scholarly journals Selective Thallium (I) Ion Sensor Based on Functionalised ZnO Nanorods

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Z. H. Ibupoto ◽  
Syed M. Usman Ali ◽  
K. Khun ◽  
Magnus Willander
Keyword(s):  
High Selectivity ◽  
Zno Nanorods ◽  
High Sensitivity ◽  
Fast Response ◽  
Indicator Electrode ◽  
Coated Glass Substrate ◽  
Ion Sensor ◽  
Potentiometric Response ◽  
Growth Method

Well controlled in length and highly aligned ZnO nanorods were grown on the gold-coated glass substrate by hydrothermal growth method. ZnO nanorods were functionalised with selective thallium (I) ion ionophore dibenzyldiaza-18-crown-6 (DBzDA18C6). The thallium ion sensor showed wide linear potentiometric response to thallium (I) ion concentrations ( M to  M) with high sensitivity of 36.87 ± 1.49 mV/decade. Moreover, thallium (I) ion demonstrated fast response time of less than 5 s, high selectivity, reproducibility, storage stability, and negligible response to common interferents. The proposed thallium (I) ion-sensor electrode was also used as an indicator electrode in the potentiometric titration, and it has shown good stoichiometric response for the determination of thallium (I) ion.

scholarly journals Neodymium(III) PVC Membrane Electrodchemical Sensor Based on N-benzoylethylidene-2-aminobenzylamine

2012 ◽  
Vol 9 (4) ◽  
pp. 1941-1950 ◽  
Author(s):  
Hassan Ali Zamani ◽  
Mojdeh Zaferoni ◽  
Soraia Meghdadi
Keyword(s):  
Alkaline Earth ◽  
High Selectivity ◽  
Pvc Membrane ◽  
Indicator Electrode ◽  
Solution Ph ◽  
Response Characteristics ◽  
Potentiometric Response ◽  
Nernstian Slope ◽  
Mouth Wash

The N-benzoylethylidene-2-aminobenzylamine (BEA) was used as a suitable ionophore in construction of neodymium ion selective electrode. The electrode with composition of 30% PVC, 58% solvent mediator (NB), 2% ionophore (BEA) and 10% anionic additive (OA) shows the best potentiometric response characteristics. The Nd3+sensor exhibits a Nernstian slope of 21.2 ± 0.2 mV decade-1over the concentration range of 1.0 × 10-6to 1.0 × 10-2mol L-1, and a detection limit of 6.3 × 10-7mol L-1of Nd3+ions. The potentiometric response of the sensor is independent of the solution pH in the range of 2.4–8.5. It has a very short response time, in the whole concentration range (~7 s), and can be used for at least eight weeks. The proposed sensor revealed high selectivity with respect to all common alkali, alkaline earth, transition and heavy metal ions, including members of the lanthanide family other than Nd3+. The Nd3+sensor was successfully applied as an indicator electrode in the potentiometric titration of Nd3+ions with EDTA. The electrode was also employed for the determination of the fluoride ion in two mouth wash preparations.

scholarly journals Determination of Nd3+Ions in Solution Samples by a Coated Wire Ion-Selective Sensor

2012 ◽  
Vol 9 (1) ◽  
pp. 83-88 ◽  
Author(s):  
Hassan Ali Zamani
Keyword(s):  
High Selectivity ◽  
Water Solution ◽  
Fast Response ◽  
Indicator Electrode ◽  
Coated Wire ◽  
Nernstian Slope ◽  
Ph Range ◽  
Coated Wire Electrode ◽  
Selective Sensor

A new coated wire electrode (CWE) using 5-(methylsulfanyl)-3-phenyl-1H-1,2,4-triazole (MPT) as an ionophore has been developed as a neodymium ion-selective sensor. The sensor exhibits Nernstian response for the Nd3+ions in the concentration range of 1.0×10−6-1.0×10−2M with detection limit of 3.7×10−7M. It displays a Nernstian slope of 20.2±0.2 mV/decade in the pH range of 2.7–8.1. The proposed sensor also exhibits a fast response time of ∼5 s. The sensor revealed high selectivity with respect to all common alkali, alkaline earth, transition and heavy metal ions, including members of the lanthanide family other than Nd3+. The electrode was used as an indicator electrode in the potentiometric titration of Nd(III) ions with EDTA. The electrode was also employed for the determination of the Nd3+ions concentration in water solution samples.

