Effect of surface conductivity on the sensitivity of interdigitated impedimetric sensors and their design considerations

Guimerà‐Brunet, Anton; Gabriel, Gemma; Prats‐Alfonso, Elisabet; Abramova, Natalia; Bratov, Andrey; Villa, Rosa

doi:10.1016/j.snb.2014.10.134

Cited by 25 publications

(26 citation statements)

References 23 publications

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“…Planar IDEA devices are formed by a pair of comb-like metal electrodes on a planar insulating substrate by conventional micro-fabrication techniques. In this case, impedance is measured between the two electrodes and depends on the solution conductivity and the interfacial properties of the electrodes: interfacial capacitance (Berggren et al 2001) and surface conductivity (Guimerà et al 2015). While traditional macro-electrodes with large surface area can be used to carry out measurements of interfacial capacitance, in micro-scale transducers the surface charge also plays an important role (Guimerà et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…In this case, impedance is measured between the two electrodes and depends on the solution conductivity and the interfacial properties of the electrodes: interfacial capacitance (Berggren et al 2001) and surface conductivity (Guimerà et al 2015). While traditional macro-electrodes with large surface area can be used to carry out measurements of interfacial capacitance, in micro-scale transducers the surface charge also plays an important role (Guimerà et al 2015). In this sense, to improve the sensitivity of standard IDEA sensors a three-dimensional interdigitated electrode arrays (3D-IDEA) impedance transducer, in which the electrodes are separated by insulating barriers, was proposed (Bratov and Abramova 2013b;Bratov et al 2008b).…”

Section: Introductionmentioning

confidence: 99%

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Novel impedimetric aptasensor for label-free detection of Escherichia coli O157:H7

Brosel-Oliu

Ferreira

Uría

et al. 2018

Sensors and Actuators B: Chemical

100

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Microbial safety of drinking water constitutes a major concern in countries at all levels of economic development. Thus, rapid, sensitive and cost effective methods of pathogenic bacteria detection, like common like Escherichia coli O157:H7, which can cause important diseases, is highly required. In this work an impedimetric transducer modified with E. coli specific aptamer is studied. To enhance the sensitivity a three-dimensional interdigitated electrode array (3D-IDEA) impedimetric transducer in which the electrodes separated by insulating barriers was used. In this sensor, chemical reactions at the surface of the barrier provoke electrical charge redistribution which causes changes in surface conductivity. A DNA aptamer that recognizes specifically the outer membrane proteins of the E. coli O157:H7 was selected as the biorecognition moiety. Here we report a novel label-free impedance aptasensor for detection and quantification of pathogenic E. coli O157:H7 with a low detection limit, good selectivity and short detection times. The developed sensor shows a linear response (R 2 =0.977), proportional to the logarithm of bacterial concentration present in the sample, with a limit of detection (LOD) of about 10 2 cfu•mL-1. No response was registered when the aptasensor was incubated with other bacterial strains, confirming the selectivity of suggested method. Additionally, the possibility of the sensor regeneration is shown, so that the detection may be performed several times with the same sensor. Moreover, suitability of the aptasensor for bacteria detection in real samples was demonstrated with a new approach involving bacteria pre-concentration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel impedimetric aptasensor for label-free detection of Escherichia coli O157:H7

Brosel-Oliu

Ferreira

Uría

et al. 2018

Sensors and Actuators B: Chemical

100

View full text Add to dashboard Cite

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“…In this case Faradaic charge transfer resistance is measured, which may be affected by interactions of a target biomolecule with a probefunctionalized sensor surface [15]. To avoid addition of redox-agents and to be able to perform the measurements immediately on the area close to the electrode surface the capacitive biosensors based on interdigitated electrode arrays (IDEA) were introduced [16].…”

Section: Introductionmentioning

confidence: 99%

“…In this case biochemical reactions at the sensor surface are registered as capacitance changes in non-Faradaic measurements. Planar microband electrodes of IDEA, between which the impedance is measured, are very closely situated, so that in this case changes in electrical properties of the interdigital space may affect the sensor impedance [15]. Several years ago the concept of a threedimensional interdigitated electrode arrays (3D-IDEA) with electrode fingers separated by an insulating barrier was proposed [9,17].…”

Section: Introductionmentioning

confidence: 99%

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Development of label-free impedimetric platform based on new conductive polyaniline polymer and three-dimensional interdigitated electrode array for biosensor applications

Voitechovič

Bratov

Abramova

et al. 2015

Electrochimica Acta

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Artifact‐Free 2D Mapping of Neural Activity In Vivo through Transparent Gold Nanonetwork Array

Seo

Kim

Seo

et al. 2020

Adv Funct Materials

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With the rapid increase in the use of optogenetics to investigate the nervous system, there is a high demand for a neural interface that enables 2D mapping of electrophysiological neural signals with high precision during simultaneous light stimulation. Here, a gold nanonetwork (Au NN)-based transparent neural electrocorticogram (ECoG) monitoring system is proposed as implantable neural electronics. The neural interface enables accurate 2D mapping of ECoG neural signals without any photoelectric artifact during light stimulation. By using the Au NN, not only the transmittance of the microelectrodes is increased by 81% but also a low electrochemical impedance of 33.9 kΩ at 1 kHz with improved mechanical stability is achieved. It is demonstrated that the transparent microelectrode array records multichannel in vivo neural activities with no photoelectric artifact and a high signal-tonoise ratio. Propagation of neural dynamics of optically driven neural activities is also clearly visualized using the 2D Au NN microelectrode array. This transparent, flexible ECoG microelectrode array is a promising candidate for next-generation in vitro and in vivo neural interface for 2D mapping of neural dynamics.

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Effect of surface conductivity on the sensitivity of interdigitated impedimetric sensors and their design considerations

Cited by 25 publications

References 23 publications

Novel impedimetric aptasensor for label-free detection of Escherichia coli O157:H7

Novel impedimetric aptasensor for label-free detection of Escherichia coli O157:H7

Development of label-free impedimetric platform based on new conductive polyaniline polymer and three-dimensional interdigitated electrode array for biosensor applications

Artifact‐Free 2D Mapping of Neural Activity In Vivo through Transparent Gold Nanonetwork Array

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