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Artículos de revistas sobre el tema "Impedimetric Sensor*"

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Autor: Grafiati
Publicado: 1 de abril de 2023

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1

Gongi, Wejdene, Maxence Rube, Hafedh Ben Ouada, Hatem Ben Ouada, Ollivier Tamarin y 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, n.º 2 (10 de enero de 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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2

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, n.º 2012 (28 de marzo de 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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3

Jiang, Keren, Hashem Etayash, Sarfuddin Azmi, Selvaraj Naicker, Mahtab Hassanpourfard, Parmiss Mojir Shaibani, Garima Thakur, Kamaljit Kaur y Thomas Thundat. "Rapid label-free detection of E. coli using antimicrobial peptide assisted impedance spectroscopy". Analytical Methods 7, n.º 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 y Christian Pylatiuk. "Systematic assessment of the biocompatibility of materials for inkjet-printed ozone sensors for medical therapy". Flexible and Printed Electronics 6, n.º 4 (3 de noviembre de 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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5

Hudson, Trevor Q. y Ellis Meng. "A Continuous, Impedimetric Parylene Flow Sensor". Journal of Microelectromechanical Systems 30, n.º 3 (junio de 2021): 456–70. http://dx.doi.org/10.1109/jmems.2021.3067573.

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6

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, n.º 2 (11 de mayo de 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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7

Rusen, Edina, Aurel Diacon, Alexandra Mocanu, Florica Rizea, Bogdan Bucur, Madalina Petruta Bucur, Gabriel-Lucian Radu, Elena Bacalum, Mihaela Cheregi y Victor David. "Synthesis and retention properties of molecularly imprinted polymers for antibiotics containing a 5-nitrofuran ring". RSC Advances 7, n.º 80 (2017): 50844–52. http://dx.doi.org/10.1039/c7ra10196a.

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8

Awasthi, Prasoon, Ranjan Mukherjee, Siva Prakasam O Kare y Soumen Das. "Impedimetric blood pH sensor based on MoS2–Nafion coated microelectrode". RSC Advances 6, n.º 104 (2016): 102088–95. http://dx.doi.org/10.1039/c6ra17786g.

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9

Pal, Nabamita, Gaurab Dutta, Khawlah Kharashi y Erica Murray. "Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor". Materials 15, n.º 3 (2 de febrero de 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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10

Imali, D. Yureka, E. Chavin J. Perera, M. N. Kaumal y Dhammike P. Dissanayake. "Fabrication and characterization of a flexible and disposable impedance-type humidity sensor based on polyaniline (PAni)". RSC Advances 13, n.º 10 (2023): 6396–411. http://dx.doi.org/10.1039/d3ra00009e.

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11

Bai, Huiwen, Kateryna Vyshniakova, Egon Pavlica, Alexandros Yiannikouris, Thirupathi Reddy Yerramreddy, Richard M. Voyles y Robert A. Nawrocki. "Organic Electrochemical, PEDOT:PSS-Based Impedimetric Histamine Sensor". ECS Meeting Abstracts MA2020-01, n.º 29 (1 de mayo de 2020): 2225. http://dx.doi.org/10.1149/ma2020-01292225mtgabs.

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12

Labib, Mahmoud, Anna S. Zamay, Darija Muharemagic, Alexey V. Chechik, John C. Bell y Maxim V. Berezovski. "Aptamer-Based Viability Impedimetric Sensor for Viruses". Analytical Chemistry 84, n.º 4 (febrero de 2012): 1813–16. http://dx.doi.org/10.1021/ac203412m.

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13

Labib, Mahmoud, Anna S. Zamay, Olga S. Kolovskaya, Irina T. Reshetneva, Galina S. Zamay, Richard J. Kibbee, Syed A. Sattar, Tatiana N. Zamay y Maxim V. Berezovski. "Aptamer-Based Impedimetric Sensor for Bacterial Typing". Analytical Chemistry 84, n.º 19 (14 de septiembre de 2012): 8114–17. http://dx.doi.org/10.1021/ac302217u.

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14

Labib, Mahmoud, Anna S. Zamay, Olga S. Kolovskaya, Irina T. Reshetneva, Galina S. Zamay, Richard J. Kibbee, Syed A. Sattar, Tatiana N. Zamay y Maxim V. Berezovski. "Aptamer-Based Viability Impedimetric Sensor for Bacteria". Analytical Chemistry 84, n.º 21 (22 de octubre de 2012): 8966–69. http://dx.doi.org/10.1021/ac302902s.