scholarly journals Application ofN-Quinoline-2-carboxamido-8-aminoquinoline in Fabrication of a Ho(III)-PVC Membrane Sensor

2011 ◽  
Vol 8 (s1) ◽  
pp. S237-S244 ◽  
Author(s):  
Hassan Ali Zamani ◽  
Samaneh Langroodi ◽  
Soraia Meghdadi
Keyword(s):  
Heavy Metal ◽  
Dynamic Range ◽  
Fast Response ◽  
Pvc Membrane ◽  
Indicator Electrode ◽  
Membrane Composition ◽  
Membrane Sensor ◽  
Potentiometric Response ◽  
Mouth Wash

TheN-quinoline-2-carboxamido-8-aminoquinoline (QCA) was used as a suitable ion carrier in the construction of a Ho(III) PVC-based membrane sensor. This sensor demonstrated good selectivity and sensitivity towards the holmium ion for a broad variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The proposed electrode exhibits a linear dynamic range between 1.0×10-6and 1.0×10-2M, with a near Nernstian slope of 20.4±0.3 mV per decade and a detection limit of 4.2×10-7M. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 56% nitrobenzene, 2% sodium tetraphenyl borate, 10% oleic acid and 2% QCA. The potentiometric response of the constructed electrode is pH independent in the range of 2.4-7.4. The sensor possesses the advantages of short conditioning time, fast response time (∼ 5 s) and especially, good selectivity towards transition and heavy metal and some mono, di and trivalent cations. The Ho3+sensor was successfully applied as an indicator electrode in the potentiometric titration of Ho(III) ions with EDTA. The electrode was also used for the determination of Ho3+ions in mixtures of different ions and the determination of the fluoride ion in mouth wash solutions.

scholarly journals Construction of Tb3+ PVC-MembraneElectrode Based on N,N’-Bis(pyrrolylmethylene)-2-aminobenzylamine

2011 ◽  
Vol 8 (s1) ◽  
pp. S203-S210 ◽  
Author(s):  
Hassan Ali Zamani ◽  
Zynab Rafati ◽  
Soraia Meghdadi
Keyword(s):  
Heavy Metal Ions ◽  
Alkaline Earth ◽  
Pvc Membrane ◽  
Indicator Electrode ◽  
Fluoride Ion ◽  
Solution Ph ◽  
Potentiometric Response ◽  
Nernstian Slope ◽  
Mouth Wash

In this work, we report as new Tb3+-PVC membrane sensor based onN,N’-bis(pyrrolylmethylene)- 2-aminobenzylamine (PMA) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of PMA with oleic acid (OA) as anionic additives and acetophenone (AP) as plasticizing solvent mediators. The Tb3+sensor exhibits a Nernstian slope of 19.7±0.4 mV per decade over the concentration range of 1.0×10-5to 1.0×10-2M and a detection limit of 4.6×10-6M of Tb3+ions. The potentiometric response of the sensor is independent of the solution pH in the range of 2.9–8.1. It has a very short response time, in the whole concentration range (∼5 s). The recommended sensor revealed comparatively good selectivity with respect to most alkali, alkaline earth, some transition and heavy metal ions. It was successfully employed as an indicator electrode in the potentiometric titration of Tb(III) ions with EDTA. The electrode was also employed for the determination of the fluoride ion in two mouth wash preparations and the determination of Tb3+ions concentration in mixtures of three different ions.

