrinsic bandgap shrinking, originating from the renormalization of electrical/optical bandgap, exciton binding energy, spin‐orbit splitting. This phenomenon has been commonly observed at low temperature requires high photon excitation density. Here, augmented (BGR) MoS 2 anchored on CsPbBr 3 perovskite quantum dots room via charge transfer is presented. The amount electrons...
In the present study, deprotonation of curcumin dye using potassium carbonate was performed successfully, which produced fairly stable deprotonated with a large bathochromic shift in visible light absorption spectrum. The light-harvesting efficiency this investigated TiO2-based sensitized solar cells, exhibited an energy conversion 0.91%, and value is 8.3 times higher than that cells photosensitizer without deprotonation.
Copper indium di-telluride (CuInTe2; CIT) was electrochemically deposited onto tin oxide (ITO) substrate using aqueous medium at various electrodeposition conditions like temperature, pH, stirring rate and concentration of the samples. The resulting thin films were characterized UV-Visible-NIR spectrophotometer, X-ray diffractometer, scanning electron microscopy energy dispersive to find out band gap, structural properties, surface morphology elemental composition in film respectively....
A highly reliable memristor array using floating-gate memory operated by two terminals (source and drain) van der Waals' layered materials is demonstrated Young Hee Lee, Woo Jong Yu, co-workers in article number 1703363. Centimeter-scale samples with MoS2 as a channel graphene trap layer grown chemical vapor deposition are used for fabrication, Al2O3 tunneling barrier. This work opens up the possibility to realize flexible memristors.
Carrier multiplication (CM), a photo-physical process to generate multiple electron-hole pairs by exploiting excess energy of free carriers, is explored for efficient photovoltaic conversion photons from the blue solar band, predominantly wasted as heat in standard cells. Current state-of-the-art approaches with nanomaterials have demonstrated improved CM but are not satisfactory due high loss and inherent difficulties carrier extraction. Here, we report ultra-efficient van der Waals (vdW)...