Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale

Mazzeu, Maria Alice Carvalho; Faria, Lohana Komorek; Baldan, Maurício Ribeiro; Rezende, Mirabel Cerqueira; Gonçalves, Emerson Sarmento

doi:10.1590/0104-6632.20180351s20160201

Cited by 34 publications

(20 citation statements)

References 42 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The doping level of PANI film can be investigated from the FTIR spectra by calculating the ratio of peak intensity of Q to B ( Figure 4 b). In the chemical structure of PANI, the B ring is the more reduced unit, while the Q ring is the more oxidized unit [ 37 ]. Thus, as the doping level of PANI increases, the ratio of Q to B increases.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Chemical and Electrochemical Stability of Polyaniline-Based Layer-by-Layer Films

Firda

Malik

et al. 2021

Polymers

View full text Add to dashboard Cite

Polyaniline (PANI) has been widely used as an electroactive material in various applications including sensors, electrochromic devices, solar cells, electroluminescence, and electrochemical energy storage, owing to PANI’s unique redox properties. However, the chemical and electrochemical stability of PANI-based materials is not sufficiently high to maintain the performance of devices under many practical applications. Herein, we report a route to enhancing the chemical and electrochemical stability of PANI through layer-by-layer (LbL) assembly. PANI was assembled with different types of polyelectrolytes, and a comparative study between three different PANI-based layer-by-layer (LbL) films is presented here. Polyacids of different acidity and molecular structure, i.e., poly(acrylic acid) (PAA), polystyrene sulfonate (PSS), and tannic acid (TA), were used. The effect of polyacids’ acidity on film growth, conductivity, and chemical and electrochemical stability of PANI was investigated. The results showed that the film growth of the LbL system depended on the acidic strength of the polyacids. All LbL films exhibited improved chemical and electrochemical stability compared to PANI films. The doping level of PANI was strongly affected by the type of dopants, resulting in different chemical and electrochemical properties; the strongest polyacid (PSS) can provide the highest conductivity and chemical stability of conductive PANI. However, the electrochemical stability of PANI/PAA was found to be better than all the other films.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhanced Chemical and Electrochemical Stability of Polyaniline-Based Layer-by-Layer Films

Firda

Malik

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…The doped CPA peak at 1111 cm −1 is a measure of the degree of electrons delocalisation 66 thus, it is the characteristic peak of electrical conductivity of CPA. The intensity of doped CPA peak increases with the introduction of CNMs, and are slightly shifted, which signifies an interaction between the π bonded structure of CNMs and the conjugated structure of CPA, 67‐69 as has been observed in the XRD pattern of the composite Figure 1, where the peak at 25.4° is tapered and more intense as compared to that of CPA. The intensity of this peak is highest in the case of CPA/G‐MWCNTs comparing with the intensity of the other NCs, which agrees well with our increased electrical conductivity.…”

Section: Resultsmentioning

confidence: 58%

Fabrication of conductive cross‐linked polyaniline/G‐MWCNTS core‐shell nanocomposite: A selective sensor for trace determination of chlorophenol in water samples

Katowah

Mohammed

Al‐Eryani

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

The nanocomposites (NCs) of cross-linked polyaniline (CPA) with a variety of carbon nanomaterials (CNMs) (CPA/CNMs NCs) was prepared by the chemical oxidative copolymerization of PANI and p-phenylenediamine (PPDA) with triphenylamine (TPA) in the presence of CNMs. The results of XRD, FTIR and Raman indicated that the CPA/CNMs NCs were effectively synthesized with strong interactions among the constituents. The morphology study demonstrated that CNMs were well coated by CPA and produce a well-aligned nanorod core-shell structure with the large surface area which may be more beneficial to electrical conductivity when used as electrode materials. Differential thermal analysis techniques (TGA-DTG) were used to characterize the thermal stability of NCs. The heat of formation of CPA monomer from TPA, PPDA and aniline (ANI) were computed using Density Functional Theory (DFT) calculations. The NCs of G-MWCNTs demonstrate higher affinity to oxidation of Chlorophenols (CPHs) than glassy carbon electrode (GCE), CPA/GCE and the other NCs. Differential pulse voltammetry (DPV) was used for the trace determination of 2,4-dichlorophenol (2,4-DCP). Under the optimum conditions, the peak current of 2,4-DCP was proportional to its concentration in the range of 0.05-0.6 μmol/L. The detection limit was 7.6 nmol/L. The method was successfully applied for the determination of 2,4-DCP in fish farm water with satisfactory recoveries. The suggested method has an advantage to be used for water samples due to its short analytical time, rapid response, high sensitivity, and excellent selectivity with good reproducibility. K E Y W O R D S 2,4-dichlorophenol sensor, crosslinked polyaniline/G-MWCNTS nanocomposite, density functional theory, electrochemical properties, thermal properties 1 | INTRODUCTION Conducting polymer (CPs) based sensors have the advantages of the processability of environmental, simplicity, high electrical conductivity, mechanical flexibility as well as low cost 1-2 P.ANI in many applications has appeared as one of the most promising CPs materials. 3-6 PANI composites have been used in the fabrication of diverse devices, such as thermoelectric and energy storage devices, biofuel cells and batteries. 7-16 However, the electrochemical applications are the most promising application of these composites. Particularly, in many electroanalytical studies, the fabrication of PANI and PANI composite electrochemical sensors has become a common way and offers high selectivity as well as sensitivity to detect target molecules. 17-19 Crosslinking may be a candidate to enhance the PANI electrical and

show abstract

“…The reduced state of PAni is related to the conformational changes that occur in the quinoid and benzenoid rings, which are attributed to changes in the 1588 and 1165 cm −1 bands of the oxidized state of PAni, something not shown in Figure 2. In case the PAni is in the protonated state, the Raman spectrum should have a band in the region of 1300 to 1350 cm −1 , which would characterize the quinonic stretch C-N + , which is attributed to the protonated form of the PAni EP, a fact that is not observed in PAni EB film [16][17][18]. With the obtained spectra, it can be stated that the PAni EB present in the binder remains in the oxidized state.…”

Section: Raman Spectroscopymentioning

confidence: 82%

Passivation of Carbon Steel Using Intelligent Epoxy Paint

Silva

Meneguzzi

2020

Coatings

View full text Add to dashboard Cite

This paper presents the production of an epoxy paint associated with a determined concentration of PAni emeraldine base binder, in order to increase dispersion of PAni polymer chains in the paint allow physical contact between PAni chains, the electrolytic medium, and the metal of interest. The coating called Intelligent Epoxy Paint (IEP) seeks to potentialize the electrolytic capacity of PAni to produce passivation, differentiated research which uses PAni in oxidized and conductive form as paint pigment that needs high PAni concentrations. The physicochemical characterization and morphological presented results that indicate the preservation of the desirable properties of PAni in order to make the passivation process possible. The electrochemical tests showed the passivation and/or maintenance of the passivation of the metal of interest, without the need to apply an external current.

show abstract

Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale

Cited by 34 publications

References 42 publications

Enhanced Chemical and Electrochemical Stability of Polyaniline-Based Layer-by-Layer Films

Enhanced Chemical and Electrochemical Stability of Polyaniline-Based Layer-by-Layer Films

Fabrication of conductive cross‐linked polyaniline/G‐MWCNTS core‐shell nanocomposite: A selective sensor for trace determination of chlorophenol in water samples

Passivation of Carbon Steel Using Intelligent Epoxy Paint

Contact Info

Product

Resources

About