A5100640275- Material Dynamics and Properties
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Surfactants and Colloidal Systems
- Physics of Superconductivity and Magnetism
- Fullerene Chemistry and Applications
- Multiferroics and related materials
- Theoretical and Computational Physics
- Micro and Nano Robotics
- Boron and Carbon Nanomaterials Research
- Solid-state spectroscopy and crystallography
- Nuclear materials and radiation effects
- High-pressure geophysics and materials
- Advanced Thermodynamics and Statistical Mechanics
- Pickering emulsions and particle stabilization
- Electrostatics and Colloid Interactions
- Perovskite Materials and Applications
- Carbon Nanotubes in Composites
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Iron-based superconductors research
- MXene and MAX Phase Materials
Indian Institute of Science Bangalore
2016-2025
BML Munjal University
2018-2025
Jawaharlal Nehru Centre for Advanced Scientific Research
2012-2024
Punjab Engineering College
2023-2024
Rush University Medical Center
2023-2024
Group for the Analysis of Development
2023
Indira Gandhi Medical College
2008-2023
Himachal Pradesh University
2023
Vellore Institute of Technology University
2021
École Polytechnique Fédérale de Lausanne
2021
Strong electron-phonon interaction which limits electronic mobility of semiconductors can also have significant effects on phonon frequencies. The latter is the key to use Raman spectroscopy for nondestructive characterization doping in graphene-based devices. Using in-situ scattering from single layer MoS$_2$ electrochemically top-gated field effect transistor (FET), we show softening and broadening A$_{1g}$ with electron whereas other active E$_{2g}^{1}$ mode remains essentially inert....
We report resonant Raman scattering of MoS 2 layers comprising single, bi, four and seven layers, showing a strong dependence on the layer thickness. Indirect band gap in bulk becomes direct semiconductor monolayer form. New modes are seen spectra single‐ few‐layer samples which absent bulk. The mode at ~230 cm −1 appears for two, layers. This has been attributed to longitudinal acoustic phonon branch M point (LA(M)) Brillouin zone. ~179 shows asymmetric character sample. asymmetry is...
Toward designing the next generation of resorbable biomaterials for orthopedic applications, we studied poly(ε-caprolactone) (PCL) composites containing graphene. The role, if any, functionalization graphene on mechanical properties, stem cell response, and biofilm formation was systematically evaluated. PCL oxide (GO), reduced GO (RGO), amine-functionalized (AGO) were prepared at different filler contents (1%, 3%, 5%). Although addition nanoparticles to markedly increased storage modulus,...
Metal contacts are a key limiter to the electronic performance of two-dimensional (2D) semiconductor devices. Here, we present comprehensive study contact interfaces between seven metals (Y, Sc, Ag, Al, Ti, Au, Ni, with work functions from 3.1 5.2 eV) and monolayer MoS2 grown by chemical vapor deposition. We evaporate thin metal films onto Raman spectroscopy, X-ray photoelectron diffraction, transmission electron microscopy, electrical characterization. uncover that (1) ultrathin oxidized Al...
Abstract The flow behavior of soft materials below the yield stress can be rich and is not fully understood. Here, we report shear-stress-induced reorganization three-dimensional solid-like formed by closely packed nematic domains surfactant micelles a repulsive Wigner glass anisotropic clay nano-discs having ionic interactions. creep response both systems results in angular velocity fluctuations shearing plate showing large temporal burst-like events that resemble seismic...
Applicability of graphene oxide foams in water remediation.
We report the dynamics of photoinduced carriers in a free-standing MoS2 laminate consisting few layers (1-6 layers) using time-resolved optical pump-terahertz probe spectroscopy. Upon photoexcitation with 800 nm pump pulse, terahertz conductivity increases due to absorption by charge carriers. The relaxation non-equilibrium shows fast as well slow decay channels, analyzed rate equation model incorporating defect-assisted Auger scattering photoexcited electrons, holes, and excitons. time...
X-ray-based analytics are routinely applied in many fields, including physics, chemistry, materials science, and engineering. The full potential of such techniques the life sciences medicine, however, has not yet been fully exploited. We highlight current upcoming advances this direction. describe different methodologies (including those performed at synchrotron light sources X-ray free-electron lasers) their potentials for application to investigate nano–bio interface. discussion is...
We show from experiments and simulations on vibration-activated granular matter that self-propelled polar rods in an elastic medium a substrate turn move towards each other. account for this effective attraction through coarse-grained theory of motile particle as moving point-force density creates strains the reorient other particles. Our measurements confirm qualitatively predicted features distortions created by rods, including ${|x|}^{\ensuremath{-}1/2}$ tail trailing displacement field...
