Electrochemical impedance spectroscopy
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2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
The Conference focuses on all aspects of instrumentation and measurement science andtechnology research development and applications. The list of program topics includes but isnot limited to: Measurement Science & Education, Measurement Systems, Measurement DataAcquisition, Measurements of Physical Quantities, and Measurement Applications.
ISSCC is the foremost global forum for solid-state circuits and systems-on-a-chip. The Conference offers 5 days of technical papers and educational events related to integrated circuits, including analog, digital, data converters, memory, RF, communications, imagers, medical and MEMS ICs.
2020 IEEE Photovoltaic Specialists Conference (PVSC)
Promote science and engineering of photovoltaic materials, devices, systems and applications
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
The Transactions on Biomedical Circuits and Systems addresses areas at the crossroads of Circuits and Systems and Life Sciences. The main emphasis is on microelectronic issues in a wide range of applications found in life sciences, physical sciences and engineering. The primary goal of the journal is to bridge the unique scientific and technical activities of the Circuits and Systems ...
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Provides leading edge information that is critical to the creation of reliable electronic devices and materials, and a focus for interdisciplinary communication in the state of the art of reliability of electronic devices, and the materials used in their manufacture. It focuses on the reliability of electronic, optical, and magnetic devices, and microsystems; the materials and processes used in the ...
Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.
IEEE Transactions on Instrumentation and Measurement, 2000
Electrochemical impedance spectroscopy (EIS) is recognized to be a powerful and noninvasive technique to test the integrity of protective coatings on memorials, but commercial EIS systems are rather costly though versatile devices. This paper describes a low cost and portable EIS system that is based on a compact digital signal processor (DSP) board and embeds the potentiostatic function so that ...
IEEE Transactions on Magnetics, 2009
We measured tunneling magnetoresistance (TMR) in a magnetic tunnel junction as a function of temperature. We used surface plasmon resonance spectroscopy (SPRS)-one of the most useful tools in the analysis of dielectric function in a thin tunneling barrier-to study the correlation of AlOxbarrier quality with the temperature dependent behavior of the TMR ratio. The experimental SPRS analysis suggests that the ...
2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2008
An atypical enhancement of both the dielectric properties and the static (dc) conductivity in polyimide (PI) films has been observed using isothermal dielectric relaxation spectroscopy at 300degC under air atmosphere during short-term thermal aging (up to 200h). Simultaneously, an increase of the dielectric strength of PI is observed. Despite a close similarity with the typical electrical signature of the crystallization ...
10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256), 1999
Properties of series of polyurethane/polypyrrole composite films were investigated by d.c. conductivity, dielectric spectroscopy and tensile strength techniques. A dependence of the physical properties of the composite films on the polyurethane structure, the nature of the oxidizing agent and the polypyrrole content was observed comparatively with the untreated polyurethane cationomer films. Insertion of polypyrrole increases the d.c. conductivity with about ...
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2004
Iridium oxide films formed by electrochemical activation of iridium metal (AIROF) or by electrochemical deposition (EIROF) are being evaluated as low- impedance charge-injection coatings for neural stimulation and recording. Iridium oxide may also be deposited by reactive sputtering from iridium metal in an oxidizing plasma. The characterization of sputtered iridium oxide films (SIROFs) as coatings for nerve electrodes is reported. ...
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Electrochemical impedance spectroscopy (EIS) is recognized to be a powerful and noninvasive technique to test the integrity of protective coatings on memorials, but commercial EIS systems are rather costly though versatile devices. This paper describes a low cost and portable EIS system that is based on a compact digital signal processor (DSP) board and embeds the potentiostatic function so that it can be used without requiring an external potentiostat. The software that runs on the DSP is designed to analyze the electrochemical impedance only in a reduced frequency range in order to produce a simple corrosion alert result. The device is equipped with a digital interface and can be connected to a personal computer to carry out a complete frequency analysis and perform a more complex data processing.
We measured tunneling magnetoresistance (TMR) in a magnetic tunnel junction as a function of temperature. We used surface plasmon resonance spectroscopy (SPRS)-one of the most useful tools in the analysis of dielectric function in a thin tunneling barrier-to study the correlation of AlOxbarrier quality with the temperature dependent behavior of the TMR ratio. The experimental SPRS analysis suggests that the decrease of the TMR ratio starting at 150 K is caused by residual Al metallic defects distributed within the insulating AlOxbarrier. We checked this result by measuring the junction resistances in parallel and antiparallel states.
An atypical enhancement of both the dielectric properties and the static (dc) conductivity in polyimide (PI) films has been observed using isothermal dielectric relaxation spectroscopy at 300degC under air atmosphere during short-term thermal aging (up to 200h). Simultaneously, an increase of the dielectric strength of PI is observed. Despite a close similarity with the typical electrical signature of the crystallization phenomenon occurring in semi-crystalline polymers, DSC measurements have not revealed the presence of an exothermic crystallization peak in PI up to 500degC thus denying this assumption. In this paper, a cross-linking reaction under oxidant atmosphere is therefore proposed for explaining such electrical improvements. Indeed, oxygen diffusion in the polymers' bulk is generally followed by the formation of links between macromolecular chains leading the molecular and charge motions more difficult. This phenomenon, inducing usually an enhancement of the electrical and mechanical properties, is also supported by FTIR chemical changes of PI during aging and theoretical cross-linking mechanisms in presence of oxygen.