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15

Zhang, Keying, Na Zhang, Li Zhang, Hongyan Wang, Hongwei Shi y Qiao Liu. "Label-free impedimetric sensing platform for microRNA-21 based on ZrO2-reduced graphene oxide nanohybrids coupled with catalytic hairpin assembly amplification". RSC Advances 8, n.º 29 (2018): 16146–51. http://dx.doi.org/10.1039/c8ra02453g.

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16

Kumar, L. S. Selva, Xiao Wang, Joshua Hagen, Rajesh Naik, Ian Papautsky y Jason Heikenfeld. "Label free nano-aptasensor for interleukin-6 in protein-dilute bio fluids such as sweat". Analytical Methods 8, n.º 17 (2016): 3440–44. http://dx.doi.org/10.1039/c6ay00331a.

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17

Cao, Shuo-Hui, Lun-Hui Li, Wen-Yin Wei, Ye Feng, Wen-Long Jiang, Jiang-Li Wang, Xiao-Ping Zhang, Shu-Hui Cai y Zhong Chen. "A label-free and ultrasensitive DNA impedimetric sensor with enzymatic and electrical dual-amplification". Analyst 144, n.º 14 (2019): 4175–79. http://dx.doi.org/10.1039/c9an00682f.

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18

Pfeffer, Christian, Yue Liang, Helmut Grothe, Bernhard Wolf y Ralf Brederlow. "Towards Easy-to-Use Bacteria Sensing: Modeling and Simulation of a New Environmental Impedimetric Biosensor in Fluids". Sensors 21, n.º 4 (21 de febrero de 2021): 1487. http://dx.doi.org/10.3390/s21041487.

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Conventional pathogenic bacteria-detection methods are lab-bound, time-consuming and need trained personnel. Microelectrodes can be used to recognize harmful microorganisms by dielectric impedance spectroscopy. However, crucial for this spectroscopy method are the spatial dimensions and layout of the electrodes, as the corresponding distribution of the electric field defines the sensor system parameters such as sensitivity, SNR, and dynamic range. Therefore, a variety of sensor models are created and evaluated. FEM simulations in 2D and 3D are conducted for this impedimetric sensor. The authors tested differently shaped structures, verified the linear influence of the excitation amplitude and developed a mathematical concept for a quality factor that practically allows us to distinguish arbitrary sensor designs and layouts. The effect of guard electrodes blocking outer influences on the electric field are investigated, and essential configurations are explored. The results lead to optimized electronic sensors in terms of geometrical dimensions. Possible material choices for real sensors as well as design and layout recommendations are presented.
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19

Patil, U. V., C. S. Rout y D. J. Late. "Impedimetric humidity sensor based on α-Fe2O3 nanoparticles". Advanced Device Materials 1, n.º 3 (3 de julio de 2015): 88–92. http://dx.doi.org/10.1080/20550308.2015.1133101.

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20

Zlatev, Roumen, Margarita Stoytcheva, Benjamin Valdez, Gisela Montero y Lydia Toscano. "Simple impedimetric sensor for rapid lipase activity quantification". Talanta 203 (octubre de 2019): 161–67. http://dx.doi.org/10.1016/j.talanta.2019.05.059.

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21

Ben Messaoud, Najib, Abdoullatif Baraket, Cherif Dridi, Naglaa M. Nooredeen, Mohammed Nooredeen Abbas y Abdelhamid Errachid. "A Highly Sensitive Miniaturized Impedimetric Perchlorate Chemical Sensor". IEEE Sensors Journal 18, n.º 4 (15 de febrero de 2018): 1343–50. http://dx.doi.org/10.1109/jsen.2017.2780445.

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22

Kamal, Ajar, Zhe She, Renu Sharma y Heinz-Bernhard Kraatz. "Interactions of Hg(ii) with oligonucleotides having thymine–thymine mispairs. Optimization of an impedimetric Hg(ii) sensor". Analyst 142, n.º 10 (2017): 1827–34. http://dx.doi.org/10.1039/c7an00238f.

