Needle-type dissolved oxygen microelectrode array sensors for in situ measurements

Lee, Jin-Hwan; Lim, Tae-Sun; Seo, Young-Woo; Bishop, Paul L.; Papautsky, Ian

doi:10.1016/j.snb.2007.06.008

Cited by 56 publications

(54 citation statements)

References 13 publications

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“…Since current application is necessary for electrodeposition, application of current to specific pads of a packaged sensor results in selective deposition of the IrOx film. Thus, this approach offers the ability to selectively deposit metallic films at the tips of specific needle sensors, paving the way to integration of the pH sensor with the previously described needle-type ORP 4,5 and DO 6,7 sensors. Taking this approach further, different metallic films may be deposited at the tips of different needle sensors, permitting future integration of the pH sensor with the recently described phosphate sensor based on the cobalt oxide sensing layer.…”

Section: Resultsmentioning

confidence: 99%

“…We recently applied MEMS technologies to the development of microelectrode arrays (MEAs) for measurement of the oxidation-reduction potential (ORP) 4,5 and dissolved oxygen (DO). 6,7 ORP is a measure of the solution potential and thus ORP MEA sensors are non-specific and measure the oxidized and reduced forms of all chemical species in the solution. DO MEA sensors are ion-selective and exhibit sensitivity to oxygen due to the recessed structure of the gold cathode.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a needle-type pH sensor by selective electrodeposition

Choi

2011

J. Micro/Nanolith. MEMS MOEMS

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Abstract. This manuscript reports on the development of a needle-type sensor for in situ on-site measurement of pH. Conventional pH microelectrode sensors are fabricated by pulling glass pipettes and applying ion-selective films at the tip. However, these sensors suffer from low fabrication yields and short sensor lifetime due to disruption or loss of the ion-selective membrane after repeated use. The developed needle-type sensor is fabricated by meniscus etching and takes advantage of the MEMS batch fabrication techniques. The sensor is based on the ion-selective properties of iridium oxide film, which was deposited at the sensor tip by electrodeposition. The sensor exhibited a Nernstian response with sensitivity of ∼62 mV/pH in the pH 2 to 12 range. The sensor also exhibited a fast 5 s response and a lifetime of ∼2 months when stored in a pH7 buffer solution, which is substantially longer than that of the conventional pulledpipette sensors. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of a needle-type pH sensor by selective electrodeposition

Choi

2011

J. Micro/Nanolith. MEMS MOEMS

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“…The DO-MEA sensor was tested in biofilms, presenting similar behavior to other DO microsensors based on MEMS technology (Lee et al 2007;Liu and Chen 2009). Furthermore, DO-MEA sensor operation was compared to that of commercial Clark-type microsensor for biofilm monitoring (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, different microsensors based on micro-electro mechanical system technology (MEMS) have been developed in order to improve microsensor performance in biofilm monitoring (Del Campo et al 2007; Lee et al 2007;Liu and Chen 2009). 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).…”

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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“…There are, however, other designs without membranes (Sosna et al, 2007), which serve as prototypes for laboratory use, but are not suitable for in situ measurements. A needle-type dissolved oxygen microelectrode array sensor (Lee et al, 2007) or a microelectrode sensor designed by Sosna et al (2008) are other examples. Nevertheless, those designs need continuous maintenance.…”

Section: Dissolved Oxygenmentioning

confidence: 99%

Study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments

Boronat¹

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There are many efforts done in the aquaculture to reach its sustainability, although in reality, it is far from being sustainable. Its negative impacts on the environment can be prevented and corrected by the use of sensors, developing precision aquaculture. The water quality affects to the fish performance. The temperature and salinity are some factors that affect to the fish growth. Nevertheless, other factors such as turbidity, photoperiod and dissolved oxygen among other can affect to the fish feeding needs. To adjust the amount of feed needed is crucial to ensure the sustainability of the aquaculture and to increase the economic profit of the facilities. Monitoring the water quality allows estimating the feed needs. However, it is not enough. To monitor the fish behavior, especially during the feeding period can help to adapt the provided feed. Then, if it is so clear that the monitoring can help to the aquaculture production, why we do not see this monitoring systems in the aquaculture facilities? Why in most of the facilities the feed is given manually without considering the fish feeding behavior?Nevertheless, the current price of the sensors for monitoring the fish farms is extremely high. The employed sensors are in most of the cases, the same that are used for oceanography. The proposed systems in the literature only cover some water quality parameters and usually do not consider fish feeding behavior. It is need low-cost sensors suitable for aquaculture monitoring. Those sensors must also be low-energy consumption, easy to use and with the option to include them in a network in order to send the data. Thus, we can use these sensors and sensors network to monitor the activity, to send alarms if it is necessary and to automatize processes. Moreover, including Internet, the data can be seen remotely. The use of those sensors can help to the aquaculture production.In this thesis, we show the study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments. First, we study in detail the requirements of sensors in aquaculture. Then, we show the state of the art of the current sensors for water quality monitoring and for aquaculture monitoring.Following, we present the design and development of some low-cost sensors and their applications in fish farm facilities with open system and recirculating system. Moreover we show a complete system which monitors up to 10 parameters including water quality (temperature, salinity, turbidity and presence of hydrocarbon/oil layer), tank environment (water level, illumination, presence of workers), and fish feeding behavior (shoal swimming depth, estimation of changes on shoal swimming velocity and feed falling). Moreover, it accomplishes the features of low-cost and low energy consumption. The estimated price for proposed system is less than 100€ per tank. In addition, we show the use of some of the aforementioned sensors for automatic adjustment of fish feeding process.Finally, some of the develop...

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Needle-type dissolved oxygen microelectrode array sensors for in situ measurements

Cited by 56 publications

References 13 publications

Fabrication of a needle-type pH sensor by selective electrodeposition

Fabrication of a needle-type pH sensor by selective electrodeposition

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

Study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments

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