Properties of series of polyurethane/polypyrrole composite films were investigated by d.c. conductivity, dielectric spectroscopy and tensile strength techniques. A dependence of the physical properties of the composite films on the polyurethane structure, the nature of the oxidizing agent and the polypyrrole content was observed comparatively with the untreated polyurethane cationomer films. Insertion of polypyrrole increases the d.c. conductivity with about six magnitude orders. Dielectric relaxation spectra are slightly affected by the oxidizing agent but more influenced by the polypyrrole content. Tensile strength characteristics such as tensile stress and elongation at break decrease by incorporation of the polypyrrole. These effects were attributed to enhanced phase mixing by electrostatic interactions of the polyurethane cationomer with oxidizing agents and polypyrrole.
Iridium oxide films formed by electrochemical activation of iridium metal (AIROF) or by electrochemical deposition (EIROF) are being evaluated as low- impedance charge-injection coatings for neural stimulation and recording. Iridium oxide may also be deposited by reactive sputtering from iridium metal in an oxidizing plasma. The characterization of sputtered iridium oxide films (SIROFs) as coatings for nerve electrodes is reported. SIROFs were characterized by cyclic voltammetry, electrochemical impedance spectroscopy, and potential transient measurements during charge-injection. The surface morphology of the SIROF transitions from smooth to highly nodular with increasing film thickness from 80 nm to 4600 nm. Charge-injection capacities exceed 0.75 mC/cm/sup 2/ with 0.75 ms current pulses in thicker films. The SIROF was deposited on both planar and non-planar substrates and photolithographically patterned by lift-off.
This paper presents a polymer cell chip integrated with interdigitated array electrodes (IDA) and a planar cadmium (Cd) micro sensor for on-chip monitoring of cell culture and performing Cd cytotoxicity test of human rhabdomyosarcoma (HR) cells. HR cells were maintained in static culture on the cyclic olefin copolymer (COC) chip for up to seven days, and the cellular behavior was characterized using IDA by electrochemical impedance spectroscopy. A microfabricated Cd sensor with bismuth working electrode was adapted for in situ Cd sensing when cells were exposed to Cd at different concentrations, and the corresponding Cd cytotoxicity was monitored.
Complex dielectric function ε(&3x003C9;) of single-wall carbon nanotubes (SWNTs) is determined by terahertz time-domain spectroscopy from 0.2 to 20 THz. Reε(ω) exhibits extremely large and positive value at low frequency, indicating the response of small gap SWNTs.
Dielectric spectroscopy measurements below 1 Hz are often dominated by "conduction-like" effects. For this reason, they often appear to be dismissed as being of little interest. In this paper two "sub-hertz" responses are considered that give insights into the insulating systems concerned. The first system is that of cross-linked polyethylene, taken from a power cable system. Measurements at temperatures between 60 C and close to melting at 100 C show a change in characteristic from a percolation process to a "true" DC conduction at close to the melting point. Using DC conductivities, it appears to be possible to show whether the cable has been subjected to thermo-electric ageing. This might give insights into where the conduction and hence the ageing in the XLPE is occurring. The second system is an epoxy composite. By considering the sub-hertz response, it is possible to demonstrate the effect of the interface between the filler and the epoxy matrix. In this system, ageing, resulting in delamination between the glass fiber filler and the epoxy, is clearly detected by sub-hertz dielectric spectroscopy. This process is likely to be facilitated by the presence of water, which is known to lead to mechanical failure in such systems, and which can also be detected by "sub- hertz" dielectric spectroscopy. The implications for nano-dielectrics are then briefly considered.
We have developed and implemented advanced diagnostics features for magnetic flowmeters to measure the medium conductivity as an important process parameter and coating on electrodes or liner, which disturbs the flow measurement. The electrode-electrolyte interface (Helmholtz or double layer) is a major obstacle to determine the conductivity directly from the impedances between electrodes at low frequencies. The impedance matrix of the multi- electrode transducer was measured using impedance spectroscopy and different electrochemical components could be identified. The measurements were verified in numerical field simulations. The results have been used to derive a lumped model of the transducer. Coating is found to have an effect on the electrode- electrolyte interface, whereas conductivity can be determined from the bulk resistances. This served as the basis for a successful implementation of the diagnostics function in an embedded microcontroller system.
Dielectric spectroscopy is a powerful tool in the investigation of dipolar and conduction in electrical insulating materials. In particular, the localisation of space charges at crystalline - amorphous interfaces in a semicrystalline polymer, such as low density polyethylene LDPE, provides on internal field which could be unfavourable to the insulating properties of the polymer. A physical displacement of space charges through the clusters and structural defects can be detected in the low frequency region. Changes in the real and imaginary parts of the complex permittivity correspond ot changes in the bulk capacitance and conductance of the polymer. In this work we have presented results of dielectric studies in semicristalline polyethylene low density by means of dielectric relaxation spectroscopy (DRS) in frequency range 10<sup>-3</sup> - 10<sup>6</sup> Hz and temperature between -60 and 70degC In this study a relaxation is observed at high frequencies as a large peak in the domain 1 Hz - 10 kHz in the plot of the imaginary part of dielectric permittivity epsiv* (omega) and in the plot of the loss factor Tandelta(omega). An important increasing in values of epsiv" and Tandelta at low frequencies and high temperature is observed. Also it was noted that the effect of electrical conductivity causes an important increasing in the index of losses epsiv"(omega). The dielectric permittivity epsiv' presents a gradual decrease with increasing frequency and increasing temperature. This feature is masked by high index losses epsiv" values due to DC conductivity.These results confirm that the step in the permittivity epsiv'(omega) is due to conductivity current relaxation.
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