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Showing 1 to 20 of 24 for “"Interdigitated electrodes"”.
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Robustness and repeatability of interdigitated electrodes on a substrate tested in an aqueous environment
Interdigitated electrodes are currently being used as sensing components in microfluidic lab-on-a-chip devices. The Daktari Diagnostics system uses these electrodes to measure the change in impedance of a fluid in an assay chamber. In order to improve quality assurance, a new testing method was …
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Comparison of standard impedance spectroscopy response to aqueous metal ions using plain vs. surface derivatized gold interdigitated electrodes
… with CS2 to anchor on the gold surface of an interdigitated electrode (IDE) through a dithiocarbamate linkage, resulting in significant changes in impedance response in the presence of Cu2+ solutions. However, questions regarding the stability of the primary amine-based dithiocarbamate …
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Development of a PDMS Based Micro Total Analysis System for Rapid Biomolecule Detection
… a micropump, micromixer, magnetic separator and interdigitated electrodes for impedance detection. Three designs of pneumatically actuated PDMS based micropumps were fabricated and tested. Based on the performance test results, one of the micropumps was selected for integration. The experimental …
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A combined microfluidic/dielectrophoretic microorganism concentrator
… for pathogen detection applications. Interdigitated electrodes lining the bottom of the channel use positive dielectrophoretic forces to trap particles. A passive mixer is used to circulate the liquid in the channel, transporting particles to within the trapping region of the …
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Optimizing mixer geometries for dielectrophoretic micro-concentrators
Dielectrophoretic (DEP) force, generated by interdigitated electrodes (IDEs), has been utilized to capture bio-particles for microfluidic concentration. However, due to the localized DEP force, DEP-based ,/ -concentrators usually have shallow channels and thus are operated under low flow rates. In …
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Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions
… was drop coated in its solution phase onto interdigitated electrodes to create a chemiresistive gas sensor. An ultra-low-level detection of NH3 (~>2.26 ppm) was observed by the chemiresistive sensor which was extended to detect acetone and distinguish between their individual transient …
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Electric field-assisted immobilization and alignment of biomolecules
… and alignment of biomolecules on metal electrodes in a simple one-step experiment. Neither modifications of the biomolecule nor of the electrodes were needed. The two major electrokinetic effects that lead to molecule motion in the chosen electrode configurations used were identified as …
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Continuous flow separation techniques for microchemical synthesis
… a soft-lithography microchannel and slanted interdigitated electrodes which provide a transverse force component on the particles. Experimental behavior agreed well with the model predictions, and 4 & 6 micron particles were continuously separated. Liquid-liquid extraction is another useful …
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Design of a micro-interdigitated electrode for impedance measurement performance in a biochemical assay
The performance of interdigitated electrodes for impedance measurements is dependent upon the geometric design of the electrode pattern and can be significantly impacted by manufactured variability or defects. For processes which rely on precise electrode performance, such as the biochemical assay …
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Eis analysis of shear enhanced microfluidic lab-on-a-chip device
… leading to maximum hydrodynamic shear force. Interdigitated electrodes are used to trap multi-walled carbon nanotubes. The principals involved in fabricating such a device can be applied for the detection of some other pharmaceutical molecules. At the same time, CNTs replaced by ZnO and …
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The development of micro-sample electrical impedance analysis for freeze-drying process development
… (NovoControl - Concept 40) using gold interdigitated electrodes on a glass substrate (Micrux – ED-IDE1-AU). The next step involved the selection of relevant frequencies suitable for freeze-drying application and using data fitting software to study the dielectric relaxation process. The …
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Investigations of the optoelectronic behaviour of novel phthalocyanine Langmuir-Blodgett films.
… glass and gold plated glass, and on quartz with interdigitated platinum electrodes. Optical absorption spectra are obtained for the materials, and the linear relation between the absorption intensity and thickness confirmed. The variation in optical absorption with polarisation and angle of …
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Voltage programmable diffraction grating device
… that is patterned with the indium tin oxide electrodes. The pattern of electrodes (interdigitated electrodes) was produced by standard photolithography techniques and the average distance between the electrodes plus the gap between the electrodes (p) that were produced in different devices …
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Semiconductor nanowires: towards enhanced terahertz sources
… and InGaAs NWs are compared, and furthermore, an interdigitated electrodes pattern is designed and fabricated along with InGaAs NWs in between the electrodes in order to investigate the enhancement of THz emission from nanowires under a DC bias field. To the best of our knowledge, this is the very …
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Electrochemical sensors for integration on silicon
… In this thesis, electrochemical methods at micro-electrodes are explored and developed for reagent-free, point-of-care analysis that does not require the need for specialised training. The main goal of the thesis is to develop low-power micro-sensors for point-of-care analysis. To achieve this, …
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Nonlinear Mechanical and Actuation Characterization of Piezoceramic Fiber Composites
… However, actuators with piezoceramic fibers and interdigitated electrodes have risen to the forefront of the intelligent structures community due to their increased actuation capability. However, their fiber-reinforced construction causes them to exhibit anisotropic piezomechanical properties, …
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Synthesis and electrochemical characterization of carbon nanotube forests on metal foils for battery electrodes
… separator. The short diffusion length between electrodes in these thin film configurations increases the power density, but reduces the energy density per footprint. There is a need for increasing energy density per footprint to allow for device minimization. 3-dimensional (3D) batteries offer …
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Electrical Properties of Macro-Fiber Composite Actuators and Sensors
… Conformable, durable and, when equipped with interdigitated electrodes (IDEs), more responsive than regular monolithic devices, PFCs promise to revolutionize the application of piezoelectric materials. Developed by the NASA-Langley Research Center, the Macro-Fiber Composite (MFC) actuator and …
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Organic/carbon nanotubes hybrid thin films for chemical detection.
… hybrids were prepared by drop casting onto interdigitated electrodes and applied as active layers to detect ammonia vapor by measuring electrical resistance changes. Influence of pyrene substituent in the phthalocyanine ring on the hybrid formation and their sensor response has also been …
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Macro-Fiber Composites for Sensing, Actuation and Power Generation
… materials. Additionally the MFC uses interdigitated electrodes that capitalize on the higher d33 piezoelectric coupling coefficient that allow it to produce higher forces and strain than typical monolithic piezoceramic materials. The research presented in this thesis investigates some …
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