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For ion-sensitive devices with SiO2 sensing membrane, the pH sensitivity response has been analyzed when additional functional groups are attached on the SiO2 membrane. A modified Site-Binding model (SBM) and Gouy-Chapman-Stern (GCS) model are used for the theoretical analysis. In the presence of both silanol and amine groups, the highest pH sensitivity can be achieved at a functional group ratio...
We present the first set of VerilogA based models for Magneto-Electric Magnetic Tunnel Junction (ME-MTJ) devices. The compact models have been developed in Verilog-A language and validated by electrical simulations using Cadence Spectre and Schematic Editor. We show simulation results of the ME-MTJ based logic functions i.e. Buffer/Inverter and Majority gate and also show their integrated memory capability...
Acetone has been attracting attention as a human biogas, and it can be detected in the breath of diabetic patients. Therefore, a method for easily measuring the trace amounts of acetone is essential. By focusing on 2,4-dinitrophenylhydrazine (DNPH), which was used in a detection tube, we tried to detect acetone using a sensor element that was produced by impregnating the reagent into porous glass...
Nitrogen monoxide (NO) is an important bio-regulatory molecule, and high concentrations of NO are observed in the air exhaled by patients with asthma. Therefore, chemical sensors that can detect NO via a simple method are required. We focused on 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl (PTIO) as a detection reagent. PTIO oxidizes NO to form nitrogen dioxide (NO2) and is used in passive...
Nanorobotics have been successfully applied to investigate the physical and biomedical properties in the nano scale. As the center piece of nanorobotcis Scanning probe microscope (SPM) has been widely used to measure the topography information of sample surface as well as serving as a manipulation and sensing tool to modify and measure the mechanical and physical properties of sample. However, the...
In this work, we present a system pulse-coupled spin torque nano oscillators (STNOs) as a novel physical implementation of coupled phase oscillators for neuromorphic computing. First, we describe the dynamical properties of pulse-coupled STNOs and explain their phase description. We investigated the system dynamics of fully pulse-coupled STNOs with both static and dynamic synapses through numerical...
A parametric study is performed on the resonance plasmon scattering modes of nanoscale voids within a metallic nano-rod, in terms of the voids' presence, radius, and position, by implementing total-field/scattered-field (TF/SF) in finite-difference time-domain (FDTD). The study is then extended to investigating voids within clusters of metallic nano-rods. A technique is accordingly developed to employ...
In this study, dual pulsed laser ablation was used to prepare composite nanoparticles. Formation of composite nanoparticles was attempted by controlling the amount of time delay between the laser ablation processes, which was accomplished by imposing time delay on the pulse arrival at two different target materials. By monitoring the emission spectra of the laser plume, the relation between the time...
Carrier-spin dynamics in GaAs quantum disks (QD) fabricated by top-down lithography using bio-templates were investigated by means of reflection-type spin-resolved pump-probe spectroscopy. The temperature dependence of electron-spin relaxation time (τs) is found to obey τs ∝ T−3 above 100 K, indicating spin-loss in the barrier due to thermal redistribution of the electron between the QDs and barrier.
Increasing the energy efficiency of magnetic memories has been the focus of many research labs in the past decades. Spin polarized current-based switching, although demonstrating promising results, is still far from the fundamental energy limits of the magnetic logic. In order to take a leap towards the inherent energy advantages of the magnetic logic, the principle of straintronics has been proposed...
We have performed a simplified numerical simulation of the transport properties of a graphene ribbon with an antidot lattice. We have used an envelope function model for graphene, in which a space-dependent mass term approximately reproduces the effect of the regions of the ribbon where the carbon atoms are absent. The envelope function equation has been solved in proper subregions of the ribbon and...
We comparatively study the performance of flexible strain sensors based on carbon nanotube (CNT)-Polydimethylsiloxane (PDMS) nanocomposites with different concentrations of CNTs. The semiconducting CNTs with high intrinsic gauge factor were employed for the sensor fabrications. A percolation network with a lower CNT concentration shows higher resistance changes in response to applied strains compared...
In this paper, an analogue-to-digital convertor (ADC) utilizing the single sided spoof surface plasmon polariton (SS-SSPP) waveguide is presented. The proposed ADC device consists of three stages: first stage is the Mach-Zehnder interferometer (MZI) with two arms which acts as a beam steering device, second is free space propagation stage, and third is the detector arrays to convert analog signal...
Surface effect and nonlocal effect are incorporated into classical Euler beam equation to study the static bending behavior of nanobridges. The generalized Young-Laplace equation and core-shell model are used to model the surface effect. The nonlocal effect is introduced in bending moment equation. Results show that a positive surface tension causes the nanobridge more difficult to bend while the...
In this paper, a theoretical and Monte-Carlo analysis on the percolation behavior of single-walled carbon nanotube (SWNT) network is proposed. For such network structures that are commonly used as the conduction channels of thin-film transistors (TFTs), the dependence of channel resistance on channel length, tube density, and average tube length is carefully studied. The tube-tube contact resistance...
A modeling framework, previously applied to magnetic field sensing in a quantum biological system, is extended here to study the optical and spin dynamics of the diamond nitrogen-vacancy (NV−) center. This points the way towards diamond-based precision magnetometry.
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