Готові списки джерел за темами / Impedimetric Sensor*

Добірка наукової літератури з теми "Impedimetric Sensor*"

Автор: Grafiati
Опубліковано: 1 квітня 2023

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Статті в журналах з теми "Impedimetric Sensor*"

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Gongi, Wejdene, Maxence Rube, Hafedh Ben Ouada, Hatem Ben Ouada, Ollivier Tamarin, and Corinne Dejous. "Elaboration and Characterization of a New Heavy Metal Sensor Functionalized by Extracellular Polymeric Substances Isolated from a Tunisian Thermophilic Microalga Strain Graesiella sp." Sensors 23, no. 2 (January 10, 2023): 803. http://dx.doi.org/10.3390/s23020803.

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The present study aimed to develop and characterize new heavy metal sensors functionalized by extracellular polymeric substances (EPSs) isolated from a Tunisian thermophilic microalga strain Graesiella sp. The elaborated sensor showed a highly homogeneous character and revealed a microstructural lamellar arrangement, high crystalline nature, and several functional groups. Electrochemical impedance spectroscopy (EIS) and acoustic wave sensing were used as sensing techniques to explore the ability of microalgae-EPS-functionalized sensors to detect cadmium and mercury as heavy metals. For impedimetric measurements, a two-dipole circuit was adopted and showed good-fitted results with a low total error. The acoustic sensor platforms showed good compatibility with EPS in adjacent water. For both EPS-functionalized sensors, metal ions (Cd2+, Hg2+) were successfully detected in the concentration range from 10−10 M to 10−4 M. Impedimetric sensor was more sensitive to Cd2+ at low concentrations before saturation at 10−7 M, while the acoustic sensor exhibited more sensitivity to Hg2+ over the full range. The results highlight a new potential alternative to use microalgae EPSs as a sensitive coating material for the detection of heavy metals. However, its use in a real liquid medium requires further investigation of its selectivity in the presence of other compounds.
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Nakazato, Kazuo. "Chemistry integrated circuit: chemical system on a complementary metal oxide semiconductor integrated circuit." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2012 (March 28, 2014): 20130109. http://dx.doi.org/10.1098/rsta.2013.0109.

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By integrating chemical reactions on a large-scale integration (LSI) chip, new types of device can be created. For biomedical applications, monolithically integrated sensor arrays for potentiometric, amperometric and impedimetric sensing of biomolecules have been developed. The potentiometric sensor array detects pH and redox reaction as a statistical distribution of fluctuations in time and space. For the amperometric sensor array, a microelectrode structure for measuring multiple currents at high speed has been proposed. The impedimetric sensor array is designed to measure impedance up to 10 MHz. The multimodal sensor array will enable synthetic analysis and make it possible to standardize biosensor chips. Another approach is to create new functional devices by integrating molecular systems with LSI chips, for example image sensors that incorporate biological materials with a sensor array. The quantum yield of the photoelectric conversion of photosynthesis is 100%, which is extremely difficult to achieve by artificial means. In a recently developed process, a molecular wire is plugged directly into a biological photosynthetic system to efficiently conduct electrons to a gold electrode. A single photon can be detected at room temperature using such a system combined with a molecular single-electron transistor.
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Jiang, Keren, Hashem Etayash, Sarfuddin Azmi, Selvaraj Naicker, Mahtab Hassanpourfard, Parmiss Mojir Shaibani, Garima Thakur, Kamaljit Kaur, and Thomas Thundat. "Rapid label-free detection of E. coli using antimicrobial peptide assisted impedance spectroscopy." Analytical Methods 7, no. 23 (2015): 9744–48. http://dx.doi.org/10.1039/c5ay01917f.

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4

Petani, Lisa, Valerie Wehrheim, Liane Koker, Markus Reischl, Martin Ungerer, Ulrich Gengenbach, and Christian Pylatiuk. "Systematic assessment of the biocompatibility of materials for inkjet-printed ozone sensors for medical therapy." Flexible and Printed Electronics 6, no. 4 (November 3, 2021): 043003. http://dx.doi.org/10.1088/2058-8585/ac32ab.