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The present work describes the effect of the number of thymine–thymine mispairs in single strand DNA probes on Hg(ii) interactions and further to develop a highly sensitive DNA based impedimetric sensor for Hg(ii) detection.
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23

Sofer, Zdenek, Daniel Bouša, Jan Luxa, Vlastimil Mazanek y Martin Pumera. "Few-layer black phosphorus nanoparticles". Chemical Communications 52, n.º 8 (2016): 1563–66. http://dx.doi.org/10.1039/c5cc09150k.

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Black phosphorus quantum dots and nanoparticles of a few layer thickness were prepared by easily scalable method; impact electrochemistry of black phosphorus nanoparticles allowed their size determination. Black phosphorus NPs are used as impedimetric methanol vapor sensor.
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24

Antonatos, Nikolas, Vlastimil Mazánek, Petr Lazar, Jiri Sturala y Zdeněk Sofer. "Acetonitrile-assisted exfoliation of layered grey and black arsenic: contrasting properties". Nanoscale Advances 2, n.º 3 (2020): 1282–89. http://dx.doi.org/10.1039/c9na00754g.

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We report herein the successful exfoliation of grey and black arsenic through shear force in acetonitrile. Both exfoliated materials displayed great photothermic effect while black arsenic was shown to be a better candidate for impedimetric volatile organic compounds sensor.
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25

Dzulkurnain, Nurul Akmaliah, Marliyana Mokhtar, Jahwarhar Izuan Abdul Rashid, Victor Feizal Knight, Wan Md Zin Wan Yunus, Keat Khim Ong, Noor Azilah Mohd Kasim y Siti Aminah Mohd Noor. "A Review on Impedimetric and Voltammetric Analysis Based on Polypyrrole Conducting Polymers for Electrochemical Sensing Applications". Polymers 13, n.º 16 (15 de agosto de 2021): 2728. http://dx.doi.org/10.3390/polym13162728.

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Conducting polymers have been widely used in electrochemical sensors as receptors of the sensing signal’s analytes and transducers. Polypyrrole (PPy) conducting polymers are highlighted due to their good electrical conductive properties, ease in preparation, and flexibility of surface characteristics. The objective of this review paper is to discuss the theoretical background of the two main types of electrochemical detection: impedimetric and voltammetric analysis. It also reviews the application and results obtained from these two electrochemical detections when utilizing PPy as a based sensing material in electrochemical sensor. Finally, related aspects in electrochemical sensor construction using PPy will also be discussed. It is anticipated that this review will provide researchers, especially those without an electrochemical analysis background, with an easy-to-understand summary of the concepts and technologies used in electrochemical sensor research, particularly those interested in utilizing PPy as a based sensing material.
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26

Herrmann, Julia, Gunter Hagen, Jaroslaw Kita, Frank Noack, Dirk Bleicker y Ralf Moos. "Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen". Journal of Sensors and Sensor Systems 9, n.º 2 (9 de octubre de 2020): 327–35. http://dx.doi.org/10.5194/jsss-9-327-2020.

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Abstract. Due to tightened emission limits, the efficiency of exhaust gas aftertreatment systems has to be further enhanced. Therefore, inexpensive and robust NOx sensors are required to be installed not only in automotive exhausts, but also in any other kind of combustion-based application. In this contribution, an impedimetric NOx sensor is presented. The impedance of a functional thick film (KMnO4, manufactured in a screen-printing technique on planar alumina substrates) depends selectively on the NOx concentration in the exhaust but shows a dependency on the oxygen concentration. Therefore, an additional temperature-independent resistive oxygen sensor structure was integrated on the same sensor platform. BFAT (BaFe0.74Al0.01Ta0.25O3−δ (BaFe0.74Al0.01Ta0.25O3−δ) was used for this purpose, and the measurement was conducted in the dc resistance mode. It serves not only to determine the oxygen concentration in the exhaust, but also to correct the oxygen dependency of the NOx sensor.
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27

Petani, Lisa, Liane Koker, Janina Herrmann, Veit Hagenmeyer, Ulrich Gengenbach y Christian Pylatiuk. "Recent Developments in Ozone Sensor Technology for Medical Applications". Micromachines 11, n.º 6 (26 de junio de 2020): 624. http://dx.doi.org/10.3390/mi11060624.

