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Journal ArticleDOI

Polynuclear Nickel Hexacyanoferrate/Graphitized Mesoporous Carbon Hybrid Chemically Modified Electrode for Selective Hydrazine Detection

TL;DR: In this paper, a hybrid polynuclear nickel hexacyanoferrate (NiHCFe)/graphitized mesoporous carbon-modified glassy carbon electrode (GCE/NiHC Fe@GMC) has been prepared by a sequential method using electrodeposited Ni on a GMC-modified carbon electrode.
Abstract: A hybrid polynuclear nickel hexacyanoferrate (NiHCFe)/graphitized mesoporous carbon- (GMC-) modified glassy carbon electrode (GCE/NiHCFe@GMC) has been prepared by a sequential method using electrodeposited Ni on a GMC-modified glassy carbon electrode (GCE/Ni@GMC) as a template and [Fe(CN)6]3− as an in-situ chemical precipitant, without any additional interlinking agent. Physicochemical and electrochemical characterizations reveal the presence of NiHCFe units within the porous sites of the GMC. The GCE/NiHCFe@GMC electrode showed highly stable and well-defined redox behaviors with surface-confined electron-transfer mechanism in a pH 7 phosphate buffer solution. The GCE/NiHCFe@GMC showed about 20 times enhancement in hydrazine oxidation peak current along with 500 mV reduction in overpotential over the corresponding unmodified GCE/GMC. Hydrazine calibration plots by CV and amperometric i-t methods were linear up to 1 mM and 220 μM with current sensitivity values of 15.86 μA/mM and 7.37 nA/μM, respectively. Calculated detection limit by the amperometric i-t method was 23.2 nM. The hybrid GCE/NiHCFe@GMC exhibits remarkable tolerance to important industrial and biological interferents. Finally determination of hydrazine in cigarette smoke sample was successfully demonstrated.

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Citations
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Journal ArticleDOI
TL;DR: A graphitized mesoporous carbon modified glassy carbon electrode (GCE/GMC) prepared by drop coating method without any pre-anodization of the underlying GCE or external binder/matrix was demonstrated for simultaneous electrochemical oxidation of guanine (G) and adenine (A) at oxidation potentials 0.60 and 0.85 V vs. Ag/AgCl, respectively, in the presence of thymine (T) by differential pulse voltammetric method in pH 7 phosphate buffer solution.
Abstract: A graphitized mesoporous carbon modified glassy carbon electrode (GCE/GMC) prepared by drop coating method without any pre-anodization of the underlying GCE or external binder/matrix, has been demonstrated for simultaneous electrochemical oxidation of guanine (G) and adenine (A) at oxidation potentials 0.60 and 0.85 V vs. Ag/AgCl, respectively, in the presence of thymine (T) by differential pulse voltammetric method in pH 7 phosphate buffer solution. Control voltammetric experiments with unmodified GCE, graphite nanopowder and multiwalled carbon nanotube modified electrodes yielded either feeble or with high-background current responses. Interestingly, the GCE/GMC showed highly efficient, stable and well-defined voltammetric signals. Thymine oxidation signal noticed discretely at 1.15 V vs. Ag/AgCl on the GCE/GMC was not influenced for the simultaneous determination of G and A. Constructed DPV calibration graphs were linear in the range of 25–200 and 25–150 μM, respectively, for the G and A. Corresponding detection limit (S/N = 3) values are 0.76 and 0.63 μM. Real sample analyses for the detection of G and A concentrations in calf-thymus DNA (detected [G]/[A] ratio = 0.82), beef brain and beef liver were successfully demonstrated with recovery values ~100 %.

54 citations

Journal ArticleDOI
TL;DR: An amperometric biosensor has been developed that uses the immobilized synthetic peptide, NFO4; which possesses a high binding affinity and thus provides for molecular recognition of OTA; simulating the mycotoxin-specific antibody.

26 citations

Journal ArticleDOI
TL;DR: An amperometric sulfite sensor was fabricated based on nickel hexacyanoferrate (NiHCF) electrodeposited on a layer of ordered mesoporous carbon covering on a gold electrode surface as mentioned in this paper.