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Abstract The biocompatibility of medical sensors is of great importance. In order to prevent harm of the patient during measurement, this aspect must be considered throughout the entire design process. Biocompatibility can be achieved by various methods. For example, the sensor can be encapsulated, only biocompatible materials can be used for the sensor, or anti-inflammatory agents can be applied to the surface of the sensor. In this paper the focus is on sensors fully fabricated from biocompatible materials. Two exemplary inkjet-printed amperometric and impedimetric sensors are systematically assessed regarding their biocompatibility. Both sensors can be used for the measurement of dissolved ozone during oxygen-ozone injection therapy. For the sensors each material is evaluated with respect to the international standard ISO 10993. Overall, many amperometric and impedimetric sensors are fabricated from a small set of materials. The assessment reveals that for this specific application an amperometric sensor consisting of gold and silver nanoparticle inks, inkjet-printed on a polydimethylsiloxane membrane, and passivated with SU-8 ink offers the highest biocompatibility and reaches a good compliance with other important requirements. In addition, biological characterization tests are required for the specific medical application to validate the biocompatibility. From this study, it can be concluded that the findings on biocompatibility can also be transferred to other sensors that are made of the same set of materials but are for other applications. This applies to oxygen, glucose, pH, hydrogen peroxide, sweat lactate, and acetone sensors.
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Hudson, Trevor Q., and Ellis Meng. "A Continuous, Impedimetric Parylene Flow Sensor." Journal of Microelectromechanical Systems 30, no. 3 (June 2021): 456–70. http://dx.doi.org/10.1109/jmems.2021.3067573.

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Chabbah, Taha, Houyem Abderrazak, Radhia Souissi, Patrice Saint-Martin, Herve Casabianca, Saber Chatti, Regis Mercier, et al. "A Sensitive Impedimetric Sensor Based on Biosourced Polyphosphine Films for the Detection of Lead Ions." Chemosensors 8, no. 2 (May 11, 2020): 34. http://dx.doi.org/10.3390/chemosensors8020034.

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In this work, impedimetric sensors were developed for the detection of the four WFD heavy metals Pb2+, Cd2+, Hg2+ and Ni2+, by the modification of a gold electrode with four partially biosourced polyphosphine polymers. These polymers were obtained with satisfactory yields by polycondensation of the bis(4-fluorophenyl)(4-methylphenyl)phosphine sulfide and the bis(4-fluorophenyl)(4-methylphenyl)phosphine oxide using isosorbide or bisphenol A. The chemical structures and number-average molecular weights of the resulting polymers were determined by NMR spectroscopy (1H, 19F, and 31P) and by size exclusion chromatography. Glass transition temperatures varied between 184 and 202 °C depending on the composition of polymers. The bio-based poly(etherphosphine) oxide modified sensor showed better analytical performance than petrochemical based oxide for the detection of Pb2+. A detection limit of 10−10 g/L or 0.5 pM, which is 104 times lower than that of the anodic stripping voltammetric and the potentiometric sensors. A reversibility is obtained through rinsing of the impedimetric sensor with an EDTA solution.
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Rusen, Edina, Aurel Diacon, Alexandra Mocanu, Florica Rizea, Bogdan Bucur, Madalina Petruta Bucur, Gabriel-Lucian Radu, Elena Bacalum, Mihaela Cheregi, and Victor David. "Synthesis and retention properties of molecularly imprinted polymers for antibiotics containing a 5-nitrofuran ring." RSC Advances 7, no. 80 (2017): 50844–52. http://dx.doi.org/10.1039/c7ra10196a.

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Awasthi, Prasoon, Ranjan Mukherjee, Siva Prakasam O Kare, and Soumen Das. "Impedimetric blood pH sensor based on MoS2–Nafion coated microelectrode." RSC Advances 6, no. 104 (2016): 102088–95. http://dx.doi.org/10.1039/c6ra17786g.

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Pal, Nabamita, Gaurab Dutta, Khawlah Kharashi, and Erica Murray. "Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor." Materials 15, no. 3 (February 2, 2022): 1165. http://dx.doi.org/10.3390/ma15031165.

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Composite NOx sensors were fabricated by combining partially and fully stabilized yttria-doped zirconia with alumina forming a composite electrolyte, Y2O3-ZrO2-Al2O3, and strontium-doped lanthanum manganese oxide mixed with gold to form the composite sensing electrode, La0.8 Sr0.2MnO3-Au. A surface chemistry analysis of the composite sensor was conducted to interpret defects and the structural phases present at the Y2O3-ZrO2-Al2O3 electrolyte, as well as the charge conduction mechanism at the LaSrMnO3-Au electrode surface. Based on the surface chemistry analysis, ionic and electronic transport properties, and microstructural features of sensor components, the working principle was described for NOx sensing at the composite sensor. The role of the composite materials on the NOx sensing response, cross-sensitivity to O2, H2O, CO, CO2, and CH4, and the response/recovery rates relative to sensor accuracy were characterized by operating the composite NOx sensors via the impedimetric method. The composite sensors were operated at temperatures ranging from 575 to 675 °C in dry and humidified gas environments with NO and NO2 concentrations varying from 0 to 100 ppm, where the balance gas was N2. It was found that the microstructure of the composite NOx sensor electrolyte and sensing electrode had a significant effect on interfacial reactions at the triple phase boundary, as well as the density of active sites for oxygen reactions. Overall, the composite NOx sensor microstructure enabled a high NOx sensing response, along with low cross-sensitivity to O2, CO, CO2, and CH4, and promoted NO detection down to 2 ppm.
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Imali, D. Yureka, E. Chavin J. Perera, M. N. Kaumal, and Dhammike P. Dissanayake. "Fabrication and characterization of a flexible and disposable impedance-type humidity sensor based on polyaniline (PAni)." RSC Advances 13, no. 10 (2023): 6396–411. http://dx.doi.org/10.1039/d3ra00009e.

