Microelectrode Arrays with Overlapped Diffusion Layers as Electroanalytical Detectors: Theory and Basic Applications

Tomčı́k, Peter

doi:10.3390/s131013659

Cited by 35 publications

(9 citation statements)

References 135 publications

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“…The use of microdisk electrodes for electroanalytical chemistry is particularly beneficial due to the higher current density, lower Ohmic drop contributions, and a smaller amount of electrode material required (especially important where expensive nobel metals are used), compared to conventional mm-sized surfaces. The overall current can be enhanced by employing arrays of microdisk electrodes [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], ideally sufficiently separated so that their diffusion fields do not overlap and each individual electrode can be addressed independently [ 11 , 12 ]. Room temperature ionic liquids (RTILs) are seen as favorable solvents for use with such miniaturized devices [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids

2018

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Electrochemical gas sensors are often used for identifying and quantifying redox-active analyte gases in the atmosphere. However, for amperometric sensors, the current signal is usually dependent on the electroactive surface area, which can become small when using microelectrodes and miniaturized devices. Microarray thin-film electrodes (MATFEs) are commercially available, low-cost devices that give enhanced current densities compared to mm-sized electrodes, but still give low current responses (e.g., less than one nanoamp), when detecting low concentrations of gases. To overcome this, we have modified the surface of the MATFEs by depositing platinum into the recessed holes to create arrays of 3D structures with high surface areas. Dendritic structures have been formed using an additive, lead acetate (Pb(OAc)2) into the plating solution. One-step and two-step depositions were explored, with a total deposition time of 300 s or 420 s. The modified MATFEs were then studied for their behavior towards oxygen reduction in the room temperature ionic liquid (RTIL) [N8,2,2,2][NTf2]. Significantly enhanced currents for oxygen were observed, ranging from 9 to 16 times the current of the unmodified MATFE. The highest sensitivity was obtained using a two-step deposition with a total time of 420 s, and both steps containing Pb(OAc)2. This work shows that commercially-available microelectrodes can be favorably modified to give significantly enhanced analytical performances.

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Section: Introductionmentioning

confidence: 99%

Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids

2018

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“…Without adsorption, the current follows a step function, due to full redox cycling starting within the order of the diffusion time in between the electrodes . For the device used here, a response time of approximately 10 µs is predicted .…”

Section: Resultsmentioning

confidence: 97%

Simulation of the impact of reversible adsorption on the response time of interdigitated electrode arrays

Krause

Kätelhön

Offenhäusser

et al. 2014

Physica Status Solidi (a)

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We simulate the amperometric response time of an interdigitated electrode array with respect to reversible adsorption of redox active molecules at the electrode surface. When neighboring electrodes are biased to potentials below and above the redox potential of the species under investigation, molecules can participate in repetitive reactions leading to an amplification of the Faradaic current. During collisions between molecules and electrodes, the molecules may undergo reversible adsorption. We simulate the behavior of this redox cycling process by using a discrete random walk model, which mimics the diffusive pathway of the molecules. Adsorption probabilities are implemented via the boundary conditions at the electrodes. Using this simulation, we investigate the effect of reversible adsorption on the response time of the interdigitated electrode array.

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“…Several reviews have summarized the progresses on micro-or nano-electrode array sensors with concerns for relevant theory, fabrication or application (Arrigan, 2004;Huang et al, 2009;Orozco et al, 2010;Yeh and Shi, 2010;Zoski and Wijesinghe, 2010;Henstridge and Compton, 2012;Chen et al, 2013;Ongaro and Ugo, 2013;Tomčík, 2013;Karimian et al, 2016;Karimian and Ugo, 2019). In this minireview ( Figure 1A), we have mainly focused on the recent accomplishments in materials and innovative techniques for the construction of various micro/nano electrode array sensors and their unique applications in bioanalysis.…”

Section: Introductionmentioning

confidence: 99%

Micro/Nano Electrode Array Sensors: Advances in Fabrication and Emerging Applications in Bioanalysis

Liu

Chen

et al. 2020

Front. Chem.

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Due to the rapid development of micro/nano manufacturing techniques and the greater understanding in electrochemical principles and methods, micro/nano electrode array sensing has received much attention in recent years, especially in bioanalysis. This review aims to explore recent progress in innovative techniques for the construction of micro/nano electrode array sensor and the unique applications of various types of micro/nano electrode array sensors in biochemical analysis. Moreover, the new area of smart sensing benefited from miniaturization of portable micro/nano electrode array sensors as well as wearable intelligent devices are further discussed.

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Microelectrode Arrays with Overlapped Diffusion Layers as Electroanalytical Detectors: Theory and Basic Applications

Cited by 35 publications

References 135 publications

Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids

Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids

Simulation of the impact of reversible adsorption on the response time of interdigitated electrode arrays

Micro/Nano Electrode Array Sensors: Advances in Fabrication and Emerging Applications in Bioanalysis

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