Gold nanoparticles on a thiol-functionalized silica network for ascorbic acid electrochemical detection in presence of dopamine and uric acid

Morais, Andréia de; Silveira, Gustavo; Villis, Paulo Cesar Mendes; Maroneze, Camila M.; Gushikem, Yoshitaka; Pissetti, Fábio L.; Lucho, Alzira Maria Serpa

doi:10.1007/s10008-012-1701-z

Cited by 25 publications

(7 citation statements)

References 62 publications

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“…The present EPU system can open up new opportunities for detection of AA and provide a promising platform for biosensor designs for AA detection. The comparison for sensitivity and detection limit of electrodes modified with different materials for AA sensing is depicted in Table …”

Section: Resultsmentioning

confidence: 99%

Aniline‐nonamer segmented polyurea: A facile electrocatalyst for detection of ascorbic acid

Arukula

Thota

Boga

et al. 2018

J of Applied Polymer Sci

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An unprecedented A‐B‐A type block copolymer electroactive polyurea (EPU) is designed and synthesized with tetraaniline dimer and 1,4‐phenylenediamine via an oxidative coupling, where aniline–nonamer and hexamethylene di‐urea constitute two segments. The EPU was characterized by spectral techniques such as Fourier transform infrared spectroscopy, nuclear magnetic resonance, and UV–vis spectra. The structural characterization of the prepared EPU was obtained by powder X‐ray diffraction and X‐ray photoelectron spectroscopy techniques. EPU reorganizes into core–shell microcapsules in presence of aqueous acetic acid/n‐octane interface. These microcapsules exhibited a wide range of pH responses in their absorption spectrum (UV–vis). The EPU is modified as carbon paste electrode which exhibits a remarkable electrocatalytic oxidation of ascorbic acid (AA, Vitamin C) in 0.2 M and pH 7.0 phosphate buffer solution. The carbon paste electrode is useful in sensing as low as 50 µM of ascorbic acid. This can open up new opportunities for fast, simple detection of AA providing a promising platform for sensor/biosensor designs for AA detection. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46630.

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Section: Resultsmentioning

confidence: 99%

Aniline‐nonamer segmented polyurea: A facile electrocatalyst for detection of ascorbic acid

Arukula

Thota

Boga

et al. 2018

J of Applied Polymer Sci

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“…One way to improve the properties of polythiophenes is by the combination with metal nanoparticles to produce hybrid materials, which can be used for the optical and electrical signals amplification in conjugated polymer‐based devices . Metal nanoparticles may have different sizes, shapes and chemical features, due to the possibility of being modified with a wide variety of substances, such as alkanethiols, amines, and various polymers, including conjugated polymers . Among the shape of nanoparticles, the spherical ones are the most common reported in the literature due to their ease of synthesis, and also because they can be obtained by either aqueous or organic phases …”

Section: Introductionmentioning

confidence: 99%

Synthesis of a nanocomposite containing a water-soluble polythiophene derivative and gold nanoparticles

Sanfelice

Pavinatto

Gonçalves

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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This paper reports on a facile method for synthesizing gold nanoparticles (AuNps) with diameter around 5 nm encapsulated with water-soluble polythiophene sulfonate poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] sodium salt (PTS) and their physical-chemical characterization. The synthesis of hybrid materials of polythiophene derivatives and gold nanoparticles is a way to improve the polymer properties, mainly in application for chemical and optical sensing platforms. The AuNps were prepared by reducing gold salt with acid aqueous sodium citrate by the Turkvich method in the presence of PTS, and both PTS and citrate helped to stabilize the AuNps. The suspensions of AuNp:PTS presented good chemical and photostability for long period of storage. The nanoparticles encapsulated with the polymer presented smaller diameters than those obtained using only sodium citrate, according to scanning electron microscopy images. The AuNps obtained were used for fabrication LbL films with commercial chitosan, which were characterized by impedance spectroscopy measurements. The results showed that the charge transfer resistance values (R ct ) decrease as the average diameter of the AuNps decreases and the proportion of PTS increases in the nanocomposite. Such increase of the nanocomposite conductivity, given by the low values of R ct , indicates that the novel film architecture developed is promising for chemical sensing applications.

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“…Thus, an electrochemical assay for DA is still a major challenge for analysts. 43 To solve these problems, various modied electrodes have been developed. These modied electrodes make a full use of carbon, 44,45 ionic liquids, 46 nanotubes, 47 nanowires, 48 nanoparticles, 49,50 and conducting polymer lms.…”

Section: Introductionmentioning

confidence: 99%

Using AuCo alloy nanoparticles/HS-graphene modified electrode for the selective determination of dopamine, ascorbic acid and uric acid

et al. 2014

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Gold nanoparticles on a thiol-functionalized silica network for ascorbic acid electrochemical detection in presence of dopamine and uric acid

Cited by 25 publications

References 62 publications

Aniline‐nonamer segmented polyurea: A facile electrocatalyst for detection of ascorbic acid

Aniline‐nonamer segmented polyurea: A facile electrocatalyst for detection of ascorbic acid

Synthesis of a nanocomposite containing a water-soluble polythiophene derivative and gold nanoparticles

Using AuCo alloy nanoparticles/HS-graphene modified electrode for the selective determination of dopamine, ascorbic acid and uric acid

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