Sensitive and rapid biosensor for the determination of rhamnose based on the catalytic effect of the oxidation of calcein by H2O2

2014 ◽  
Vol 6 (21) ◽  
pp. 8779-8784
Author(s):  
Jia-Ming Liu ◽  
Zhen-bo Liu ◽  
Qitong Huang ◽  
Xiaofeng Lin
Keyword(s):  
Catalytic Reaction ◽  
High Selectivity ◽  
Catalytic Effect ◽  
High Sensitivity ◽  
Fluorescence Method

We report a new catalytic biosensor for the detection of rhamnose (Rha) based on combining the high sensitivity of a fluorescence method with the high selectivity of a catalytic reaction.

Dysprosium(III) Ion-Selective Electrochemical Sensor Based on 6-Hydrazino-1,5-diphenyl-6,7-dihydropyrazolo[3,4-d]pyrimidine-4(5H)-imine

2007 ◽  
Vol 72 (9) ◽  
pp. 1189-1206 ◽  
Author(s):  
Hassan Ali Zamani ◽  
Mohammad Reza Ganjali ◽  
Nasim Seifi
Keyword(s):  
Heavy Metal Ions ◽  
Alkaline Earth ◽  
Fast Response ◽  
Sensor Response ◽  
Indicator Electrode ◽  
Selective Electrode ◽  
Membrane Sensor ◽  
Sensing Material ◽  
Ph Range

A Dy(III) ion-selective electrode based on 6-hydrazino-1,5-diphenyl-6,7-dihydropyrazolo[3,4-d]pyrimidine-4(5H)-imine (HDDPI) as an excellent sensing material was developed. The sensor exhibits a Nernstian behavior (a slope of 19.6 ± 0.3 mV per decade) over a wide concentration range (from 1.0 × 10-1 to 8.0 × 10-7 M Dy) with a detection limit of 4.2 × 10-7 M. The sensor response is independent of pH of the solution in the pH range 3.5-8.3. The sensor possesses the advantages of short conditioning time, fast response time (<10 s) and in particular, good selectivity and sensitivity to the dysprosium ion in the presence of a variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor also showed a great enhancement in selectivity coefficients for dysprosium ions, in comparison with the formerly mentioned dysprosium sensors. The electrode can be used for at least 10 weeks without any considerable divergence in the potentials. The proposed electrode was successfully used as an indicator electrode in potentiometric titration of Dy(III) ions with EDTA. The membrane sensor was also used in the determination of concentration of F- ions in some mouth washing solutions and in the Dy3+ recovery from solution.

scholarly journals Potentiometric Determination of Prednisolone in Pharmaceutical Formulations

2021 ◽  
Vol 7 (3) ◽  
pp. 742-748
Author(s):  
A. Zaki Gehan ◽  
M.E. Hassouna Mohammed
Keyword(s):  
Detection Limit ◽  
Linear Response ◽  
Pharmaceutical Formulations ◽  
Fast Response ◽  
Indicator Electrode ◽  
Selective Electrode ◽  
Sodium Tetraphenyl Borate ◽  
Tetraphenyl Borate ◽  
Borate Solution

In this present work, a prednisolone ion selective electrode (PRED-ISE) has been developed. The electrode shows linear response towards prednisolone in the range 3.0×10−6 – 8.6×10−3 M with a detection limit of 2.5×10−6. PRED-ISE was used as an indicator electrode for the potentiometric titration of different concentrations of standard prednisolone against standardized sodium tetraphenyl borate solution and in tablets. The electrode manifests advantages of low resistance, fast response and, most importantly, good selective relativity to a variety of other cations.

scholarly journals Characterization and mitigation of water vapor effects in the measurement of ozone by chemiluminescence with nitric oxide

2014 ◽  
Vol 7 (5) ◽  
pp. 1231-1244 ◽  
Author(s):  
P. Boylan ◽  
D. Helmig ◽  
J.-H. Park
Keyword(s):  
Nitric Oxide ◽  
Water Vapor ◽  
High Sensitivity ◽  
Fast Response ◽  
Permeable Membrane ◽  
Gas Cylinder ◽  
Signal Correction ◽  
Ozone Fluxes ◽  
High Sensitivity Detection

