Applications of nanomaterials in potentiometric sensors

Yin, Tanji; Qin, Wei

doi:10.1016/j.trac.2013.06.009

Cited by 176 publications

(110 citation statements)

References 77 publications

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“…With the introduction of better molecular receptors, new membrane materials and novel sensing concepts, the performance of ISEs has been dramatically improved during the past two decades [3,4]. A number of ISEs are available with high enough selectivity towards the target analyte to be applied in clinical-, process-and environmental analysis.…”

Section: Introductionmentioning

confidence: 99%

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Ding

Lisak

et al. 2017

Sensors and Actuators B: Chemical

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a b s t r a c tThis work demonstrates a paper-based microfluidic sampling and separation platform that allows potentiometric sensing of chloride ions in presence of strongly interfering salicylate ions using a solid-contact ion-selective electrode as a detector. The device was composed of two pieces of paper with different shapes and pore sizes. A "T" shaped filter paper with a pore size of 12-25 m was used as the detection zone. A filter paper with a pore size of 2.0 m was modified with a complexing agent (Fe 3+ ) and served as the separation zone. The two pieces of the paper were joined together just like a jigsaw. A solid-contact Cl − −selective electrode and a reference electrode were gently pressed onto the detection zone to create a direct contact between the electrodes and the solution absorbed in the paper. Utilizing the possibility to form stable complexes between Fe 3+ and salicylate, the proposed platform enables the separation of salicylate and detection of chloride. This system offers a convenient platform for both sampling and separation of ions, in which sample pretreatment procedures can be simplified or avoided.

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Section: Introductionmentioning

confidence: 99%

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Ding

Lisak

et al. 2017

Sensors and Actuators B: Chemical

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“…Lately, the nanomaterials are widely used in various applications, due to their specific properties. [16,17] They are also suitable for modifying the membranes of the ISEs because of their ability to reduce the signal drift, noise and electrical resistance, improve dynamic response and other response characteristics of the electrode and to prevent leaching of the sensing material from the membrane which leads to prolonged lifetime of the electrode. [18,19] In this paper, multi-walled carbon nanotubes (MWCNTs) were noncovalently functionalized with tetraoctadecylammonium tetraphenylborate (TODA-TPB) and used as sensing material in the liquid membrane electrode.…”

Section: Introductionmentioning

confidence: 99%

Application of a New Functionalized MWCNTs for the Construction of Surfactant Potentiometric Sensors

Petrušić¹,

Samardžić²,

Széchenyi³

et al. 2017

Croat. Chem. Acta

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The multi-walled carbon nanotubes (MWCNTs) were noncovalently functionalized with tetraoctadecylammonium tetraphenylborate (TODA-TPB) used as a sensing element and incorporated into a liquid PVC membrane of the new fast, low drift and sensitive potentiometric sensor (FCNSS) for anionic surfactants (ASs). The sensor exhibits a sub-Nernstian response for both dodecyl sulfate (DS) and dodecylbenzenesulfonate in H2O and in 10 mM Na2SO4.The lower limits of detection for DS and DBS in H2O were 1.5 · 10 -7 and 2.0 · 10 -7 M and in 10 mM Na2SO4, they were 2.0 · 10 -7 M for both surfactants. The response time of the sensor varied between 8 and 12 s, depending on AS concentration and its signal drift was 2.1 mV/hour. The FCNSS exhibited excellent selectivity for DS against nearly all anions usually found in commercial products. It was successfully employed for end-point detection at potentiometric titrations of ASs in detergent products and effluents.

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“…These properties are favorable for acting as solid contacts [21][22][23][24][25][26][27][28][29][30][31][32]. ISEs modified with CNTs show the absence of the aqueous layer between the ion-selective membrane and the electronic conductor [33], which is supposed to influence the detection limit of the sensor [34].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Decreasing the Detection Limit of Gentamicin Ion‐selective Electrodes by Incorporation of Multiwall Carbon Nanotubes (MWCNTs)/Lipophilic Anionic Additives

Khalil

El-aziz

2016

Electroanalysis

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Two novel carbon paste electrodes based on gentamicin‐reineckate (GNS‐RN)/multiwall carbon nanotubes (MWCNTs)/sodium tetraphenyl borate (NaTPB) or potassium tetraphenylborate (KTPB) for potentiometric determination of gentamicin sulfate were constructed. Our endeavors of lowering the detection limit for gentamicin ion‐selective electrodes were described. The paper focused on gentamicin carbon paste electrodes based on GNS‐RN as electroactive material, o‐nitrophenyloctyl ether (o‐NPOE) as plasticizer and incorporation of MWCNTs and lipophilic anionic additives (NaTPB and KTPB) which lower the detection limit of the electrodes showing best results for determination of gentamicin ion. The characteristics of the electrodes, GNS‐RN+NaTPB+MWCNTs (sensor 1) and GNS‐RN+KTPB+ MWCNTs (sensor 2), were measured, showing favorable features as they provided measurements of the potential with near‐Nernstian slopes of 29.6±0.3 and 29.1±0.3 mV/decade over the concentration range of 1.0×10−6–1.0×10−2 mol L−1 and pH ranges 3.0–8.2 and 3.0–8.0 in short response times (6.5 sec). Importantly, the electrodes had low detection limits of 3.0×10−7and 3.4×10−7 mol L−1 for the two sensors, respectively. The sensors showed high selectivity for gentamicin ion with respect to a large number of interfering species. The electrodes were successfully applied for the potentiometric determination of GNS ions in pure state, pharmaceutical preparations and human urine with high accuracy and precision. The results of this study were compared with some previously published data using other analytical methods.

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Applications of nanomaterials in potentiometric sensors

Cited by 176 publications

References 77 publications

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Application of a New Functionalized MWCNTs for the Construction of Surfactant Potentiometric Sensors

A New Approach for Decreasing the Detection Limit of Gentamicin Ion‐selective Electrodes by Incorporation of Multiwall Carbon Nanotubes (MWCNTs)/Lipophilic Anionic Additives

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