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There is increasing interest in the utilisation of medical gases, such as ozone, for the treatment of herniated disks, peripheral artery diseases, and chronic wounds, and for dentistry. Currently, the in situ measurement of the dissolved ozone concentration during the medical procedures in human bodily liquids and tissues is not possible. Further research is necessary to enable the integration of ozone sensors in medical and bioanalytical devices. In the present review, we report selected recent developments in ozone sensor technology (2016–2020). The sensors are subdivided into ozone gas sensors and dissolved ozone sensors. The focus thereby lies upon amperometric and impedimetric as well as optical measurement methods. The progress made in various areas—such as measurement temperature, measurement range, response time, and recovery time—is presented. As inkjet-printing is a new promising technology for embedding sensors in medical and bioanalytical devices, the present review includes a brief overview of the current approaches of inkjet-printed ozone sensors.
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28

Karthick Kannan, Padmanathan y Ramiah Saraswathi. "An impedimetric ammonia sensor based on nanostructured α-Fe2O3". J. Mater. Chem. A 2, n.º 2 (2014): 394–401. http://dx.doi.org/10.1039/c3ta13553e.

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Wu, Bowan, Zhihua Wang, Dongxia Zhao y Xiaoquan Lu. "A novel molecularly imprinted impedimetric sensor for melamine determination". Talanta 101 (noviembre de 2012): 374–81. http://dx.doi.org/10.1016/j.talanta.2012.09.044.

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Bratov, Andrey, Natalia Abramova, Andrey Ipatov y Angel Merlos. "An impedimetric chemical sensor for determination of detergents residues". Talanta 106 (marzo de 2013): 286–92. http://dx.doi.org/10.1016/j.talanta.2012.10.083.

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31

Arshad, Rabia, Amina Rhouati, Akhtar Hayat, Mian Hasnain Nawaz, Muhammad Arfat Yameen, Adnan Mujahid y Usman Latif. "MIP-Based Impedimetric Sensor for Detecting Dengue Fever Biomarker". Applied Biochemistry and Biotechnology 191, n.º 4 (26 de febrero de 2020): 1384–94. http://dx.doi.org/10.1007/s12010-020-03285-y.

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Shi, Liu, Gang Liang, Xiaohong Li y Xinhui Liu. "Impedimetric DNA sensor for detection of Hg2+ and Pb2+". Analytical Methods 4, n.º 4 (2012): 1036. http://dx.doi.org/10.1039/c2ay05758a.

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33

Abramova, Natalia y Andrey Bratov. "Title Monitoring Protamine-Heparin Interactions Using Microcapillary Impedimetric Sensor". Electroanalysis 27, n.º 3 (8 de enero de 2015): 663–69. http://dx.doi.org/10.1002/elan.201400581.

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Radi, Abd‐Elgawad, Alsayed Eissa y Tarek Wahdan. "Molecularly Imprinted Impedimetric Sensor for Determination of Mycotoxin Zearalenone". Electroanalysis 32, n.º 8 (30 de abril de 2020): 1788–94. http://dx.doi.org/10.1002/elan.201900528.

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35

Lu, Tianqi, Ammar Al-Hamry, Junfeng Hao, Yang Liu, Yunze Qu y Olfa Kanoun. "Machine Learning-Based Multi-Level Fusion Framework for a Hybrid Voltammetric and Impedimetric Metal Ions Electronic Tongue". Chemosensors 10, n.º 11 (12 de noviembre de 2022): 474. http://dx.doi.org/10.3390/chemosensors10110474.

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Electronic tongues and artificial gustation for crucial analytes in the environment, such as metal ions, are becoming increasingly important. In this contribution, we propose a multi-level fusion framework for a hybrid impedimetric and voltammetric electronic tongue to enhance the accuracy of K+, Mg2+, and Ca2+ detection in an extensive concentration range (100.0 nM–1.0 mM). The proposed framework extracts electrochemical-based features and separately fuses, in the first step, impedimetric features, which are characteristic points and fixed frequency features, and the voltammetric features, which are current and potential features, for data reduction by LDA and classification by kNN. Then, in a second step, a decision fusion is carried out to combine the results for both measurement methods based on Dempster–Shafer (DS) evidence theory. The classification results reach an accuracy of 80.98% and 81.48% for voltammetric measurements and impedimetric measurements, respectively. The decision fusion based on DS evidence theory improves the total recognition accuracy to 91.60%, thus realizing significantly high accuracy in comparison to the state-of-the-art. In comparison, the feature fusion for both voltammetric and impedimetric features in one step reaches an accuracy of only 89.13%. The proposed hierarchical framework considers for the first time the fusion of impedimetric and voltammetric data and features from multiple electrochemical sensor arrays. The developed approach can be implemented for several further applications of pattern fusion, e.g., for electronic noses, measurement of environmental contaminants such as heavy metal ions, pesticides, explosives, and measurement of biomarkers, such as for the detection of cancers and diabetes.
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Low, Yu Kong, Jianxiong Chan, Gita V. Soraya, Christelle Buffet, Chathurika D. Abeyrathne, Duc H. Huynh, Efstratios Skafidas, Patrick Kwan y Stephen J. Rogerson. "Development of an Ultrasensitive Impedimetric Immunosensor Platform for Detection of Plasmodium Lactate Dehydrogenase". Sensors 19, n.º 11 (29 de mayo de 2019): 2446. http://dx.doi.org/10.3390/s19112446.

