Preparation and characterization of LbL films based on graphene oxide nanoparticles interacting with 3-n-propylpyridinium silsesquioxane chloride

et al. 2020

J. Electrochem. Soc.

Miniaturized pH sensors have attracted the attention mostly due to their applications for monitoring chemical and biological processes. The modification of electrodes by Layer-by-Layer (LbL) technique results in films with nanometric structure for application in devices with different sizes. In this paper, an electrode modified with LbL films of polyaniline-gum Arabic nanocomposite (PANI-GA) and graphene oxide (GO), designed (PANI-GA/GO) 3, was applied as a potentiometric pH sensor based on states of oxidation PANI. The pH measurements were performed in BR buffer solution and a linear range was observed from pH 2 to 7. The detection limit (DL) and quantification limit (QL) were of pH = 0.465 and 1.55, respectively. Analytical curves were obtained in triplicate and inter-assay precision was calculated for the system, demonstrating good results with relative standard deviation (RSD) of 3.7% for five measurements in different days. The (PANI-GA/GO) 3 LbL film showed promising results for its use in the development of potentiometric pH sensor.

Section: Resultsmentioning

confidence: 95%

Electrochemical Performance of pH Sensor Based on LbL Films of Polyaniline-Gum Arabic Nanocomposite and Graphene Oxide

Oliveira

Pscheidt

et al. 2020

J. Electrochem. Soc.

Materials Research Foundations

“…From the inspection of Fig. 7, it is clear that the quantity of NiTsPc 4deposited on the surface of the substrate is always higher to SiPy than SiPy + /NiTsPc 4films [27].…”

Section: Go-propylpyridinium Silsesquioxane Chloride Polymermentioning

confidence: 96%

“…Research on graphene offers great attention due to distinctive characteristics such as high mechanical strength, optical transparency, higher carrier charge mobility, good optical luminescence as well as better high electrical and thermal conductivities [27]. Electrical and optical luminescences drops upon conversion of graphene to graphene oxide.…”

Section: Graphene and Graphene Oxide (Go)mentioning

confidence: 99%

“…GO can form constant stable aqueous colloids which enable the assemblage of macroscopic assemblies by solution processes owing to its hydrophilic nature. This property is mainly considered for large-scale application of graphene oxide [27][28][29]. The electronic properties of graphene oxide are widely affected by oxygen content in the microstructure of graphene oxide.…”

Section: Graphene and Graphene Oxide (Go)mentioning

confidence: 99%

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Electrochemical Super Capacitors Fabricated by the Layer-by-Layer (LbL) Technique

Chinnasamy¹,

Rathanasamy²,

Kanagarajan³

et al. 2018

This chapter provides an overview of current research on electrochemical supercapacitor materials fabricated by the layer-by-layer assembly technique. Emphasis has been given towards the basic principle of supercapacitors and various electrode materials suitable for high-performance supercapacitor applications. The chapter is a detailed discourse regarding the layer-by-layer fabrication technique with their performance and stability. Electrode materials such as metal oxides/hydroxides and conducting polymers exhibit pseudocapacitive behavior whereas carbon-based materials show electrical double layer capacitance. Electrode materials such as, graphene, graphene oxide, carbon nanotubes, polyaniline, and carbon nanofibers, provide high surface area for the layer-by-layer deposition of metal oxides, metal hydroxides, conducting polymers that aid the effective ion diffusion and which in turn enhances the specific capacitance with excellent cyclic stability.

“…For these measurements, the frequency range was chosen based on different studies with LbL films related in the literature. [51][52][53][54][55] Furthermore, it is important to mention that the electrical response depends on the frequency applied. At 1 kHz, the electrical response depends more strongly on the film/electrolyte interaction.…”

Section: Electrochemical Characterization Of the Lbl Filmsmentioning

confidence: 99%

Development of an Electrochemical Sensor Based on LbL Films of Pt Nanoparticles and Humic Acid

Wrobel

et al. 2016

J. Electrochem. Soc.

We report the first attempt to use a naturally occurring biopolymer, such as humic acid (HA), as modifiers to prepare a new organic-inorganic composite film with the 3-n-propylpyridiniumsilsesquioxane chloride Pt nanoparticles (Pt-SiPy+Cl−). By using layer-by-layer (LbL) technique, we have constructed multilayered films, (HA/Pt-SiPy+Cl−)n and (Pt-SiPy+Cl−/HA)n, with adjustable thickness due to negatively charged macromolecule HA, which assists the electrostatic interaction with the positively charged of the Pt-SiPy+Cl− nanohybrid. The combination of these partially charged polyelectrolytes in the LbL film was explored by spectroscopic and electrochemical techniques. The formation of the film (HA/Pt-SiPy+Cl−)n is more efficient, since the presence of the macromolecule in the inner layer provides a greater number of anchoring sites for the hybrid, ensuring a more linear and uniform growth of the LbL films. This film also presented a better electroanalytical response for oxidation of 17α-ethynylestradiol, EE2, indicating that the Pt nanoparticles strongly influences the electrochemical oxidation of estrogen. The analytical curve for EE2 was linear in the concentration range of 1.37 to 21.4 μmol L−1 (R = 0.998), with a detection limit of 1.10 μmol L−1 and quantification limit of 3.68 μmol L−1. The obtained results showed that the synergism between HA and Pt-SiPy+Cl− improves the electroactive properties of the sensor.