Ion Sensor
Mostrando 1-12 de 115 artigos, teses e dissertações.
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1. A novel fluorescence sensor for the detection of chloride ion in artificial sweat and environmental water with nitrogen-doped graphene quantum dots
A new fluorescent detection route for chloride ion was designed with Nitrogen-doped graphene quantum dots (N-GQDs), which were prepared by a traditional hydrothermal method with citric acid as carbon source and urea as nitrogen source. The prepared N-GQDs solution was light yellow, and the freeze-dried solid was black. It emitted blue light under ultraviolet
Química Nova. Publicado em: 2022
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2. A Highly Selective Colorimetric Sensor for Cysteine Detection
Introducing a hybrid xanthene as a fluorophore, an ‘ensemble’-based fluorescent sensor (E)-2-(6-(diethylamino)-2-((2-hydroxyphenylimino)methyl)-3-oxo-3H-xanthen-9-yl)benzoic acid (a) was designed and synthesised for detection of cysteine. Cysteine can release CuII ion from the non-fluorescent a-CuII complex. Then hydrolytic cleavage of Schiff base a prod
J. Braz. Chem. Soc.. Publicado em: 2020-02
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3. A HIGHLY SELECTIVE FLUORESCENT SENSOR FOR DETECTION OF TRIVALENT METAL IONS BASED ON A SIMPLE SCHIFF-BASE
A simple and easily synthesized fluorescent sensor L, based on condensation reaction of 1-Naphthylamine and terephthalaldehyde, was synthesized and characterized systemically. Both UV-vis and fluorescence spectroscopic studies indicated that the sensor L showed good selectivity toward trivalent metal ions (such as Al3+, Fe3+, Cr3+, La3+ and Ce3+) over other
Quím. Nova. Publicado em: 2018-06
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4. A Novel Sensitive Bulk Optode Based on 5-Br Salophen as an Ionophore for Determination of Zinc Ion in Real Samples
An optical sensing film was fabricated for sensitive determination of zinc ion in aqueous solutions. The optical sensor was prepared by synthesized ionophore, 5-Br salophen, dioctyl sebacate (DOS) as a plasticizer, sodium tetraphenyl borate (NaTPB) as a lipophilic anionic additive in a poly(vinyl chloride) membrane. The optode response is based on the cation
J. Braz. Chem. Soc.. Publicado em: 2018-03
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5. A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors
This paper presents a low-cost reflectometer for selective detection of Cu2+. The reflectometer is based on an emission light source using five light-emitting diodes at different wavelengths and a detector using a webcam. The samples were prepared using a filter paper-based colorimetric sensor with ascorbic acid-based quinoxaline derivative. Video analysis u
J. Braz. Chem. Soc.. Publicado em: 2017-12
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6. Developing Fast and Facile Method for Speciation Analysis of Vanadium (V/IV) Ions with Calmagite Immobilization on Triacetyl Cellulose Membrane in Water Samples
An inexpensive and fast vanadium [(IV), (V)] speciation method was performed by using optical chemical sensor that incorporates lipophilized calmagite (Cal) with cetyl pyridinium chloride (CPC) as a suitable ligand on triacetylcellulose membrane in aqueous solutions prior to UV-Vis spectrometric determination. Absorbance decrease of the optode in pH 6 at 490
J. Braz. Chem. Soc.. Publicado em: 2015-03
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7. Filmes de polipirrol aplicados no desenvolvimento de eletrodos descartáveis seletivos a íons fluoreto
O presente manuscrito descreve o desenvolvimento de um sensor descartável sensível e seletivo baseado em filmes de polipirrol dopados (PPy) para determinação íons fluoreto. Os íons fluoretos foram incorporados na matriz PPy durante a polimerização eletroquímica realizada em condições galvanostáticas em um eletrodo compósito etileno vinil acetato
Polímeros. Publicado em: 2014-08
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8. A new triazene ligand immobilized on triacetylcellulose membrane for selective determination of mercury ion
Este trabalho apresenta um novo sensor químico óptico, simples e de baixo custo, para a determinação de íon mercúrio (II) em solução aquosa. A membrana sensível a mercúrio foi preparada pela incorporação de triazina ((E)-1-(2-etoxifenil)-3-(4-nitrofenil) triazol-1-ene como um ligante adequado para Hg(II) sobre uma membrana de triacetilcelulose. O
J. Braz. Chem. Soc.. Publicado em: 2014-05
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9. Potentiometric determination of Nickel (II) ion using 2-hydroxy-1-naphthylidene-N-cyanoacetohydrazone as electroactive material
A potentiometric Nickel sensor was prepared using 2-hydroxy-1-naphthylidene-N-cyanoacetohydrazone as electro-active material and epoxy resin as a binding material. A membrane composed of 40% Schiff's base and 60% epoxy resin exhibited the best performance. The membrane showed excellent response in the concentration range of 0.15 ppm to 0.1 mol L- 1 Ni+2 ions
Quím. Nova. Publicado em: 2014
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10. Indium tin oxide synthesized by a low cost route as SEGFET pH sensor
Polycrystalline ITO films with good optoelectronics characteristics and homogeneous surface has been obtained upon annealing at 550 °C in N² atmosphere using a low-cost chemical vapor deposition (CVD) system. The films were evaluated as pH sensors in separative extended gate field-effect transistor (SEGFET) apparatus, exhibiting a sensitivity of 53 mV/pH,
Mat. Res.. Publicado em: 02/07/2013
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11. Plastic membrane, carbon paste and multiwalled carbon nanotube composite coated copper wire sensors for determination of oxeladin citrate using batch and flow injection techniques
A fabricação e as características de desempenho de três novos sensores potenciométricos para a determinação de citrato de oxeladina são descritas. Os sensores propostos incluem um sensor do tipo membrana em plástico PVC, um sensor de pasta de carbono e um sensor de fio de cobre revestido com compósito de nanotubos de carbono de parede múltiplas (M
J. Braz. Chem. Soc.. Publicado em: 2013-04
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12. Electrochemical behavior of ruthenium-hexacyanoferrate modified glassy carbon electrode and catalytic activity towards ethanol electrooxidation
Eletrodo de carbono vítreo quimicamente modificado por filme fino de hexacianoferrato de rutênio (RuHCF) foi preparado pelo método da evaporação da gota. O eletrodo modificado RuHCF exibiu quatro processos redox em meio ácido forte (pH 1,5) atribuídos ao íon Fe(CN)6(3-) e três formas de rutênio (Ru(II), Ru(III) e Ru(IV)), características do óxido
J. Braz. Chem. Soc.. Publicado em: 2013-04