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Elimination of malaria is a global health priority. Detecting an asymptomatic carrier of Plasmodium parasites to receive treatment is an important step in achieving this goal. Current available tools for detection of malaria parasites are either expensive, lacking in sensitivity for asymptomatic carriers, or low in throughput. We investigated the sensitivity of an impedimetric biosensor targeting the malaria biomarker Plasmodium lactate dehydrogenase (pLDH). Following optimization of the detection protocol, sensor performance was tested using phosphate-buffered saline (PBS), and then saliva samples spiked with pLDH at various concentrations. The presence of pLDH was determined by analyzing the sensor electrical properties before and after sample application. Through comparing percentage changes in impedance magnitude, the sensors distinguished pLDH-spiked PBS from non-spiked PBS at concentrations as low as 250 pg/mL (p = 0.0008). Percentage changes in impedance magnitude from saliva spiked with 2.5 ng/mL pLDH trended higher than those from non-spiked saliva. These results suggest that these biosensors have the potential to detect concentrations of pLDH up to two logs lower than currently available best-practice diagnostic tools. Successful optimization of this sensor platform would enable more efficient diagnosis of asymptomatic carriers, who can be targeted for treatment, contributing to the elimination of malaria.
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37

Tian, Jian, Jiangan Xie, Zhonghua He, Dui Qin y Xiuxin Wang. "Modeling of an Impedimetric Biosensor with Ultrasonic-Assisted Cell Alignment for the Detection of Yeast". Journal of Sensors 2022 (24 de septiembre de 2022): 1–14. http://dx.doi.org/10.1155/2022/4514218.

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Yeast is an integral part of our environment. The detection of yeast is of great significance in many fields. The impedance-based sensor with interdigital microelectrodes is a promising method to establish a simple and portable detection system. However, the positions of yeast cells greatly influence the impedance variation and eventually the sensitivity of detection. In this study, an impedimetric biosensor with ultrasonic-assisted cell alignment for yeast detection was proposed. In order to verify the feasibility of this biosensor, finite element modeling was conducted using the software COMSOL. The acoustic pressure field and the acoustic radiation force exerted on yeast cells were investigated. Cell positions in the microfluidic channel were determined using the fluid particle tracking module. After that, the impedance between the microelectrodes was calculated. Yeast suspensions with different cell concentrations were used as the tested samples for the simulation. The proposed sensor showed a higher sensitivity than the conventional impedimetric biosensor on which the cells were randomly located. It can be used for the detection of microorganisms. This finite element modeling provided an effective approach for the design of biosensors.
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38

Betatache, Amina, Mohamed Braiek, Jean François Chateaux, Florence Lagarde y Nicole Jaffrezic-Renault. "Molecular Imprinted Poly(Ethyleneco-Vinyl Alcohol) Nanofibers Electrospun on Gold Electrodes for Impedimetric Creatinine Sensing". Key Engineering Materials 543 (marzo de 2013): 84–88. http://dx.doi.org/10.4028/www.scientific.net/kem.543.84.

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In this work, a biomimetic sensor elaborated by direct electrospinning of molecular imprinted poly (ethylene co-vinyl alcohol) (EVOH) onto gold electrodes was proposed for impedimetric creatinine detection. Dimethylsulfoxyde (DMSO) was selected as polymer solvent and creatinine (1% wt) was used as template. In the optimal conditions of fabrication (20% wt EVOH, electrical voltage: 20 kV, collection distance: 30 cm), the sensor response was proportional to log [creatinine concentratio in the 1 fg.L-1-1 μg.L-1 range. We also showed that the sensor could be reused at least three times and that the response of the non imprinted polymer control sensor, prepared the same way but in absence of creatinine, was very low.
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39

Pandey, Chandra Mouli, Gajjala Sumana y Bansi D. Malhotra. "Microstructured Cystine Dendrites-Based Impedimetric Sensor for Nucleic Acid Detection". Biomacromolecules 12, n.º 8 (8 de agosto de 2011): 2925–32. http://dx.doi.org/10.1021/bm200490b.

