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In this paper, a novel Micro Electro Mechanical System (MEMS) based cantilever beam of cross section (400×150×1)μm is presented for the detection of Metronidazole (MZN) which can be used in food processing industry to detect its toxicity level in meat. MZN is a drug that is proven to be carcinogenic if used as feed addictive for cattle breeding or aquafarming. Molecular imprinted Gold cantilever beam...
The sensing ability of Ni-doped SWCNT has been evaluated in presence of isopropanol (IPA) molecule, using density functional theory. The fundamental model for this work has been built on (7, 0) zigzag CNT (Ni-doped) with adsorbed IPA molecule on sidewall of CNT. Charge transfer from nanotube surface to molecule and high adsorption energy made the sensor more conductive after adsorption. Semiconducting...
The research is centered on CdTe nanofilms. The article is aimed at developing innovative primary transducer nanoscale material for semi-conductor sensors, investigating their surface physicochemical properties and evaluation their applicability in carbon monoxide diagnostics. Cadmium telluride nanofilms were obtained by discrete thermal evaporation in vacuum. CdTe nanofilms applicability in gas analysis...
This research proposed the real-time detection of nitrite by employing electrochemical impedance spectroscopy (EIS) technique incorporating an interdigital capacitive sensor. A self-assembled monolayer functionalized the sensing surface with embedded ion-imprinted polymer (IIP) with selectivity for nitrite ions were introduced. Syntheis and characterization of IIP are also explained to validate the...
A taste sensor using a lipid/polymer membrane, i.e., an electronic tongue with global selectivity, has been developed for objective evaluation of the taste of foods and beverages. Moreover, the taste sensor has been also contributing to safety of foods, e.g., the sensor membrane with strong hydrophobicity was used to detect sodium dodecyl sulfate (SDS), a negatively charged surfactant, which was generally...
The extreme resolution of CO2 gas molecules sensing, i.e., detection of single molecule, is reported. The suspended bilayer graphene beam is exploited in order to isolate the sensing part of the device from the substrate noise. Using the electrostatic force, the central part of the suspended beam is pulled-down to bottom metal electrode, which leads to two slanted graphene beams in suspension with...
Sensor elements based on composite films of poly-3, 4-ethylenedioxythiophene combined with nanocrystals of porous silicon and zinc oxide were created. Increasing of nanocomposite electrical resistance due to adsorption of ammonia and ethanol molecules was registered. To evaluate the sensor properties, adsorption sensitivity of obtained composite films was calculated and their dynamic characteristics...
Because of their strong hydrophilicity, nanoporous silica materials are good candidates for humidity sensor applications. We employed molecular modeling to investigate the water behavior when confined in such materials in order to refine the design of the next generation of devices. We focused in this work on the mechanical behavior of those porous silica materials.
A detailed discussion has been made for NH3 affinity towards arsenene sheet. First principle calculations suggest that NH3 get adsorbed on pristine arsenene with weak binding. Doping with Germanium and Selenium respectively decreased and increased energy bnad gap. NBO analysis suggest arsenic (As) valance-p orbital have active participations in binding with Ge and Se. Germanium and Selenium doping...
We report the sensing of carbon dioxide at the extreme resolution, I.e. the detection of an individual molecular adsorption event. We design a novel architecture of suspended graphene device, where comparable strain was introduced in graphene. With it, electrical field can be introduced to graphene surface by applying back-gate voltage to control the adsorption rates, while the collapsing of graphene...
We have described rapid, label free detection of Influenza A viruses with cantilever transducer modified with synthetic sialylglycopolymer as a receptor layer. Surface stress induced by binding of viruses to receptor layer was investigated as analytical signal. Synthetic sialylglycopolymer receptor layer can be implemented in nanoscale strain-gauge cantilever transducers for high sensitive viruse...
The adsorption of H2O molecules on Armchair Graphene Nanoribbons (A-GNR) was theoretically studied using Non Equilibrium Green Function (NEGF) formalism to determine Device Density of States (DDOS), Electrostatic Effective Potential (EDP), Conductivity (G) and Current-Voltage (I–V) characteristics. This paper analyzed the performance of semiconducting graphene nanoribbon (N=10), metallic graphene...
The modelling of a top-gated and bottom-gated Graphene-based Nano Ribbon Field Effect transistor (GNRFET) for sensing of N2O and O2 gases is performed using Sentaurus TCAD and VASP by diffusing the gases over the surface of the Graphene Nano Ribbon (GNR) layer. The Sentaurus model corresponds to that of a doped GNR placed over the gate separated by a thin layer of insulator. From a VASP modelling...
In this paper, interactions of amine group (NH2) with pristine Boron Nitride sheet (BN sheet) has been investigated using a density functional theory based ab-initio approach. Stability and electronic properties have been analysed at distinct positions of NH2 on 2-D Boron Nitrite sheet. It has been observed that on placing the NH2 group at the centre of the hexagon of the BN sheet, it becomes metallic...
In this work, a two-dimensional model is proposed to predict the electrical response of a generic polymer-based chemiresistor. Three different physical phenomena are modeled: fluid dynamics of the carrier fluid; adsorption of the analyte on the sensitive layer; change of electrical resistance due to adsorption.
Microfabricated in-plane bulk acoustic resonators can be configured as gravimetric sensors wherein the mass of surface-bound species is transduced as a shift in the resonant frequency. Using this principle, we examine the adsorption of spherical polystyrene latex particles on the resonator surface by drying particulate laden droplets. Distribution of particles on the surface is governed by the coffee-ring...
This work is dedicated to modeling of adsorption processes in plasmonic sensors. We give a generalization of the Lagergren first order reaction kinetic model to the situations where adsorption takes place in multianalyte environment and every analyte obeys one of the following two rules: either it has a small equilibrium constant or its initial number of particles greatly exceeds the number of corresponding...
In different kinds of surface-based chemical and biological micro/nanosensors, interpretation of the experimentally obtained data is performed based on approximate solutions for the sensor response, valid for the case of single-analyte samples. A question arises whether or not the approximate models used for experimental data fitting in the case of a single analyte are also applicable for multianalyte...
We have developed a theory of the low-frequency noise caused by interaction of the analyte with the active area of chemical and biological sensors. The main result is an analytical expression for the spectral density of the fluctuations of the number of particles adsorbed onto the sensing surface, taking into account the processes of mass transfer through the sensor reaction chamber, adsorption and...
An innovative approach of sensitive and selective detection of trace amounts of chemical threat agents is presented in this work. The technology deals with semiconductor metal oxide gas sensors as a means of express gas detection, coupled with pre-sampling system, which is to improve sensitivity and selectivity of analysis. Examples for H2S, DMMP (phosphor-organic weapons simulant) and UDMH (highly...
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