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Дисертації з теми "Impedimetric Sensor*"

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Fendri, Ahmed. "Impedimetric Sensor System for Edible Oil Quality Assessment." Universitätsverlag Chemnitz, 2019. https://monarch.qucosa.de/id/qucosa%3A37173.

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The repeated usage of frying oil is hazardous due to the degradation caused by chemical reactions, which happen while heating. The total polar compounds and the free fatty acids are the main two chemical parameters affected by frying. These parameters increase significantly with the use of oil for frying and are reported as reasons for causing serious illnesses like heart diseases. For this purpose, sensor systems for oil quality assessment are necessary. In fact, changes of the composition due to frying leads to variation of its dielectric parameters. This can be measured using a capacitive sensor and the measurement of its impedance change. The main challenge thereby is that the impedance changes are very small and stray capacitances have a big influence on the measurements. In this context, this work proposes a sensor system with high accuracy able to detect the small changes that occur in the resistance and capacitance under influence of stry capacitances. Theoretical and simulation studies are carried out for different cap acitive sensors as well as meas urement procedures of its cornp lex imp edance. The sensor should provide a high sensitivity to relative perrnittivity and the electrical conductiv ity, and at the same time a small size and a high reproducibility. Interdigital electrodes sensor with a suitable design fulfils all these requirements. A deep consideration of stray capacitances is needed to realize an accurate sensor system. For t hese reasons, the design of the measurement circuit is crucial within this work. We propose, a measurernent circuit based on a combinat ion of the method of capacitance to voltage conversion and the phase shift measurement method. By cornbining both rnethods together it is possible to rneasure accurate ly the complex irnpedance of edible oil. Experimental results show that measurement systern is capable to detect small changes of dielectric parameters, which are correlated to the chemical parameters.
Die mehrfach wiederholte Verwendung von Frittieröl ist aufgrund der Qualitätsver­ schlechterung, die während des Erhitzens auftreten durch chemische Reaktionen verursacht wird, gefährlich für die Gesundheit. Die totale polaren Kompon enten und die freien Fettsäuren sind die zwei wichtigsten chemischen Komponenten, die wesentlich durch das Braten beeinflusst werden. Diese Komponenten erhöhen sich signifikant mit der Wiederverwendung von Bratöl und verursachen u. a. ernste Herzkrankheiten. Diese Arbeit zielt darauf hin, ein mobiles, kostengünstiges, einfach zu verwenden­ des Sensorsystem für die Abschätzung der Ölqualität zu entwickeln. Das System charakterisiert die Veränderung der elektrischen Parameter des Öls durch Messung der Änderung seiner komplexen elektrischen Eigenschaft en. In dieser Arbeit wurde ein Sensorelement mit interdigitalen Elektroden entwickelt, der eine hohe Empfindlichkeit auf die relative Permittivität und die elektrischen Leitfähigkeit des Öls hat und dabei einer hohe Reproduzierbarkeit erzielen kann. Es wird ein Messverfahren vorgeschlagen, das auf der Wandlung in einer Spannung und einer Phasenverschiebung basiert. Sowohl durch theoretische Überlegungen als auch durch Simulationen konnte belegt werden, dass die Kombination beider Metho­ den eine akkurate Messung der Komplexem Imped anz hochdielektrischer Materia lien ermöglichen kann. Experiment elle Ergebnisse zeige n, dass das Messsystem in der Lage ist , kleine Änderungen der dielektrischen Parameter zu erfassen, die mit den chemischen Ölparamtern stark korrelieren.
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Kaatz, Miriam. "Impedimetric DNA detection : towards improved detection schemes for sensor integration." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/17890.

