Nanostructured materials in potentiometry

Düzgün, Ali; Zelada‐Guillén, Gustavo A.; Crespo, Gastón A.; Macho, Santiago; Riu, Jordi; Rius, F. Xavier

doi:10.1007/s00216-010-3974-3

Cited by 87 publications

(34 citation statements)

References 71 publications

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“…Conducting polymers perform as excellent redox transducers, but some of them display practical limitations, such as light sensitivity, the formation of a water layer at the interface between the transducer and the polymeric membrane and the formation of unwanted redox reactions [20]. Therefore, new solid-state transducing materials can be of great interest in order to develop novel SSREs with enhanced analytical and operational characteristics.…”

Section: Introductionmentioning

confidence: 99%

Solid-state reference electrodes based on carbon nanotubes and polyacrylate membranes

et al. 2011

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A novel potentiometric solid-state reference electrode containing single-walled carbon nanotubes as the transducer layer between a polyacrylate membrane and the conductor is reported here. Single-walled carbon nanotubes act as an efficient transducer of the constant potentiometric signal originating from the reference membrane containing the Ag/AgCl/Cl− ions system, and they are needed to obtain a stable reference potentiometric signal. Furthermore, we have taken advantage of the light insensitivity of single-walled carbon nanotubes to improve the analytical performance characteristics of previously reported solid-state reference electrodes. Four different polyacrylate polymers have been selected in order to identify the most efficient reservoir for the Ag/AgCl system. Finally, two different arrangements have been assessed: (1) a solid-state reference electrode using photo-polymerised n-butyl acrylate polymer and (2) a thermo-polymerised methyl methacrylate:n-butyl acrylate (1:10) polymer. The sensitivity to various salts, pH and light, as well as time of response and stability, has been tested: the best results were obtained using single-walled carbon nanotubes and photo-polymerised n-butyl acrylate polymer. Water transport plays an important role in the potentiometric performance of acrylate membranes, so a new screening test method has been developed to qualitatively assess the difference in water percolation between the polyacrylic membranes studied. The results presented here open the way for the true miniaturisation of potentiometric systems using the excellent properties of single-walled carbon nanotubes.

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Section: Introductionmentioning

confidence: 99%

Solid-state reference electrodes based on carbon nanotubes and polyacrylate membranes

et al. 2011

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“…Especially, the exceptional electrical properties such as the high charge transfer, the extraordinary electrical capacities and good hydrophobicity make them suitable as transducing components in potentiometric sensors [16,17]. Recently, many nanostructured carbon materials including fullerene [18], graphene [19,20], carbon nanotubes (CNTs) [21][22][23], three-dimensionally ordered macroporous (3DOM) carbon [24] and colloid-imprinted mesoporous (CIM) carbon [25] have been utilized as ion-to-electron transducers in solid-contact ISE.…”

Section: Introductionmentioning

confidence: 99%

A simple approach for fabricating solid-contact ion-selective electrodes using nanomaterials as transducers

Liang

Yin

Qin

2015

Analytica Chimica Acta

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A general method for fabricating nanomaterials based solid-contact ISEs is developed. The mixture of an ionic liquid and a nanomaterial is used as intermediate layer.The detection limits of the proposed sensors are in the nanomolar range. The developed electrodes exhibit a good response time and excellent stability. A simple and robust approach for the development of solid-state ion-selective electrodes (ISEs) using nanomaterials as solid contacts is described. The electrodes are fabricated by using the mixture of an ionic liquid (IL) and a nanomaterial as intermediate layer, formed by melting the IL. Tetradodecylammonium tetrakis(4-chlorophenyl)borate (ETH 500) is chosen as an model of IL to provide strong adhesion between the inner glassy carbon electrode and the intermediate layer. Nanomaterials including single-walled carbon nanotubes (SWCNTs) and graphene were used as active ion-to-electron transducers between the glassy carbon electrode and the ionophore-doped ISE membrane. By using the proposed approach, the solid-contact Cu 2+ -and Pb 2+ -selective electrodes based on ETH 500/SWCNTs and ETH 500/ graphene as transducers, respectively, have been fabricated. The proposed electrodes show detection limits in the nanomolar range and exhibit a good response time and excellent stability.

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“…Moreover, they are usually developed using microfabrication techniques, and consequently they display high production costs. The appearance of potentiometric all-solid-state aptasensors other than FETs made it possible to overcome most of these problems [8]. …”

Section: Introductionmentioning

confidence: 99%

Protein Detection with Potentiometric Aptasensors: A Comparative Study between Polyaniline and Single‐Walled Carbon Nanotubes Transducers

Düzgün

Hassan

Levón

et al. 2013

The Scientific World Journal

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A comparison study on the performance characteristics and surface characterization of two different solid-contact selective potentiometric thrombin aptasensors, one exploiting a network of single-walled carbon nanotubes (SWCNTs) and the other the polyaniline (PANI), both acting as a transducing element, is described in this work. The molecular properties of both SWCNT and PANI surfaces have been modified by covalently linking thrombin binding aptamers as biorecognition elements. The two aptasensors are compared and characterized through potentiometry and electrochemical impedance spectroscopy (EIS) based on the voltammetric response of multiply charged transition metal cations (such as hexaammineruthenium, [Ru(NH3)6]3+) bound electrostatically to the DNA probes. The surface densities of aptamers were accurately determined by the integration of the peak for the reduction of [Ru(NH3)6]3+ to [Ru(NH3)6]2+. The differences and the similarities, as well as the transduction mechanism, are also discussed. The sensitivity is calculated as 2.97 mV/decade and 8.03 mV/decade for the PANI and SWCNTs aptasensors, respectively. These results are in accordance with the higher surface density of the aptamers in the SWCNT potentiometric sensor.

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Nanostructured materials in potentiometry

Cited by 87 publications

References 71 publications

Solid-state reference electrodes based on carbon nanotubes and polyacrylate membranes

Solid-state reference electrodes based on carbon nanotubes and polyacrylate membranes

A simple approach for fabricating solid-contact ion-selective electrodes using nanomaterials as transducers

Protein Detection with Potentiometric Aptasensors: A Comparative Study between Polyaniline and Single‐Walled Carbon Nanotubes Transducers

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