Gold nanoparticles solid contact for ion-selective electrodes of highly stable potential readings

Jaworska, Ewa; Wójcik, Michał; Kisiel, Anna; Mieczkowski, Józef; Michalska, Agata

doi:10.1016/j.talanta.2011.07.049

Cited by 86 publications

(61 citation statements)

References 31 publications

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“…4 Additionally, an undesired water layer with about 100 Å thickness under the ion-selective membrane is another resource of potential drift, 5 which unintentionally acts as an inner filling solution with extremely small volume that reequilibrates on each and every change in sample composition and subsequently influences the boundary potential. 6 Both sources of potential instability can be eliminated by applying a variety of materials as solid contacts, such as lipophilic redox-active self-assembled monolayers, 7 conducting polymers, 8 fullerene, 9 three-dimensionally ordered macroporous (3DOM) carbon, 10 carbon nanotubes, 11 graphene, 12,13 gold nanoparticles, 14 and nanoclusters. 15 However, some of those materials may be not suitable for developing robust miniaturized ISEs.…”

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confidence: 99%

All-Solid-State Polymeric Membrane Ion-Selective Miniaturized Electrodes Based on a Nanoporous Gold Film as Solid Contact

2014

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ABSTRACT:A new type of all-solid-state polymeric membrane ion-selective electrodes (ISEs) is developed by using a nanoporous gold (NPG) film as solid contact. The NPG film is in situ formed on the surface of a gold wire electrode by the multicyclic electrochemical alloying/dealloying method. The characteristics of the NPG film, such as the large surface area, high double layer capacitance, and good conductivity, have been demonstrated by cyclic voltammetry and electrochemical impedance spectroscopy. The NPG film offers a well-defined interface between the electronic conductor and the ion-selective membrane. The NPG filmbased all-solid-state K + ISE shows a stable Nernstian response within the concentration range from 10 −6 to 10 −2 M, and the detection limit is 4.0 × 10 −7 M. The proposed electrode exhibits an improved potential stability with a reduced water layer in comparison with the coated-wire K + -ISE, which is due to the bicontinuous electron-and ion-conducting properties of the ionophore-doped polymeric membrane/NPG film interlayer. Unlike the additionally coated intermediate layers as single-use solid contacts, the in situ formed NPG film as solid contact is reusable. This work provides a versatile method for fabricating the robust, reliable, and low-maintenance miniaturized ISEs.

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confidence: 99%

All-Solid-State Polymeric Membrane Ion-Selective Miniaturized Electrodes Based on a Nanoporous Gold Film as Solid Contact

2014

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“…Michalska et al introduced AuNPs to act as a solid contact for the solid-state K + -ISE [38]. To increase the lipophilicity, AuNPs were modified with aliphatic thiols using the Brust-Schiffrin method in a two-phase liquid-liquid system [39,40].…”

Section: Nanoparticles and Nanoclustersmentioning

confidence: 99%

Applications of nanomaterials in potentiometric sensors

Yin

Qin

2013

TrAC Trends in Analytical Chemistry

181

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Keywords:Aptasensor Biosensor Carbon-based nanomaterial Chemosensor Ionophore Ion-selective electrode Ion-selective microelectrode Nanomaterial Neutral species Potentiometric sensor a b s t r a c t Nanomaterials play an important role in the fabrication of chemosensors and biosensors, due to their unique physical and chemical properties, such as large surface area/volume ratio, good conductivity, excellent electrocatalytic activity and high mechanical strength. We review recent advances in the applications of these nanomaterials in potentiometric sensors. We highlight the development of stable solidstate polymeric membrane ion-selective electrodes (ISEs). We describe ISEs based on ionophore-modified nanomaterials. Also, we present highly-sensitive potentiometric biosensors based on nanomaterials.

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“…For instance, the problem of the electrochemical stability of the solid contact material in SC-ISEs is well documented, and CPs have been employed to tackle it, as discussed in the previous section (211). Nanoparticles may also have a role to play in solving this issue, thanks to their chemical stability and tunable properties, for example, through control of the ligands and the core materials used in their fabrication (211).…”

Section: 1 Introduction To Metal Nanoparticlesmentioning

confidence: 99%