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Detection of DNA by electrochemical impedance spectroscopy (EIS) has been reported by many authors and assays have been developed using lab setups. However, as for most detection assay methods there are issues to address to enable the development for the sensor market: Long time-to-result & high complexity for labelled assays and a lack of sensitivity and reproducibility for label-free assays. This work considers two different approaches to address the issues of time-to-result and assay complexity. The first part presents work on achieving rapid sequence-specific electrochemical detection of DNA hybridisation to complementary DNA on an electrode surface. To accomplish assay sensitivity to low DNA target concentrations, a signal amplification strategy is often necessary. One approach is to couple an enzyme to the hybridised target molecules and to deposit insoluble dyes in the subsequent enzymatic reaction, which enhances sensitivity through an increase in the impedance signal in presence of a redox mediator. The time typically taken for this process (20 – 40 min) precludes the use outside lab setups. Therefore, a protocol for sensitive detection in the presence of redox mediator is demonstrated on a practical timescale required for use in sensor applications. Based on these results a model for the fundamental understanding of the amplification reaction is presented which explains the retention of sensitivity at these enhanced timescales. This also enabled further optimisation of the assay for application in single base pair mismatch detection in biologically relevant sequences. Moreover, direct detection of the precipitate formation is demonstrated which enables real-time measurement of the enzymatic reaction without redox agent addition and with enhanced mismatch discrimination. The second part investigates the possibility to detect DNA non-sequence-specifically by non-Faradaic means. This approach aims at reducing assay complexity by establishing whether it is possible to sense the presence of polymeric DNA in solution by measuring changes in the properties of the electrochemical double layer without DNA surface hybridisation. In a sensor setup this approach could be linked to a polymerase chain reaction (PCR) to discriminate polymer from nucleotide monomer and thereby enable PCR progress to be monitored. In this work the response in the electrochemical double layer at the interface of blocked metal electrodes and solutions containing DNA are studied by means of EIS. Blocking layers were applied to the electrode surface to prevent unspecific adsorption of molecules and ions to the metal surface whilst preserving the sensitivity to detection of changes in the double layer. The characteristics of surface blocking layers on disposable electrodes are studied as they are key to understand the double layer properties at a blocked surface. A number of self-assembled monolayers are compared with respect to their temperature stability and their blocking characteristics at different potentials and ion concentrations. This established the basis to study the effect of the presence of, initially, a model polyelectrolyte and, ultimately, DNA on the double layer. Polyelectrolyte detection is successfully shown for the model polyelectrolyte, polyacrylic acid. DNA detection was more challenging and possible causes for deviation from the polyacrylic acid response are discussed.
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Correr, Wagner Rafael. "Development of impedimetric DNA sensor for diagnosis of Human Papillomavirus type 18 infection." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-05032015-144417/.

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Currently, the most common strategy employed to detect DNA sequences is PCR (Polymerase Chain Reaction). Nevertheless, in the last few years research on DNA biosensors has increased significantly. Such sensors represent an alternative to PCR in the detection of specific DNA sequences, once they exhibit fast response, low limits of detection, and require simpler sample preparation. The development of a biosensor for detection of DNA from Human Papillomavirus type 18 is reported. To immobilise DNA probe onto indium-tin oxide (ITO) electrodes, a silanisation was carried out using 3-Aminopropyltryethoxysilane (APTES). Silanisation was studied and optimised using ultra-violet absorption spectroscopy, atomic force microscopy, fluorescence microscopy, and cyclic voltammetry. After immobilisation, the hybridisation with target sequence is detected by changes in surface properties of ITO electrode by Cyclic Voltammetry and Electrochemical Impedance Spectroscopy, using the Ferri-Ferrocyante redox couple. The detection of synthetic target sequence was performed in the range of 12.5 to 100 nM, and 300nM for PCR products. The sensor did not show significative response for non-complementary sequence at 50 nM. This sensor can be applied for fast and low cost detection of HPV genetic material at nanomolar levels.
A estratégia mais empregada atualmente na detecção de sequência de DNA é a PCR (Reação em Cadeira da Polimerase). Contudo, nos últimos anos, a pesquisa em biossensores de DNA tem aumentado significativamente. Estes sensores representam uma alternativa a PCR na detecção de sequências específicas de DNA, uma vez que exibem resposta rápida, baixos limites de detecção e requerem preparação simples da amostra. Nesta dissertação descrito o desenvolvimento de um biossensor para a detecção do DNA do Papilomavirus Humano tipo 18. A fim de imobilizar a sequência de captura de DNA em eletrodos de óxido de estanho e índio (ITO), realizou-se uma silanização usando 3-Aminopropiltrietoxisilano (APTES). A reação de silanização foi estudada e otimizada através das técnicas de Espectroscopia de Absorção Ultravioleta, Microscopia de Força Atômica, Microscopia de Fluorescência e Voltametria Cíclica. Após a imobilização, a hibridização com a sequência alvo é detectada através de alterações nas propriedades de superfície do eletrodo através de Voltametria Cíclica e Espectroscopia de Impedância Eletroquímica, usando o par redox Ferri-ferrocianeto. A detecção da sequência alvo sintética foi realizada no intervalo de 12.5 a 100 nM, e para o produto de PCR, 300 nM. O sensor não demonstrou resposta significativa para sequência não complementar a 50 nM. Este sensor pode ser aplicado na detecção rápida e de baixo custo de material genético do HPV a níveis nanomolares.
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Barreiros, dos Santos Marília. "Development of a multi-electrode impedimetric biosensor: detection of pathogenic bacteria and mycotoxins." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284584.