We report a nuclear magnetic resonance (NMR) study of confined water inside ∼1.4 nm diameter single-walled carbon nanotubes (SWNTs). show that the does not freeze even up to 223 K. A pulse field gradient (PFG) NMR method is used determine mean squared displacement (MSD) molecules at temperatures below 273 K, where bulk outside freezes and hence contribute proton signal. varies as square root time, predicted for single-file diffusion in one-dimensional channel. propose qualitative...
Grain boundary (GB) microstructure and dynamics dictate the macroscopic properties of polycrystalline materials. Although GBs have been investigated extensively in conventional materials, it is only recently that molecular simulations shown exhibit features similar to those glass-forming liquids. However, current simulation techniques probe are limited temperatures driving forces much higher than typically encountered atomic experiments. Further, short spatial temporal scales systems...
In this study, a minimum reflection loss of -70 dB was achieved for 6 mm thick shield (at 17.1 GHz frequency) employing unique approach. This accomplished by engineering nanostructures through decoration magnetic nanoparticles (nickel, Ni) onto graphene oxide (GO) sheets. Enhanced electromagnetic (EM) shielding derived selectively localizing the nanoscopic particles in specific phase polyethylene (PE)/poly(ethylene oxide) (PEO) blends. By introduction conducting inclusion (like multiwall...
MoTe2 with a narrow band-gap of ∼1.1 eV is promising candidate for optoelectronic applications, especially the near-infrared photo detection. However, responsivity few layers very small (<1 mA W−1). In this work, we show that layer MoTe2-graphene vertical heterostructures have much larger ∼20 W−1. The trans-conductance measurements back gate voltage on-off ratio transistor to be ∼(0.5–1) × 105. rectification nature source-drain current reveals presence stronger Schottky barrier at...
Abstract Graphene‐based polymer nanocomposites are being studied for biomedical applications. Polymer can be processed differently to generate planar two‐dimensional (2D) substrates and porous three‐dimensional (3D) scaffolds. The objective of this work was investigate potential differences in biological response graphene composites the form 2D 3D Polycaprolactone (PCL) were prepared by incorporating 1% oxide (GO) reduced (RGO). GO increased modulus strength PCL 44 22% respectively, whereas...
Pump-probe microscopy measurements reveal the presence of rapidly propagating phason-phonon modes in an excitonic condensate.
Abstract The layered chalcogenide Ta 2 NiSe 5 has been proposed to host an excitonic condensate in its ground state, a phase that could offer unique platform study and manipulate many-body states at room temperature. However, identifying the dominant microscopic contribution observed spontaneous symmetry breaking remains challenging, perpetuating debate over state properties. Here, using broadband ultrafast spectroscopy we investigate out-of-equilibrium dynamics of demonstrate transient...
Importance Type 2 diabetes (T2D) is the leading cause of kidney disease in US. It not known whether glucose-lowering medications differentially affect function. Objective To evaluate outcomes Glycemia Reduction Approaches Diabetes: A Comparative Effectiveness (GRADE) trial comparing 4 classes added to metformin for glycemic management individuals with T2D. Design, Setting, and Participants randomized clinical was conducted at 36 sites across included adults T2D less than 10 years, a...
The nonlinear flow behavior of a viscoelastic gel formed due to entangled, cylindrical micelles in aqueous solutions the surfactant cetyl trimethylammonium tosilate (CTAT) has been studied. On subjecting system step shear rate lying above certain value, and normal stresses show interesting time dependent behavior. analysis measured series shows existence finite correlation dimension positive Lyapunov exponent, unambiguously implying that dynamics can be described by dynamical with strange...
We show, through experiments and simulations, that geometrically polar granular rods, rendered active by the transduction of vertical vibration, undergo a collective trapping phase transition in presence V-shaped obstacle when opening angle drops below threshold value. propose mechanism accounts qualitatively for transition, based on cooperative reduction angular noise with increasing area fraction. exploit sensitivity to persistence directed motion sort particles statistical properties...
Abstract We report electromagnetic interference (EMI) shielding effectiveness of reduced graphene oxide‐manganese ferrite (RGO‐MnFe2O4) hybrids in presence multiwalled carbon nanotubes (MWCNTs) as conductive filler polyvinylidene fluoride (PVDF) matrix. MnFe2O4 nanoparticles and RGO‐MnFe2O4 were synthesized by a facile one‐step hydrothermal method different PVDF/RGO‐MnFe2O4 composite films containing fixed amount MWCNTs (3 wt%) fabricated solution blending. The samples characterized X‐ray...
We report pressure evolution of charge density wave (CDW) order and the emergence superconductivity (SC) in $1\mathit{T}\text{\ensuremath{-}}{\mathrm{VSe}}_{2}$ single crystal by studying resistance magnetoresistance behavior under high pressure. With increasing quasihydrostatic CDW enhances with its ordering temperature ($\ensuremath{\sim}100\phantom{\rule{4pt}{0ex}}\mathrm{K}$ at ambient P) marginally up to 5 GPa. At higher pressures, CDW-like anomaly increases more rapidly characteristic...