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40

Singh, Swati, Ankur Kaushal, Sunil Gupta y Ashok Kumar. "Gene Specific Impedimetric Bacterial DNA Sensor for Rheumatic Heart Disease". Indian Journal of Microbiology 57, n.º 1 (22 de septiembre de 2016): 112–15. http://dx.doi.org/10.1007/s12088-016-0620-6.

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41

Lu, Tianqi, Ammar Al-Hamry, José Mauricio Rosolen, Zheng Hu, Junfeng Hao, Yuchao Wang, Anurag Adiraju, Tengfei Yu, Elaine Yoshiko Matsubara y Olfa Kanoun. "Flexible Impedimetric Electronic Nose for High-Accurate Determination of Individual Volatile Organic Compounds by Tuning the Graphene Sensitive Properties". Chemosensors 9, n.º 12 (15 de diciembre de 2021): 360. http://dx.doi.org/10.3390/chemosensors9120360.

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We investigated functionalized graphene materials to create highly sensitive sensors for volatile organic compounds (VOCs) such as formaldehyde, methanol, ethanol, acetone, and isopropanol. First, we prepared VOC-sensitive films consisting of mechanically exfoliated graphene (eG) and chemical graphene oxide (GO), which have different concentrations of structural defects. We deposited the films on silver interdigitated electrodes on Kapton substrate and submitted them to thermal treatment. Next, we measured the sensitive properties of the resulting sensors towards specific VOCs by impedance spectroscopy. We obtained the eG- and GO-based electronic nose composed of two eG films- and four GO film-based sensors with variable sensitivity to individual VOCs. The smallest relative change in impedance was 5% for the sensor based on eG film annealed at 180 °C toward 10 ppm formaldehyde, whereas the highest relative change was 257% for the sensor based on two-layers deposited GO film annealed at 200 °C toward 80 ppm ethanol. At 10 ppm VOC, the GO film-based sensors were sensitive enough to distinguish between individual VOCs, which implied excellent selectivity, as confirmed by Principle Component Analysis (PCA). According to a PCA-Support Vector Machine-based signal processing method, the electronic nose provided identification accuracy of 100% for individual VOCs. The proposed electronic nose can be used to detect multiple VOCs selectively because each sensor is sensitive to VOCs and has significant cross-selectivity to others.
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42

Sepunaru, Lior y Connor Davis. "Impedance Characterization of OECT Behavior in Enzyme-Embedded Conductive Polymer Matrix". ECS Meeting Abstracts MA2022-01, n.º 52 (7 de julio de 2022): 2151. http://dx.doi.org/10.1149/ma2022-01522151mtgabs.

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Latest generation glucose sensors use small-form wearables which provide continuous data. These devices represent the commercial forefront aiming towards personalized and real-time point-of-care biomedical applications. Currently, device lifetimes are limited due to unknown failure mechanisms and ex-situ calibration strategies. Creating a method for in-situ sensor diagnostics will allow a bottom-up approach for designing enzyme-supporting matrixes and calibration strategies inherent to biosensors. To this end, this work seeks to enhance the understanding of performance, stability, and failure mechanisms of biologically based electrochemical transistors using impedimetric measurements. Here, we reveal the fundamental interplay between glucose oxidase loading and the electronic properties of a commonly used PEDOT:PSS matrix as an encapsulating medium. Fundamental to these studies was the discovery of conductivity enhancing strategies compatible with preserving enzyme activity. The enzyme-embedded conductive polymer matrix was used in an organic electrochemical transistor probed via electrochemical impedance (EI) to determine the causes of performance loss over sensor lifetimes. Supporting spectroscopies aided in detailing film morphology and electrical property changes associated with sensor behavior.
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43

Carotenuto, Gianfranco y Luigi Nicolais. "Electrical Method for In Vivo Testing of Exhalation Sensors Based on Natural Clinoptilolite". Coatings 12, n.º 3 (13 de marzo de 2022): 377. http://dx.doi.org/10.3390/coatings12030377.

