Mixed Gold and Platinum Nanostructured Layers for All-Solid-State Ion Sensors

Criscuolo, Francesca; Lobello, Lucia; Taurino, Irene; Demarchi, Danilo; Carrara, Sandro; Micheli, Giovanni De

doi:10.1109/icsens.2018.8630299

Cited by 6 publications

(8 citation statements)

References 28 publications

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“…Nanostructured-based SCs show some important advantages over CPs, including their hydrophobicity, large surface area, light insensitivity and high contact capacitance and the absence of side-reactions [4,24,25]. Both carbon and noble metals nanostructures have been used in SC-ISEs: they include carbon nanotubes [26,27,28,29], fullerene [30,31], graphene [29,32,33,34,35], polymer/carbon composites [36,37], porous carbon [38,39,40], gold nanoclusters [41], gold nanodendrites [24], nanoporous gold films [42], gold [43,44] and platinum [45] nanoparticles, platinum nanoflowers [46], combined platinum and gold nanostructures [47].…”

Section: Introductionmentioning

confidence: 99%

“…The use of noble metal nanostructures offers several advantages with respect to carbon-based materials, like their high stability, the non-toxicity and the possibility to use fast and conformal electrodeposition techniques for their fabrication [46,47,48]. In particular, we have recently proved that platinum nanoflowers deposited by a fast constant potential electrodeposition procedure on macro-electrodes allow the achievement of ISEs with high detection capabilities and exceptional stability.…”

Section: Introductionmentioning

confidence: 99%

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Fast Procedures for the Electrodeposition of Platinum Nanostructures on Miniaturized Electrodes for Improved Ion Sensing

Criscuolo

Taurino

Dam

et al. 2019

Sensors

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Nanostructured materials have attracted considerable interest over the last few decades to enhance sensing capabilities thanks to their unique properties and large surface area. In particular, noble metal nanostructures offer several advantages including high stability, non-toxicity and excellent electrochemical behaviour. However, in recent years the great expansion of point-of-care (POC) and wearable systems and the attempt to perform measurements in tiny spaces have also risen the need of increasing sensors miniaturization. Fast constant potential electrodeposition techniques have been proven to be an efficient way to obtain conformal platinum and gold nanostructured layers on macro-electrodes. However, this technique is not effective on micro-electrodes. In this paper, we investigate an alternative one-step deposition technique of platinum nanoflowers on micro-electrodes by linear sweep voltammetry (LSV). The effective deposition of platinum nanoflowers with similar properties to the ones deposited on macro-electrodes is confirmed by morphological analysis and by the similar roughness factor (~200) and capacitance (~18 μ F/mm 2 ). The electrochemical behaviour of the nanostructured layer is then tested in an solid-contact (SC) L i + -selective micro-electrode and compared to the case of macro-electrodes. The sensor offers Nernstian calibration with same response time (~15 s) and a one-order of magnitude smaller limit of detection (LOD) ( 2.6 × 10 − 6 ) with respect to the macro-ion-selective sensors (ISE). Finally, sensor reversibility and stability in both wet and dry conditions is proven.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast Procedures for the Electrodeposition of Platinum Nanostructures on Miniaturized Electrodes for Improved Ion Sensing

Criscuolo

Taurino

Dam

et al. 2019

Sensors

Self Cite

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“…The mixed gold (Au)–platinum ion‐selective electrodes (ISEs) fabricated by Criscuolo et al [2] is mostly stable and precise in ion sensors, but it requires laboratory‐based equipment for measurement. A hydrogel‐based piezoresistive microsensor can be used to measure chemical quantities, but the massive difference in response times makes them more suitable as actuators rather than sensors [3].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, calibration, and preliminary testing of microcantilever‐based piezoresistive sensor for BioMEMS applications

Rotake

Darji

Kale

2020

IET nanobiotechnol.

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In this study, the authors demonstrate the fabrication, calibration, and testing of a piezoresistive microcantileverbased sensor for biomedical microelectromechanical system (BioMEMS) application. To use any sensor in BioMEMS application requires surface modification to capture the targeted biomolecules. The surface alteration comprises self-assembled monolayer (SAM) formation on gold (Au)/chromium (Cr) thin films. So, the Au/Cr coating is essential for most of the BioMEMS applications. The fabricated sensor uses the piezoresistive technique to capture the targeted biomolecules with the SAM/Au/Cr layer on top of the silicon dioxide layer. The stiffness (k) of the cantilever-based biosensor is a crucial design parameter for the low-pressure range and also influence the sensitivity of the microelectromechanical system-based sensor. Based on the calibration data, the average stiffness of the fabricated microcantilever with and without Au/Cr thin film is 141.39 and 70.53 mN/m, respectively, which is well below the maximum preferred range of stiffness for BioMEMS applications. The fabricated sensor is ultra-sensitive and selective towards Hg 2+ ions in the presence of other heavy metal ions (HMIs) and good enough to achieve a lower limit of detection 0.75 ng/ml (3.73 pM/ml).

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“…The ion-selective electrodes (ISEs) fabricated by [7] are stable and precise for HMI detection, but the measurement requires by laboratory equipment. Sensors based on nanotubes, nanorods, nanoneedles, or nanoplates are also used to detect HMIs selectively down to the nanomolar range [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive detection of cadmium ions using a microcantilever-based piezoresistive sensor for groundwater

Rotake

Darji

Kale

2020

Beilstein J. Nanotechnol.

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This paper proposes the selective and ultrasensitive detection of Cd(II) ions using a cysteamine-functionalized microcantilever-based sensor with cross-linked ᴅʟ-glyceraldehyde (DL-GC). The detection time for various laboratory-based techniques is generally 12–24 hours. The experiments were performed to create self-assembled monolayers (SAMs) of cysteamine cross-linked with ᴅʟ-glyceraldehyde on the microcantilever surface to selectively capture the targeted Cd(II). The proposed portable microfluidic platform is able to achieve the detection in 20–23 min with a limit of detection (LOD) of 0.56 ng (2.78 pM), which perfectly describes its excellent performance over other reported techniques. Many researchers used nanoparticle-based sensors for the detection of heavy metal ions, but daily increasing usage and commercialization of nanoparticles are rapidly expanding their deleterious effect on human health and the environment. The proposed technique uses a blend of thin-film and microcantilever (micro-electromechanical systems) technology, which mitigate the disadvantages of the nanoparticle approaches, for the selective detection of Cd(II) with a LOD below the WHO limit of 3 μg/L.

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Mixed Gold and Platinum Nanostructured Layers for All-Solid-State Ion Sensors

Cited by 6 publications

References 28 publications

Fast Procedures for the Electrodeposition of Platinum Nanostructures on Miniaturized Electrodes for Improved Ion Sensing

Fast Procedures for the Electrodeposition of Platinum Nanostructures on Miniaturized Electrodes for Improved Ion Sensing

Fabrication, calibration, and preliminary testing of microcantilever‐based piezoresistive sensor for BioMEMS applications

Ultrasensitive detection of cadmium ions using a microcantilever-based piezoresistive sensor for groundwater

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