Reagent free electrochemical-based detection of silver ions at interdigitated microelectrodes using in-situ pH control

Wasiewska, Luiza Adela; Seymour, Ian; Patella, Bernardo; Inguanta, Rosalinda; Burgess, Catherine M.; Duffy, Geraldine; O’Riordan, Alan

doi:10.1016/j.snb.2021.129531

Cited by 60 publications

(25 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The possibility of using non-invasive measurement systems is of extreme importance in extremely sensitive patients, such as those suffering from neurodegenerative diseases or in children [8,15]. In this perspective, electrochemical sensors appear to be very interesting because they allow carrying out Chemosensors 2021, 9, 169 2 of 14 analyses in situ, are fast, reliable and inexpensive and also do not require highly specialized personnel [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

et al. 2021

Self Cite

View full text Add to dashboard Cite

Nowadays, we are assisting in the exceptional growth in research relating to the development of wearable devices for sweat analysis. Sweat is a biofluid that contains useful health information and allows a non-invasive, continuous and comfortable collection. For this reason, it is an excellent biofluid for the detection of different analytes. In this work, electrochemical sensors based on polyaniline thin films deposited on the flexible substrate polyethylene terephthalate coated with indium tin oxide were studied. Polyaniline thin films were abstained by the potentiostatic deposition technique, applying a potential of +2 V vs. SCE for 90 s. To improve the sensor performance, the electronic substrate was modified with reduced graphene oxide, obtained at a constant potential of −0.8 V vs. SCE for 200 s, and then polyaniline thin films were electrodeposited on top of the as-deposited substrate. All samples were characterized by XRD, SEM, EDS, static contact angle and FT-IR/ATR analysis to correlate the physical-chemical features with the performance of the sensors. The obtained electrodes were tested as pH sensors in the range from 2 to 8, showing good behavior, with a sensitivity of 62.3 mV/pH, very close to a Nernstian response, and a reproducibility of 3.8%. Interference tests, in the presence of competing ions, aimed to verify the selectivity, were also performed. Finally, a real sweat sample was collected, and the sweat pH was quantified with both the proposed sensor and a commercial pH meter, showing an excellent concordance.

show abstract

Section: Introductionmentioning

confidence: 99%

PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The gold oxide reduction peak was used as a probe for the pH condition of the electrodes [ 50 , 51 ]. An oxide was formed on a gold electrode by scanning to a sufficiently positive potential, typically around 1.2 V. The electrode was then swept cathodically to the initial potential and the position of the oxide reduction peak was noted.…”

Section: Resultsmentioning

confidence: 99%

Advanced Solid State Nano-Electrochemical Sensors and System for Agri 4.0 Applications

Seymour¹,

Narayan²,

Creedon³

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

Global food production needs to increase in order to meet the demands of an ever growing global population. As resources are finite, the most feasible way to meet this demand is to minimize losses and improve efficiency. Regular monitoring of factors like animal health, soil and water quality for example, can ensure that the resources are being used to their maximum efficiency. Existing monitoring techniques however have limitations, such as portability, turnaround time and requirement for additional reagents. In this work, we explore the use of micro- and nano-scale electrode devices, for the development of an electrochemical sensing platform to digitalize a wide range of applications within the agri-food sector. With this platform, we demonstrate the direct electrochemical detection of pesticides, specifically clothianidin and imidacloprid, with detection limits of 0.22 ng/mL and 2.14 ng/mL respectively, and nitrates with a detection limit of 0.2 µM. In addition, interdigitated electrode structures also enable an in-situ pH control technique to mitigate pH as an interference and modify analyte response. This technique is applied to the analysis of monochloramine, a common water disinfectant. Concerning biosensing, the sensors are modified with bio-molecular probes for the detection of both bovine viral diarrhea virus species and antibodies, over a range of 1 ng/mL to 10 µg/mL. Finally, a portable analogue front end electronic reader is developed to allow portable sensing, with control and readout undertaken using a smart phone application. Finally, the sensor chip platform is integrated with these electronics to provide a fully functional end-to-end smart sensor system compatible with emerging Agri-Food digital decision support tools.

show abstract

“…The opposite side of the comb is held at a constant potential to adjust the pH close to the electrode to the required pH. This method has been shown to work for the detection of free chlorine [35], silver [36] and has also been used for the elimination of oxygen interference in the detection of monochloramine [37].…”

Section: Electrode Type Linear Range Lodmentioning

confidence: 99%

Platinum Interdigitated Electrode Arrays for Reagent-Free Detection of Copper

Daly¹,

Narayan²,

O’Riordan³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

<p>Water is a precious resource that is under threat from a number of pressures, including release of toxic compounds that can have damaging effect on ecology and human health. The current methods of water quality monitoring are based on sample collection and analysis at dedicated laboratories. This can provide an incomplete picture of the status of the water body as pollution events can be missed. Recently, electrochemical based methods have attracted a lot of attention for environmental sensing owing to their versatility, sensitivity and compatible integration with cost effective, smart and portable readout systems. In the present work, we report on the fabrication and characterization of platinum interdigitated microband electrodes arrays, and their application for trace detection of copper. Using square wave voltammetry after acidification with mineral acids, a limit of detection of 0.8 μg/L was achieved. Copper detection was also under taken on river water samples and compared with standard analytical techniques. The possibility of controlling the pH at the surface of the sensors – thereby avoiding the necessity to add mineral acids – was investigated. By applying potentials driving the water splitting reaction at one comb on the sensors electrode (the protonator), it was possible to lower the pH in the vicinity of the sensing electrode. Detection of standard copper solutions down to 5 μg/L using this technique is reported. This reagent free method of detection opens the way for autonomous, in situ monitoring of pollutants in water bodies.</p>

show abstract

Reagent free electrochemical-based detection of silver ions at interdigitated microelectrodes using in-situ pH control

Cited by 60 publications

References 43 publications

PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

Advanced Solid State Nano-Electrochemical Sensors and System for Agri 4.0 Applications

Platinum Interdigitated Electrode Arrays for Reagent-Free Detection of Copper

Contact Info

Product

Resources

About