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This thesis aims the development of a multi-electrode platform with applications on different biosensing fields: (i) detection of pathogenic bacteria E.coli O157:H7 and (ii) detection of the mycotoxin Ochratoxin A. For most label-free biosensors, including impedimetric biosensors, the principal limitation on multiplexing arises from the affinity step. Therefore, a great part of the research work described here deals with the characterization, optimization and evaluation of different functionalization strategies for biosensing. These surface functionalization strategies developed here are applied for the final development and fabrication of the multi­electrode biosensor. In Chapter 2, we take advantage of the outstanding properties of indium tin oxide (ITO) material for the development of an ITO-based immunosensor for detecting pathogenic E. coli O157:H7 bacteria. The sensor build-up consisted on a simple, efficient and direct covalent binding of anti-E. coli O157 antibodies onto the ITO substrates. The functionalization methodology was fully characterized by multiple techniques, showing the specific binding of E. coli O157:H7 to the antibody­functionalized surface. The detection capacity of the ITO-based immunosensor was finally tested by EIS and a novel highly sensitive and selective sensor was obtained. In Chapter 3, we develop a gold-based electrochemical immunosensor for the detection of pathogenic E. coli O157:H7 bacteria. Gold is bio-compatible, can be easy obtained and it is easy to pattern using photolithography. In order to enhance the sensor performance, the functionalization protocol was optimized and antibodies were immobilized onto gold electrodes following two different strategies. Both functionalization strategies were evaluated and characterized by several techniques and the strategy showing better antibody immobilization was selected for the development of a highly sensitive label-free immunosensor. The immunosensor showed a very low limit of detection and low interference with other pathogenic bacteria. In Chapter 4, we take advantage of the functionalization strategies developed in the previous chapter 3 to develop a miniaturized multi-electrodes array for the detection of pathogenic bacteria. The multi-electrodes were fabricated in gold and consisted of multiple equally independent electrodes. This allowed high-throughput and independent experiments, in parallel and under the same experimental conditions. Multi-electrodes were fabricated by standard photolithography techniques and characterized by several surface analysis and electrochemical techniques, confirming the quality of the fabrication process. We demonstrated the biosensing capabilities of the multi­electrode platform for the detection of pathogenic bacteria using different bioreceptors, including antibodies and antimicrobial peptides. In Chapter 5, we applied the multi-electrodes platform for the development of an aptamer­based sensor for the detection of mycotoxins. We focused on the specific case of ochratoxin A (OTA), one of the most abundant food-contaminating mycotoxins. Two strategies for aptamer immobilization were presented, both based on the hybridization onto the biosensor surface through partially complementary oligonucleotides. Electrochemical techniques were used to characterize all the functionalization steps. The developed multi-sensor was capable to detect OTA concentrations and the promising results obtained prove the successful application of the multi-electrodes strategy for the detection of mycotoxins and the advantages of using multi-electrode platform.
La detección de bacterias patógenas y micotoxinas es la clave para la prevención y la identificación de los problemas relacionados con la salud pública y seguridad alimentaria. En esta tesis hemos desarrollado una nueva plataforma de múltiples electrodos (multi-electrodo) para detección impedimétrica de bacterias patógenas y micotoxinas. Nos hemos centrado en la detección de bacterias E. coli O157: H7, ya que son responsable por brotes de origen alimentario graves. Se han caracterizado y estudiado la influencia de la (bio)interfaz del sensor para el desarrollo de un biosensor altamente sensible. Por esta razón, se probaron diferentes estrategias y materiales (óxido de indio - estaño y oro). Todos los pasos fueron completamente caracterizados por medio de múltiples técnicas y los resultados obtenidos mostraron que los biosensores desarrollados tenían una excelente respuesta en términos de sensibilidad y selectividad. Además, se obtuvieron resultados prometedores usando multi-electrodos. Estos fueron fabricados en oro y consistían en múltiples electrodos iguales e independientes que permiten el alto rendimiento y experimentos en paralelo en las mismas condiciones experimentales. Los multi-electrodos fueron caracterizados por varias técnicas de análisis de la superficie y técnicas electroquímicas, confirmando la calidad del proceso de fabricación. Hemos demostrado las capacidades de biosensores del multi-electrodo para la detección de bacterias patógenas utilizando diferentes bio-receptores, incluyendo anticuerpos y péptidos antimicrobianos. También se aplicaron los multi-electrodos para el desarrollo de sensores basados en aptámeros para la detección de micotoxinas. Nos centramos en concreto en el caso de la ocratoxina A (OTA), una de las más abundantes que contaminan los alimentos. Se presentaron dos estrategias para la inmovilización de aptámeros, ambas basadas en la hibridación de la superficie del biosensor a través de oligonucleótidos parcialmente complementarios. Se utilizaron técnicas electroquímicas para caracterizar todas las etapas de funcionalización. El multi-sensor desarrollado es capaz de detectar concentraciones de OTA y los prometedores resultados obtenidos demuestran la aplicación para la detección de micotoxinas y las ventajas de utilizar multi-electrodos.
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Fendri, Ahmed [Verfasser], Olfa [Akademischer Betreuer] Kanoun, Hamadi [Akademischer Betreuer] Ghariani, Ulrike [Gutachter] Thomas, Olfa [Gutachter] Kanoun, Hamadi [Gutachter] Ghariani, and Faouzi [Gutachter] Derbel. "Impedimetric Sensor System for Edible Oil Quality Assessment / Ahmed Fendri ; Gutachter: Ulrike Thomas, Olfa Kanoun, Hamadi Ghariani, Faouzi Derbel ; Olfa Kanoun, Hamadi Ghariani." Chemnitz : Universitätsverlag Chemnitz, 2020. http://d-nb.info/1219664464/34.