Abstract. Laboratory experiments were conducted to investigate the effects of water vapor on the reaction of nitric oxide with ozone in a gas-phase chemiluminescence instrument used for fast response and high sensitivity detection of atmospheric ozone. Water vapor was introduced into a constant level ozone standard and both ozone and water vapor signals were recorded at 10 Hz. The presence of water vapor was found to reduce, i.e. quench, the ozone signal. A dimensionless correction factor was determined to be 4.15 ± 0.14 × 10−3, which corresponds to a 4.15% increase in the corrected ozone signal per 10 mmol mol−1 of co-sampled water vapor. An ozone-inert water vapor permeable membrane (a Nafion dryer with a counterflow of dry air from a compressed gas cylinder) was installed in the sampling line and was shown to remove the bulk of the water vapor in the sample air. At water vapor mole fractions above 25 mmol mol−1, the Nafion dryer removed over 75% of the water vapor in the sample. This reduced the required ozone signal correction from over 11% to less than 2.5%. The Nafion dryer was highly effective at reducing the fast fluctuations of the water vapor signal (more than 97%) while leaving the ozone signal unaffected, which is a crucial improvement for minimizing the quenching interference of water vapor fluxes and required density correction in the determination of ozone fluxes by the eddy covariance technique.

scholarly journals An enzymatic glucose detection sensor using ZnO nanostructure

MRS Advances ◽  
2016 ◽  
Vol 1 (13) ◽  
pp. 847-853 ◽  
Author(s):  
Mohammed Marie ◽  
Sanghamitra Mandal ◽  
Omar Manasreh
Keyword(s):  
Glucose Sensor ◽  
Limit Of Detection ◽  
Sol Gel ◽  
Zno Nanorods ◽  
High Sensitivity ◽  
High Density ◽  
Glucose Detection ◽  
Zno Nanostructure ◽  
Growth Method ◽  
Gel Technique

Abstract:Glucose sensor based on ITO/ZnO NRs/GOx/nafion is fabricated and tested under different glucose concentrations. Hydrothermal growth method along with sol-gel technique is used to grow high quality ZnO nanorods that have well-alignment and high density with an acceptable aspect ratio. The as-grown of ZnO nanorods are used to fabricate a working electrode that can be used for glucose detection in blood after a modification process with GOx and nafion membrane. Annealing at 110 °C helped in improves the crystallinity of the seed layer and as a result, a high density and well alignment as-grown ZnO nanorods were obtained. High sensitivity and short response time were obtained from the fabricated device with an acceptable lower limit of detection.

scholarly journals A Simple and Efficient Visible Light Photodetector based on Co3O4/ZnO Composite

2021 ◽  
Author(s):  
Aneela Tahira ◽  
Raffaello Mazzaro ◽  
Federica Rigoni ◽  
Ayman Nafady ◽  
Shoyebmohamad F Shaikh ◽  
...  
Keyword(s):  
Visible Light ◽  
Zno Nanorods ◽  
Fast Response ◽  
Buffer Layers ◽  
Cubic Phases ◽  
Light Absorber ◽  
Aqueous Chemical Growth ◽  
Growth Method ◽  
P Type ◽  
First Time

Abstract Herein, we propose for the first time visible light photodetector based on n-type ZnO nanorods decorated with p-type Co3O4 nanowires. The heterojunction was fabricated on fluorine doped tin oxide (FTO) glass substrate by low temperature aqueous chemical growth method. ZnO exhibits nanorod morphology and cobalt oxide possesses nanowire shape with sharp tail. Energy dispersive spectroscopy (EDS) confirmed the presence of Zn, O, and Co elements in the heterojunction. ZnO and Co3O4 have hexagonal and cubic phases, respectively, as confirmed by XRD. The dense and perpendicular ZnO nanorods are acting as a scattering layer for visible light, while Co3O4 nanowires act as a visible-light absorber. The all oxide p-n junction can operate as visible light photodetector. Furthermore, the heterojunction also shows a reproducible and fast response for the detection of visible light. Optimization of the device is needed (presence of buffer layers, tuning a thickness of the optical absorber) to improve its functionalities.

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