19 citations

Journal ArticleDOI
TL;DR: In this article, a new strategy for simple and quick detection of nickel impurity in pristine single walled carbon nanotubes (SWCNT*Ni, *Ni = ǫ-nickel impurity) as redox active nickel hexacyanoferrate hybrid was proposed by potential cycling of the pristine SWCNT modified glassy carbon electrode with ferricyanide in pH 2 KCl-HCl solution.
Abstract: Residual metal impurities in the pristine carbon nanotubes (CNT) have been found to show an exceptional electrochemical and electro-catalytic properties. To quantify the impurities, sophisticated instrumental techniques and time consuming electrochemical methods have been adopted. Herein, we report, a new strategy for simple and quick detection of nickel impurity in pristine single walled carbon nanotube (SWCNT*Ni, *Ni = nickel impurity) as redox active nickel hexacyanoferrate hybrid (SWCNT*Ni-HCF) by potential cycling of the pristine SWCNT modified glassy carbon electrode (GCE/SWCNT*Ni) with ferricyanide in pH 2 KCl-HCl solution at a scan rate 50 mV s−1 (t = 12 ± 1 min). Quantitative stripping of the nickel as nickel ion that combines with ferricyanide to form Ni-HCF hybrid on the SWCNT surface (i.e., GCE/SWCNT*Ni-HCF) is found to be the mechanism for the observation. In-situ derivatization of NiO modified GCE with ferricyanide was studied as an important control experiment. A calibration plot was constructed by plotting surface excess value of GCE/Ni-HCF obtained by cyclic voltammetric experiment against NiO loading on unmodified GCE surface. Unknown concentration of nickel in the pristine SWCNT was then determined by substituting surface excess value of SWCNT*Ni-HCF in the calibration plot. Obtained value is comparable with the result of continuum source electro-thermal atomic absorption spectrometry method.

11 citations

Journal ArticleDOI
Shengjun Lu1, Pan Lu1, Cheng Li1, Caihong Wang1, Jie Yu 
TL;DR: In this paper, a sensor for sensitive detection of captopril was developed based on a copper hexacyanoferrate/ordered mesoporous carbon-modified glassy carbon electrode (CuHCF/OMC/GCE).
Abstract: Using an electrochemical polymerization process, a copper hexacyanoferrate/ordered mesoporous carbon-modified glassy carbon electrode (CuHCF/OMC/GCE) was prepared. The performance of CuHCF/OMC was compared with that of CuHCF and the properties of the new material were improved. A sensor for sensitive detection of captopril was developed based on CuHCF/OMC-modified glassy carbon electrode. The composition and morphology of the as-prepared CuHCF/OMC products were characterized by energy-dispersive X-ray spectroscopy and scanning electron microscopy. The electrochemical behaviour and electrocatalytic performance of the CuHCF/OMC-modified glassy carbon electrode towards the oxidation of captopril were evaluated by cyclic voltammetry. Results showed that the CuHCF/OMC-modified electrode exhibits two well-defined redox peaks. The linear range for the detection of captopril was from 1.0 × 10–5 to 2.7 × 10–3 M, with a correlation coefficient of 0.999, and the detection limit was 1.2 × 10–6 M based on a signal-to-noise ratio of 3.

6 citations

References
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Book
01 Jan 1983
TL;DR: The Merck Index as discussed by the authors is a one-volume encyclopedia of chemicals, drugs and biologicals that contains more than 10,000 monographs, each monograph is a concise description of a single substance or a small group of closely related compounds.
Abstract: The Merck Index is a one-volume encyclopedia of chemicals, drugs and biologicals that contains more than 10,000 monographs. Each monograph in this authoritative reference source is a concise description of a single substance or a small group of closely related compounds. Compounds included: * human and veterinary drugs * biotech drugs and monoclonal antibodies * substances used for medical imaging * biologicals and natural products * plants and traditional medicines * nutraceuticals and cosmeceuticals * agriculturals, pesticides and herbicides * Organic chemicals used in research * Food additives and supplements * dyes, colors and indicators * environmentally significant substances Information provided: * chemical, common and generic names * Over 15,000 trademarks and associated companies * CAS Registry Numbers for over 12,000 compounds * Over 8,500 chemical structures * molecular formulae, weights and percentage composition * capsule statements identifying compound classes and scientific significance * scientific and patent literature references * physical and toxicity data * therapeutic and commercial uses * caution and hazard information In addition, there are more than 700 new and completely revised monographs, thousands of new references, trademarks and uses added to existing monographs. Now includes a companion CD-ROM which features 989 monographs no longer available in print, organic name reactions, supplemental tables and a new user interface for user-friendly searching. Features of the CD: * Searchable by keywords, references, and numerical properties * Search the complete contents of the 14th edition, plus nearly a thousand monographs archived from previous editions * Comes with a free one-year subscription to the Merck Index Internet Edition * Windows-compatible CD powered by CambridgeSoft's ChemFinder * Extensively revised supplemental tables now including acronyms, vaccines, and physical constants * More than 70 pages of hard to find information in one easy-to-use place

4,478 citations

Journal ArticleDOI
TL;DR: In this paper, ZnO nanoflowers were synthesized by a simple process (ammonia-evaporation-induced synthetic method) and were applied to the hydrazine electrochemical sensor.

188 citations

Journal ArticleDOI

168 citations


"Polynuclear Nickel Hexacyanoferrate..." refers background or methods in this paper

  • ...5 ng/cigarette measured by derivatization-based gas chromatographic method previously [8]....

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  • ...Hydrazine itself or its sulphate salt has been used in the treatment of tuberculosis, sickle cell anemia, and some of the chronic illnesses [7, 8]....

    [...]