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Natural substances with a complex chemical structure can be advantageously used for functional applications. Such functional materials can be found both in the mineral and biological worlds. Owing to the presence of ionic charge carriers (i.e., extra-framework cations) in their crystal lattice, whose mobility is strictly depending on parameters of the external environment (e.g., temperature, humidity, presence of small gaseous polar molecules, etc.), zeolites can be industrially exploited as a novel functional material class with great potentialities in sensors and electric/electronic field. For fast-responding chemical-sensing applications, ionic transport at the zeolite surface is much more useful than bulk-transport, since molecular transport in the channel network takes place by a very slow diffusion mechanism. The environmental dependence of electrical conductivity of common natural zeolites characterized by an aluminous nature (e.g., chabasite, clinoptilolite, etc.) can be conveniently exploited to fabricate impedimetric water-vapor sensors for apnea syndrome monitoring. The high mechanical, thermal, and chemical stability of geomorphic clinoptilolite (the most widely spread natural zeolite type) makes this type of zeolite the most adequate mineral substance to fabricate self-supporting impedimetric water-vapor sensors. In the development of devices for medical monitoring (e.g., apnea-syndrome monitors), it is very important to combine these inexpensive nature-made sensors with a low-weight simplified electronic circuitry that can be easily integrated in wearable items (e.g., garments, wristwatch, etc.). Very low power square-wave voltage sources (micro-Watt voltage sources) show significant voltage drops under only a minimal electric load, and this property of the ac generator can be advantageously exploited for detecting the small impedimetric change observed in clinoptilolite sensors during their exposition to water vapor coming from the human respiratory exhalation. Owing to the ionic conduction mechanism (single-charge carrier) characterizing the zeolite slab surface, the sensor biasing by an ac signal is strictly required. Cheap handheld multimeters frequently include a very low power square-wave (or sinusoidal) voltage source of different frequency (typically 50 Hz or 1 kHz) that is used as a signal injector (signal tracer) to test audio amplifiers (low-frequency amplifies), tone control (equalizer), radios, etc. Such multimeter outputs can be connected in parallel with a true-RMS (Root-Mean-Square) ac voltmeter to detect the response of the clinoptilolite-based impedimetric sensors as voltage drop. The frequency of exhalation during breathing can be measured, and the exhalation behavior can be visualized, too, by using the voltmeter readings. Many handheld multimeters also include a data-logging possibility, which is extremely useful to record the voltage reading over time, thus giving a time-resolved voltage measurement that contains all information concerning the breathing test. Based on the same principle (i.e., voltage drop under minimal resistive load) a devoted electronic circuitry can also be made.
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44

Chakraborty, Titisha, Munmun Das, Chan-Yu Lin, Yen Su, Bing Yuan y Chyuan-Haur Kao. "ZIF-8 Nanoparticles Based Electrochemical Sensor for Non-Enzymatic Creatinine Detection". Membranes 12, n.º 2 (28 de enero de 2022): 159. http://dx.doi.org/10.3390/membranes12020159.

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There is a consistent demand for developing highly sensitive, stable, cost-effective, and easy-to-fabricate creatinine sensors as creatinine is a reliable indicator of kidney and muscle-related disorders. Herein, we reported a highly sensitive and selective non-enzymatic electrochemical creatinine sensor via modifying poly(3,4 ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) coated indium tin oxide (ITO) substrate by zeolitic imidazolate framework-8 nanoparticles (ZIF-8 NPs). The topography, crystallinity, and composition of the sensing electrode were characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The peroxidase-like activity of ZIF-8 nanoparticles enabled it to detect creatinine forming a zinc-creatinine composite. The electrochemical behavior and sensing performance were evaluated by amperometric and impedimetric analysis. The sensor obtained a sufficiently low limit of detection (LOD) of 30 µM in a clinically acceptable linear range (0.05 mM–2.5 mM). The interference study demonstrated high selectivity of the sensor for creatinine concerning other similar biomolecules. The sensing performance of the creatinine sensor was verified in the actual human serum, which showed excellent recovery rates. Hence, the magnificent performance of ZIF-8 based non-enzymatic creatinine sensor validated it as a responsible entity for other complicated renal markers detection.
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45

Chung, Saeromi, Lars Bode y Drew A. Hall. "Point-of-care human milk testing for maternal secretor status". Analytical and Bioanalytical Chemistry 414, n.º 10 (5 de noviembre de 2021): 3187–96. http://dx.doi.org/10.1007/s00216-021-03697-7.