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Akinyeye, Richard Odunayo. "Nanostructured polypyrrole impedimetric sensors for anthropogenic organic pollutants." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5301_1248150815.

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The main aim of this study was to develop a novel strategy for harnessing the properties of electroconductive polymers in sensor technology by using polymeric nanostructured blends in the preparation of high performance sensor devices.

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Su, Jin Jyh. "Integrated low-power interfaces for impedimetric chemical sensors." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54288.

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This thesis presents two interface circuits for impedimetric chemical sensors: one for passive chemical sensors and the other for ChemFETs. Both interfaces were fabricated in 0.35μm BiCMOS technology and provide the same output data rate of 1Hz. The interface for passive impedimetric sensors is reconfigurable for performing either resistance or capacitance measurements and provides a fully digital output with less than 81.8μW power consumption at VDD = 2.5V. The interface features a 176dB resistance dynamic range (31.6Ω-200MΩ, <±0.8% nonlinearity, and >40dB SNR) realized with only two sub-ranges to minimize calibration efforts and a 102dB capacitance dynamic range (0.8-1000pF, <±0.2% nonlinearity, and >40dB SNR). The ChemFET interface is a highly versatile system that can generate a wide range of bias voltages (VG up to 9.74V and VD up to 16.3V depending on the measurement modes) and perform either constant voltage or constant current mode measurement. At maximum rated output (VG = 9.74V, VD = 16.3V, and IDS = 15μA), the interface consumes only 2.02μW at VDD = 3.3V and provides analog readout noise levels of 0.0476μARMS at 10μA and 0.503mVRMS for IDS and VT, respectively. Besides attempting versatile system architectures, detailed noise and efficiency analysis were performed for the passive sensor interface and the ChemFET interface, respectively. The noise analysis suggests that different types of noise (correlated or uncorrelated) dominate the noise performance in different measurement ranges and, thus, noise suppression techniques, such as chopper stabilization, correlated double sampling (CDS), and oversampling/averaging, are applied to adequate parts of the interface system. The efficiency analysis of the boost capacitor charger in the ChemFET interface concludes that applying a moderate pulsewidth (200-300ns) to drive the boost converter yields the best efficiencies for charging a capacitor. Compared to interfaces described in the literature, the proposed interface for passive sensors achieves better versatility and wide dynamic range with less number of sub-ranges and power consumption. The proposed interface for ChemFETs achieves wider voltage supply range at very low power level. In-house fabricated chemical sensors, including passive chemical sensors and ChemFETs, were interfaced with the developed circuits and gas-phase chemical measurements with the systems were demonstrated. The novel passive chemical sensor tested in this thesis employs a multi-functional design, which can be configured into either a chemoresistor or a chemocapacitor; the tested ChemFET employs a bottom-gate TFT structure to allow the semiconducting film to interact with the analytes.
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Hamad, Eyad M. "Impedimetric sensors for label-free point-of-care immunoassay cardiac marker systems." Thesis, University of Ulster, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535154.

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Jacobs, Thomas [Verfasser]. "Miniaturized thermal flow and impedimetric sensors for the inline chemical process analysis in micro-plants / Thomas Jacobs." Aachen : Shaker, 2011. http://d-nb.info/1075437857/34.

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Lin, Chia-Hung, and 林家鴻. "Label-Free Impedimetric Immuno-Sensor for the Detection of Enrofloxacin." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45129911086304126685.

