A5051857198- Plasmonic and Surface Plasmon Research
- Orbital Angular Momentum in Optics
- Perovskite Materials and Applications
- Carbon Nanotubes in Composites
- Gas Sensing Nanomaterials and Sensors
- Microfluidic and Bio-sensing Technologies
- Photonic and Optical Devices
- Graphene research and applications
- Advanced Sensor and Energy Harvesting Materials
- Acoustic Wave Resonator Technologies
- Nanowire Synthesis and Applications
- Mechanical and Optical Resonators
- 2D Materials and Applications
- Metamaterials and Metasurfaces Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Acoustic Wave Phenomena Research
- Conducting polymers and applications
- Silicon Nanostructures and Photoluminescence
- Analytical Chemistry and Sensors
- Diamond and Carbon-based Materials Research
- Terahertz technology and applications
- ZnO doping and properties
- Near-Field Optical Microscopy
- Photonic Crystals and Applications
- Electrohydrodynamics and Fluid Dynamics
Tarbiat Modares University
2015-2024
Fachhochschule Kiel
2024
Kiel University
2024
University of Tehran
2003-2023
Amirkabir University of Technology
2018
Conference Board
2018
This work introduces a new two-dimensional (2D) borophene-based (BB) supercapacitor produced by chemical vapor deposition method and used in the facile fabrication of nanosupercapacitors (spin-coating on graphite substrates). Structural properties as-prepared borophene sheets are fully characterized via AFM, HRTEM, FESEM, Raman spectrum 2D is scrutinized discussed, as well electrochemical response fabricated nanosupercapacitors. A high specific capacity (sCap) 350 F g–1 attributed to device...
In this report, the fabrication of vertically aligned carbon nanotube nanoelectrode array (VACNT-NEA) by photolithography method is presented. Electrochemical impedance spectroscopy as well cyclic voltammetry was performed to characterize arrays with respect different diffusion regimes. The fabricated illustrated sigmoidal voltammogram steady state current dominated radial diffusion. VACNT-NEA and high density VACNTs were employed electrochemical glutamate biosensors. Glutamate dehydrogenase...
This study addresses the growing interest in developing new acoustophoresis designs for efficient particle separation, introducing a novel concave–convex electrode design lymphocyte separation. Initially, numerical model was employed and validated against existing experimental results literature with 4% variance, based on finite element method. Furthermore, order to ensure accuracy of performed simulations, mesh independency approach piezoelectric substrate, alongside an investigation into...
We take advantage of a Kretschmann configuration to design plasmonic force switch. It consists prism/Au/SiO2 stack topped by gated graphene sheet, as an electrically active optofluidic particle sorting system. show that using small gate voltage, one can switch the plasmon-wave induced on target particle, and hence its velocity. Simulations electrical tuning electrochemical potential in narrow range ∼65 meV—i.e., equivalent applied voltage ∼4.3 V—the surface plasmons absorb Au plasmons,...
Acoustofluidics is an efficient, label-free, biocompatible, and low-cost technique for manipulating particles in biological medical research. Despite its capabilities, challenges complex patterning bio-particle trapping remain. However, recent advances have improved the acoustofluidic manipulation flexibility by engineered spatially localized acoustic fields. This study proposes surface-coupled resonant modes using surface wave-driven ridges at 9.65 MHz within a conventional channel...
<title>Abstract</title> Two-dimensional perovskites, such as Ruddlesden-Popper exhibit outstanding optical properties and high exciton binding energies but are highly susceptible to degradation under photo- electron-beam exposure. To overcome this limitation, we encapsulate the perovskites with mechanically exfoliated hexagonal boron nitride flakes, forming nitride/perovskite heterostructures. Cathodoluminescence spectroscopy reveals that these heterostructures significantly reduced...
We are proposing tunable plasmonic tweezers, consisting two parallel graphene stripes, which can be utilized to effectively trap and sort nanoparticles. show that by electrostatically tuning the chemical potential of a stripe about 100 meV (equivalent ΔV G ≈ 4.4 V), force switched efficiently, without need switch laser intensity. This enables high speed low power switching with large number cycles. By applying independent appropriate gate bias voltages direction reversed, leads separation...
We are proposing a plasmonic-based optophoresis system that can trap and simultaneously sort count metallic dielectric micro- nano-particles, in simple microfluidic system. The operating principles of the proposed based on particles intrinsic properties modulate induced optical force transmitted power. Particle manipulations, this system, near-field forces exerted by leaky surface plasmons modes, excited gold stripe. Simulations show maximum potential depth sensitivity to trapped PS/Au...
Using a plasmonic graphene ring resonator of resonant frequency 10.38 THz coupled to waveguide, we design lab-on-a-chip optophoresis system that can function as an efficient force switch. Finite difference time domain numerical simulations reveal appropriate choice chemical potentials the waveguide and keeps proposed structure in on-resonance condition, enabling selectively trap nanoparticle. Moreover, change 250 meV potential (i.e., equivalent 2.029 V corresponding applied bias) switches...
Different polymers have been already introduced for passivating the interfacial defects at interface of perovskite and organic hole transport material, meanwhile as an environmental barrier in solar cells (PSCs). Herein, polyvinylcarbazole (PVK) compared to polymethylmethacrylate (PMMA) (Cs 0.05 (MA 0.83 FA 0.17 ) 0.95 Pb(Br I 3 layer CuInS 2 /carbon a low‐cost inorganic hole‐collecting electrode are investigated. By suppressing recombination using PMMA PVK, saturation current density (in...
Branched carbon nanotube (CNT) arrays were synthesized by plasma-enhanced chemical vapour deposition on a silicon substrate. Ni was used as the catalyst and played an important role in realization of branches vertically aligned nanotubes. TiO 2 nanoparticles branched CNTs produced atmospheric pressure followed 500 °C annealing step. Transmission scanning electron microscopic techniques to study morphology /branched CNT structures while x-ray diffraction Raman spectroscopy verify...
We present theoretical and experimental studies of the plasmonic properties hexagonal arrays gold triangles, fabricated by angle-resolved nanosphere lithography method. Our numerical results both show that a change in angle deposition affects size distance between leading to controlled shift their absorption scattering spectra. calculate force exerted on polystyrene particles 650 nm radii numerically while passing above arrays. Simulation presented triangles can operate as efficient tweezers...
Here, we achieved pinhole-free 2D Ruddlesden-Popper Perovskite (RPP) BA2PbI4 layers with close packed crystalline grains dimension of about 30 × µm2, which have been demonstrated to be favorable for optoelectronic applications, such as fast response RPP-based metal/semiconductor/metal photodetectors. We explored affecting parameters in hot casting layers, and proved that oxygen plasma treatment prior plays a significant role achieve high quality polycrystalline RPP at lower cast...
The authors consider the guiding of surface acoustic waves by local resonance band gap a ZnO pillar-based phononic crystal, introducing hollow-cylindrical linear defect. Such defect can be structurally engineered to yield narrow-band modes near middle gap. Moreover, point out frequency tunability this waveguiding behavior, thanks acoustoelectric response ultraviolet illumination. This approach is attractive for designing reconfigurable, high-$Q$ surface-acoustic-wave devices, such as filters...