Microfabrication and characterization of cylinder micropillar array electrodes

Prehn, Ricard; Abad, Llibertat; Sánchez-Molas, David; Duch, Marta; Sabaté, N.; Campo, F. Javier del; Muñoz, Francesc Xavier; Compton, Richard G.

doi:10.1016/j.jelechem.2011.09.002

Cited by 38 publications

(50 citation statements)

References 42 publications

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“…Cu and Ag) have been produced by electrodeposition on non-metallic substrates as boron-doped diamond [8]. Furthermore, arrays made of non-metallic microelectrode as diamond based material [8,[49][50][51], carbon based materials [52][53][54][55] Several thin metal or multiple metals layers (few tens of nm), deposited between the supporting substrate and the electrode material, have been explored to promote adhesion; Ta [58], Ti [24], Al [28,[59][60][61], Cr [60,62] or composite layer as Ti/Pt sandwich (30:50 nm) [45] and Ti/Ni (50:50 nm) [46,63] have been used as adhesive layer for Ir [24,25,58], Au [44][45][46]60,62] and Pt [59][60][61].…”

Section: Ii1a Micro-electrode Array Fabricationmentioning

confidence: 99%

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Stripping voltammetry at micro-interface arrays: A review

Herzog

Beni

2013

Analytica Chimica Acta

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In this article, a comprehensive overview of the most recent developments in the field of stripping voltammetry at regular micro-interfaces (both solid-liquid and liquid-liquid interfaces) is presented. This review will report on the most conventional arrays of metallic micro-electrodes but also on the rapidly growing field of electrochemistry at arrays of micro-interfaces between two immiscible electrolyte solutions (μITIES). The main fabrication methods, together with some design considerations and diffusion phenomena at such interfaces are discussed. Main applications of micro-interface arrays are presented including heavy metals detection at micro-electrode arrays and detection of organic molecules (amino acids, vitamins, peptides and drugs) at the μITIES. Stripping analysis at micro-interface arrays is suitable for the detection of analytes in several real media including water, soil extracts and biological fluids (blood and saliva) with high specificity, sensitivity (detection limits of nM, ppb level) and reliability. Stripping analysis at μITIES and micro-electrode arrays are two complementary approaches that have the advantages of being cost effective, simple to use and easily adaptable to field measurement.

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Section: Ii1a Micro-electrode Array Fabricationmentioning

confidence: 99%

“…The adhesion layer needs to be selected carefully as it may also be the source of interference [63].…”

Section: Ii1a Micro-electrode Array Fabricationmentioning

confidence: 99%

Stripping voltammetry at micro-interface arrays: A review

Herzog

Beni

2013

Analytica Chimica Acta

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“…Thus, it is possible to create nano-and microelectrodes and their arrays [18][19][20][21], including disks [20,22], bands [23,24] and 3D structures [25][26][27], and wire them either in parallel or individually [18,20]. On top of that, microfabrication techniques allow the cost-effective mass-production of microsensors that can be deployed in a vast number of applications.…”

Section: Introductionmentioning

confidence: 99%

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

et al. 2014

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A novel microelectrode array sensor was fabricated using MEMS technology on a needle, and then applied to real-time measurement of dissolved oxygen (DO) inside biofilms. The sensor consists of eleven gold disk microelectrodes and a rectangular auxiliary electrode along them and an external & internal reference electrode. Three kinds of sensors were designed and their responses were characterized and evaluated under various environmental conditions. The arrays exhibit a linear response to DO in the 0 -8 mg L -1 concentration range in water, high sensitivity, repeatability, and low limits of detection (< 0.11 mg L -1 ) and quantification (0.38 mg L -1 ). The sensors were then validated against a commercial Clark-type microelectrode and applied to profiling of DO in a heterotrophic biofilm cultivated in a flat-plate bioreactor. It is shown that the sensor array can provide a multipoint, simultaneous snapshot profile of DO inside a biofilm with high spatial resolution due to its micrometric dimensions. We conclude that this new sensor array represents a powerful tool for sensing of DO biofilms and in numerous bioprocesses.

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“…MEMS technology allows for a more versatile design, enabling the fabrication of microelectrodes of different sizes, geometries and arrangements (del Campo et al 2014;Prehn et al 2011). In addition, microfabrication techniques allow for cost-effective massproduction of microsensors that may be used for a variety of applications.…”

Section: Introductionmentioning

confidence: 99%

Biofilm dynamics characterization using a novel DO-MEA sensor: mass transport and biokinetics

Guimerà

Moya

Dorado

et al. 2014

Appl Microbiol Biotechnol

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Biodegradation process modeling is an essential tool for the optimization of biotechnologies related to gaseous pollutants treatment. In these technologies, the predominant role of biofilm, particularly under conditions of no mass transfer limitations, results in a need to determine what processes are occurring within the same. By measuring the interior of the biofilms, an increased knowledge of mass transport and biodegradation processes may be attained. This information is useful in order to develop more reliable models that take biofilm heterogeneity into account. In this study, a new methodology, based on a novel dissolved oxygen (DO) and mass transport microelectronic array (MEA) sensor, is presented in order to characterize a biofilm. Utilizing the MEA sensor, designed to obtain DO and diffusivity profiles with a single measurement, it was possible to obtain distributions of oxygen diffusivity and biokinetic parameters along a biofilm grown in a flat plate bioreactor (FPB). The results obtained for oxygen diffusivity, estimated from oxygenation profiles and direct measurements, revealed that changes in its distribution were reduced when increasing the liquid flow rate. It was also possible to observe the effect of biofilm heterogeneity through biokinetic parameters, estimated using the DO profiles. Biokinetic parameters, including maximum specific growth rate, the Monod half-saturation coefficient of oxygen and the maintenance coefficient for oxygen which showed a marked variation across the biofilm, suggest that a tool that considers the heterogeneity of biofilms is essential for the optimization of biotechnologies.2

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Microfabrication and characterization of cylinder micropillar array electrodes

Cited by 38 publications

References 42 publications

Stripping voltammetry at micro-interface arrays: A review

Stripping voltammetry at micro-interface arrays: A review

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

Biofilm dynamics characterization using a novel DO-MEA sensor: mass transport and biokinetics

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