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碩士
國立中興大學
生物產業機電工程學系所
96
Enrofloxacin, that is most extensive approval antibiotic in the fluoroquinolone family, is frequently used to treat and prevent the disease of food-producing animals. To immobilize the specific antibodt for enrofloxacin on an electrode can develop a lable-free immunosensor. The immunosensors were prepared by covalently binding anti-enrofloxacin antibodies onto a 11-mercapto-undecanoic acid (MUA) monolayer with the pretreatment of EDC/NHS activation on a gold electrode. Each modification process for the Au electrodes was investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) in phosphate buffer saline(PBS) solution with Fe(CN)6 3-/4-. The optimal experiment conditions are : (1) MUA modification at 37℃ in 15% RH is more stable, (2) EDC/NHS can activate the most part of MUA after 24 h, (3)antibody immobilized at 37℃ in 15% RH presents stable after 2 h, (4) after 1 h, bovine serum albumin(BSA) blocking can finish, and(5) the nonspecific adsorption can be rinsed out for 10 min in Tween 20. In the equivalent circuit models, one resistor in series with two parallel RC circuits (2R//C) can clearly distinguish the impedance properties of the electrode-membrane and membrane-solution interface, and one resistor in series with one parallel circuit of resistor and capacitor (1R//C) possesses the advantage of simplification and stability of measurement. The optimal experiment conditions promote the limit of detection from 10 ng/ml to 1 pg/ml. The label-free impedance immunosensor supplies a sensitive and simple method for the enrofloxacin detection. In the future, the sensor can be applied to detect low concentration bio-molecule in food safety and clinical medical field.
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Частини книг з теми "Impedimetric Sensor*"

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Yunus, Mohd Amri Md, Ruzairi Abdul Rahim, Sallehuddin Ibrahim, and Shafishuhaza Sahlan. "Impedimetric Sensor for Cooking Oil Discernment Based on Planar Electromagnetic Sensor Array." In Lecture Notes in Electrical Engineering, 423–31. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8484-5_40.

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Bhand, Sunil, and Gautam Bacher. "Impedimetric Sensors in Environmental Analysis: An Overview." In Energy, Environment, and Sustainability, 67–85. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7751-7_4.

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Bratov, Andrey, Sergi Brosel-Oliu, and Natalia Abramova. "Label-Free Impedimetric Biosensing Using 3D Interdigitated Electrodes." In Springer Series on Chemical Sensors and Biosensors, 179–98. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/5346_2017_7.

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4

Zia, A. I., Apeksha Rao, and S. C. Mukhopadhyay. "Molecularly Imprinted Impedimetric Sensing of Phthalates: A Real-Time Assay Technique." In Smart Sensors, Measurement and Instrumentation, 55–79. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21671-3_3.

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Van Gerwen, Peter, Anca Varlan, Guido Huyberechts, Maaike Op De Beeck, Kris Baert, Willy Sansen, Lou Hermans, and Robert Mertens. "Nanoscaled Impedimetric Sensors for Multiparameter Testing of Biochemical Samples." In Microreaction Technology, 289–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72076-5_34.

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Lee, Michael, Abdoullatif Baraket, Monique Sigaud, Ammar Al-Hamry, Nadia Zine, Olfa Kanoun, Joan Bausells, and Abdelhamid Errachid. "Impedimetric Detection of Human Interleukin 10 on Diazonium Salt Electroaddressed Gold Microelectrode Surfaces." In Smart Sensors, Measurement and Instrumentation, 109–21. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71225-9_7.

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7

Steinke, Arndt, Michael Hintz, Stephan Karmann, and Barbara March. "Tool of Impedimetric Based Micro-Sensors for Research and Development of Electronic Components." In Advanced Microsystems for Automotive Applications 2011, 315–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21381-6_30.

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Echabaane, Mosaab, and Chérif Dridi. "Development of An Impedimetric Nanoplatform for Cu(II) Detection Based on Carbon Dots and Chitosan Nanocomposite." In Frontiers in Voltammetry. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.105924.

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In this chapter, an impedemitric sensor based on carbon dots (CDs) and chitosan (CS) nanocomposite for Cu (II) detection has been studied. The synthesized carbon dots were characterized by TEM, FTIR, XRD, UV-visible, and PL. The obtained carbon dot/chitosan/GCE structure was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The behavior, interface processes of GCE/electrolyte, and sensor properties of the studied structures were investigated. In particular, the performance of the proposed impedimetric sensor to Cu ions, such as sensitivity, dynamic range, detection limit, and selectivity, was studied. Subsequently, the proposed sensor was applied for the determination of copper ions in real water samples.
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Hsine, Zouhour, and Rym Mlika. "Novel Sensor Based on Nanocarbon Transducer Functionalized by Iron (III) Porphyrin for the Impedimetric Detection of Bisphenol A." In Bisphenols [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98560.

