Miniaturized chemical sensor with bio-inspired micropillar working electrode array for lead detection

Wang, Nan; Kanhere, Elgar; Miao, Jianmin; Triantafyllou, Michael S.

doi:10.1016/j.snb.2016.04.048

Cited by 26 publications

(9 citation statements)

References 43 publications

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“…The experimental data were recorded for six replicated experiments and it is interesting to note that a reasonably good reproducibility of the results was obtained since the relative standard deviations (RSD) were below 4%. It was reported previously that using a miniaturized and compact microelectromechanical systems (MEMS) chemical sensor incorporated with a three-dimensional, free-standing micropillar working electrode showed a sensitivity of 32 nA/(µg/L) as well as a favorable detection limit of 0.2 µg/L for lead(II) detection [1]. A CeO 2 nanoparticle-decorated graphene hybrid modified glassy carbon electrode had a LOD of 0.1057 nM for lead(II) using the differential pulse anodic stripping voltammetric (DPASV) method [20].…”

Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

“…nA/(μg/L) as well as a favorable detection limit of 0.2 μg/L for lead(II) detection [1]. A CeO2 nanoparticle-decorated graphene hybrid modified glassy carbon electrode had a LOD of 0.1057 nM for lead(II) using the differential pulse anodic stripping voltammetric (DPASV) method [20].…”

Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

“…Enhanced industrial activities pose further environmental threats to our water bodies [1]. Industrial effluents that are incompletely treated or untreated are often discharged to the aquatic environment causing detrimental water quality.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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Due to health and pollution concerns of aquatic environments related to the presence of heavy metal toxic ions, the necessity of developing devices able to detect and to monitor such kinds of species has recently gained importance. Carbon paste electrodes (CPEs) a starting approach to obtain new ion-selective devices by supporting materials like bentonite and/or clay; which become sensitive to lead(II) when they are suitably modified by chemical treatments to obtain different hybrid materials. In this work, two natural clays and three different hybrid materials were produced and then were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy to assess their physico-chemical properties. After this stage, the electrochemical characterization of the modified CPEs using hybrid materials was performed by cyclic voltammetry, using the standard Fe(CN) 6 4− /Fe(CN) 6 3− redox couple. Subsequently, this study performed electrochemical experiments on lead(II) containing solutions, to test the ability of the examined CPEs to detect this toxic ion present in very low amounts. Lead(II) exhibited a reversible two electron oxidation/reduction behaviour in the cyclic voltammetry analyses and a reasonably good linear behaviour of the current associated with the oxidation peak as a function of its concentration (5.0-40.0 µg/L). The detection limit was found to vary in the range of 3-5 µg/L for the different modified CPEs. The presence of several co-existing ions showed that an interference variation had occurred. These results, therefore, show a restriction of the selectivity of the electrode up to a certain extent in the lead(II) detection. Finally, tap water with spiked lead(II) was analyzed to verify the suitability of the electrodes in the low level detection of lead(II) from real matrix samples.

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Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

See 1 more Smart Citation

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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“…BFEs can be prepared by simultaneously accumulating Bi ions together with target heavy metal ions onto the surface of supporting electrodes, e.g. glassy carbon electrode [10][11][12], pencil-lead [13], iridium microwire [14], gold micropillar electrode array [15], etc. In addition, BFEs can be modified with different materials, such as graphene oxide [16], chitosan [17], and carbon nano-fragments [18].…”

Section: Introductionmentioning

confidence: 99%

Flexible liquid crystal polymer-based electrochemical sensor for in-situ detection of zinc(II) in seawater

et al. 2017

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The authors describe a liquid crystal polymer (LCP) based bismuth (Bi) film electrode that can be directly deployed for in-situ determination of zinc(II) ions. The use of an LCP warrants improved operational reliability, high durability and flexibility of the sensor, allowing it to be mounted on any flat or shaped surface. Square wave anodic stripping voltammetry shows the sensor to be able to detect Zn(II) (-1.64 V vs. thin-film Ag/AgCl reference electrode) in concentrations as low as 1.22 nM at a deposition time of 180 s. Other figures of merit include (a) an analytical sensitivity of 1.55 nA•nM-1 •mm-2 , (b) a linear detection range extending from 4.59 to 1071 nM, (c) a repeatability with a relative standard deviation of 3.35% (for n = 10), (d) a reproducibility with a relative standard deviation of 1.64% (for n = 6). Real-time applicability of the sensor for in-situ detection was demonstrated by determination of Zn(II) in seawater. In an extension of the method, a flexible sensor array consisting of four LCP-based sensors was attached to the hull of an autonomous kayak, which was remotely operated. The response of the sensor array indicated a clear trace of Zn(II) concentrations in seawater. This was confirmed by ICP-MS analysis. The results suggest the potential usage of the flexible LCP electrochemical sensor for in-situ monitoring.

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“…Demands for robust analysis at the clinical point-of-care 1 , 2 as well as for monitoring pollutants in the environment 3 , 4 have led to diverse research directions toward the development and further size reduction of miniaturized analytical chemical sensors. Electrochemical detectors combine the advantages of being sensitive tools with a low cost, small sample volume, and fast response time.…”

mentioning

confidence: 99%

Electrochemical Amplification in Side-by-Side Attoliter Nanogap Transducers

et al. 2017

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We report a strategy for the fabrication of a new type of electrochemical nanogap transducer. These nanogap devices are based on signal amplification by redox cycling. Using two steps of electron-beam lithography, vertical gold electrodes are fabricated side by side at a 70 nm distance encompassing a 20 attoliter open nanogap volume. We demonstrate a current amplification factor of 2.5 as well as the possibility to detect the signal of only 60 analyte molecules occupying the detection volume. Experimental voltammetry results are compared to calculations from finite element analysis.

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Miniaturized chemical sensor with bio-inspired micropillar working electrode array for lead detection

Abstract: A disposable, miniaturized and compact microelectromechanical systems (MEMS) chemical sensor incorporated with three-dimensional, free-standing micropillar working electrode array was proposed, fabricated and tested for electrochemical detection of lead ions.

Cited by 26 publications

References 43 publications

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Flexible liquid crystal polymer-based electrochemical sensor for in-situ detection of zinc(II) in seawater

Electrochemical Amplification in Side-by-Side Attoliter Nanogap Transducers

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