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AbstractWe present an electrochemical impedimetric-based biosensor for monitoring the variation in human milk oligosaccharide (HMO) composition. 2′-Fucosyllactose (2’FL) is an HMO associated with infant growth, cognitive development, and protection from infectious diarrhea, one of the major causes of infant death worldwide. Due to genetic variation, the milk of some women (non-secretors) contains no or very little 2′FL with potential implications for infant health and development. However, there is currently no technology to analyze the presence and concentration of HMOs in human milk at the point-of-care (POC). The lack of such technology represents a major impediment to advancing human milk research and improving maternal-infant health. Towards this unmet need, we report an impedimetric assay for HMOs with an α-1,2 linkage, the most abundant of which is 2′FL. The sensor uses a lectin for affinity, specifically Ulex europaeusagglutininI (UEA), with electrochemical readout. In spiked studies, the sensor exhibited a high degree of linearity (R2 = 0.991) over 0.5 to 3.0 μM with a 330-nM detection limit. The sensor performance was clinically validated using banked human milk samples and correctly identified all secretor vs. non-secretor samples. Furthermore, despite the short 35-min assay time and low sample volume (25 μL), the assay was highly correlated with HPLC measurements. This bedside human milk testing assay enables POC, “sample-to-answer” quantitative HMO measurement, and will be a valuable tool to assess milk composition. Graphical abstract
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46

Carotenuto, Gianfranco. "New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources". European Journal of Engineering and Technology Research 4, n.º 10 (28 de octubre de 2019): 152–54. http://dx.doi.org/10.24018/ejeng.2019.4.10.1594.

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Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.
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47

Carotenuto, Gianfranco. "A New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources". European Journal of Engineering Research and Science 4, n.º 10 (28 de octubre de 2019): 152–54. http://dx.doi.org/10.24018/ejers.2019.4.10.1594.

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Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.
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48

Wang, Wenyu, Karim Ouaras, Alexandra L. Rutz, Xia Li, Magda Gerigk, Tobias E. Naegele, George G. Malliaras y Yan Yan Shery Huang. "Inflight fiber printing toward array and 3D optoelectronic and sensing architectures". Science Advances 6, n.º 40 (septiembre de 2020): eaba0931. http://dx.doi.org/10.1126/sciadv.aba0931.

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Scalability and device integration have been prevailing issues limiting our ability in harnessing the potential of small-diameter conducting fibers. We report inflight fiber printing (iFP), a one-step process that integrates conducting fiber production and fiber-to-circuit connection. Inorganic (silver) or organic {PEDOT:PSS [poly(3,4-ethylenedioxythiophene) polystyrene sulfonate]} fibers with 1- to 3-μm diameters are fabricated, with the fiber arrays exhibiting more than 95% transmittance (350 to 750 nm). The high surface area–to–volume ratio, permissiveness, and transparency of the fiber arrays were exploited to construct sensing and optoelectronic architectures. We show the PEDOT:PSS fibers as a cell-interfaced impedimetric sensor, a three-dimensional (3D) moisture flow sensor, and noncontact, wearable/portable respiratory sensors. The capability to design suspended fibers, networks of homo cross-junctions and hetero cross-junctions, and coupling iFP fibers with 3D-printed parts paves the way to additive manufacturing of fiber-based 3D devices with multilatitude functions and superior spatiotemporal resolution, beyond conventional film-based device architectures.
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49

Mandayo, Gemma García, Jaime Herrán, Irene Castro-Hurtado y Enrique Castaño. "Performance of a CO2 Impedimetric Sensor Prototype for Air Quality Monitoring". Sensors 11, n.º 5 (5 de mayo de 2011): 5047–57. http://dx.doi.org/10.3390/s110505047.

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50

Kang, Su Jin, Suseong Kim, Kyuhong Lee, Ik-Soo Shin y Yang-Rae Kim. "Tunable Electrochemical Grafting of Diazonium for Highly Sensitive Impedimetric DNA Sensor". Journal of The Electrochemical Society 167, n.º 8 (1 de mayo de 2020): 087504. http://dx.doi.org/10.1149/1945-7111/ab8ce8.

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