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In this chapter, an impedimetric response of iron (III) porphyrin (Fe(III)TMPP) functionalized on gold transducer towards the detection of three phenolic compounds entitled bisphenol A (BPA), 2,2′-biphenol and catechol has been studied. The bisphenol A that has revealed the best affinity with Fe(III)TMPP membrane has been chosen as the target analyte. For improved sensitivity of Au/Fe(III)TMPP sensor towards BPA, a facile and efficient Au/RGO nanocarbon transducer based on reduced graphene oxide (RGO) has been prepared and used to support Fe(III)TMPP membrane. The obtained Au/RGO/Fe(III)TMPP structure was characterized by UV–visible (UV–vis) and electrochemical impedance spectroscopy (EIS) measurements, then applied as electrochemical platform for BPA detection. It has been discovered that the Au/RGO nanocarbon transducer has an amplified electron transfer kinetic compared to unmodified Au transducer. The Au/RGO/Fe(III)TMPP structure has showed a better affinity towards BPA with a doubled sensitivity compared to that obtained with Au/Fe(III)TMPP electrode. We demonstrated that the Au/RGO nanocarbon transducer not only enhances the electron transfer ability but also serves as a good template for the attachment of Fe(III)TMPP throughπ-π interaction. This study reveals new high-potential of nanocarbon transducer based on RGO for the conception of electrochemical sensors with high sensitivity and short response time.
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Brosel-Oliu, Sergi, Naroa Uria, Natalia Abramova, and Andrey Bratov. "Impedimetric Sensors for Bacteria Detection." In Biosensors - Micro and Nanoscale Applications. InTech, 2015. http://dx.doi.org/10.5772/60741.

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Тези доповідей конференцій з теми "Impedimetric Sensor*"

1

Schröter, A., G. Gerlach, A. Walther, D. Wersing, K. Fritzsche, and A. Rösen-Wolff. "D8.1 - Detection of Wound Inflammations with Impedimetric Sensors." In SENSOR+TEST Conferences 2011. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2011. http://dx.doi.org/10.5162/sensor11/d8.1.

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Baldwin, A., T. Q. Hudson, E. Yoon, and E. Meng. "A FLEXIBLE, MICROFABRICATED IMPEDIMETRIC FLUID TEMPERATURE SENSOR." In 2018 Solid-State, Actuators, and Microsystems Workshop. San Diego: Transducer Research Foundation, 2018. http://dx.doi.org/10.31438/trf.hh2018.50.

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Panneer Selvam, Anjan, K. M. Vattipalli, and S. Prasad. "Design of a high sensitive non-faradaic impedimetric sensor." In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6346658.

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Zou, Zhiwei, Soo-Hyun Lee, and Chong H. Ahn. "Simultaneous Dielectrophoretic Separation and Impedimetric Detection of Microbeads using Interdigitated Electrodes Array." In TRANSDUCERS '07 & Eurosensors XXI. 2007 14th International Conference on Solid-State Sensors, Actuators and Microsystems. IEEE, 2007. http://dx.doi.org/10.1109/sensor.2007.4300390.

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Oliver, Louise M., P. S. M. Dunlop, J. A. Byrne, I. S. Blair, M. Boyle, K. G. McGuigan, and E. T. McAdams. "An impedimetric sensor for monitoring the growth of Staphylococcus epidermidis." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.260394.

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Oliver, Louise M., P. S. M. Dunlop, J. A. Byrne, I. S. Blair, M. Boyle, K. G. McGuigan, and E. T. McAdams. "An impedimetric sensor for monitoring the growth of Staphylococcus epidermidis." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.4397455.

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Herrmann, J., G. Hagen, J. Kita, R. Moos, F. Noack, and D. Bleicker. "B2.3 Impedimetric NOx Sensor for Exhaust Applications with Internal Lambda Correction." In SMSI 2021. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2021. http://dx.doi.org/10.5162/smsi2021/b2.3.

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Sitkov, Nikita O., Tatiana M. Zimina, and Aleksei V. Soloviev. "Development of impedimetric sensor for E.coli M-17 antibiotic susceptibility testing." In 2018 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus). IEEE, 2018. http://dx.doi.org/10.1109/eiconrus.2018.8317314.

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David, Melinda, Andrei C. Chebac, Miruna G. Chirita, M. J. Carmezim, Catarina Santos, and Monica Florescu. "An Impedimetric Sensor for Levothyroxine Detection towards Point of Care Applications." In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711839.

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Ahmed, Benozir, Christopher F. Reiche, Florian Solzbacher, and Julia Korner. "Investigation of Mechanical Properties of a Smart Hydrogel-Based Impedimetric Bending Sensor Platform." In 2022 IEEE Sensors. IEEE, 2022. http://dx.doi.org/10.1109/sensors52175.2022.9967261.

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