The Study of Optical Energy Gap, Refractive Index, and Dielectric Constant of Pure and Doped Polyaniline with HCl and H2SO4  Acids

Baker, Amera G.

doi:10.14500/aro.10483

Cited by 16 publications

(13 citation statements)

References 35 publications

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“…The spectra of f-PANI and HCP-PANI presented broad bands with the maximum at 510 nm, which represents π–π* electronic transitions related to the benzenoid form of PANI and polaron→π* electronic transitions related to the quinoid rings of PANI, respectively [ 35 , 36 ]. The absorption spectra of HCP-SPANI showed peaks around 500–600 nm for sulfonated PANI assigned to π→polaron electronic transitions [ 50 , 51 ]. Figure 4 b–d shows the FT-IR spectra of the fabricated films.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

2022

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We have fabricated poly(ε-caprolactone) (PCL) films with flat and honeycomb-patterned (HCP) structures to coat polyaniline (PANI) on the film surface. In addition, the effect of chemical modification of PANI by sulfuric acid (H2SO4) was also studied for antibacterial activity. The flat and HCP PCL films were obtained by simple evaporation of the solvent and via the breath figure (BF) method, respectively. The morphology and chemical composition of PANI coated on the film surface were evaluated by scanning electron microscopy (SEM) and X-ray spectroscopy (EDX). Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analyses (TGA) were obtained to identify the PANI coating. The wettability and conductivity of the films were also measured. Applicational aspects were evaluated by assessing antibacterial and antibiofilm activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The EDX, TGA, and FT-IR findings indicated chemical modification of PCL film by PANI and H2SO4. The conductivity of the films was increased by the coating of PANI to the patterned surface and additionally increased by the chemically modified PANI. The antibacterial activity was 69.79%, 78.27%, and 88% against E. coli, and 32.73%, 62.65%, and 87.97% against S. aureus, for flat PANI, HCP PANI, and H2SO4-treated HCP films, respectively. Likewise, the PANI coated flat, HCP, and H2SO4-treated HCP films inhibited E. coli biofilm formation by around 41.62%, 63%, and 83.88% and S. aureus biofilm formation by 17.81%, 69.83%, and 96.57%, respectively. The antibacterial activity of the HCP film was higher than that of flat PANI films, probably due to the higher coating of PANI on the HCP surface. Moreover, sulfonation of the HCP film with H2SO4 might have improved the wettability, thereby enhancing the antibacterial and antibiofilm properties. Our results showed that topographical changes, as well as doping, offer simple and cost-effective ways to modify the structural and functional properties of films.

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Section: Resultsmentioning

confidence: 99%

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

2022

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“…Коефіцієнт поглинання (α, см -1 ) визначали зі спектрів оптичного поглинання. Для плівок ПАн, осаджених на ПЕ субстратах, коефіцієнт поглинання розраховували у відповідних довжинах хвиль за допомогою співвідношення Бера-Ламберта (Beer-Lambert's) [38]…”

Section: визначення оптичних параметрів плівок поліанілінуunclassified

“…де l -товщина плівки см; A -поглинання. Розрахункові значення n для плівок ПАн отримано за формулою [23,38] 𝑛 𝑘 .…”

Section: визначення оптичних параметрів плівок поліанілінуunclassified

“…2), що сприяє використанню таких матеріалів у оптичних приладах [62], наприклад, антивідблискових покриттях для сонячних елементів або лінз, відповідно, з високим показником заломлення [8]. Подібні значення показника заломлення ПАн, допованого борною та хлоридною кислотами, а також тенденція зростання значення n зі збільшенням концентрації полімеру описано у [23,38,52].…”

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Energy Band Gap and the Refractive Index for Polyaniline Thin Films of Polyaniline in Thin Films on Polyethylene Surface

Stetsiv¹,

Yatsyshyn²,

Reshetnyak³

2022

Proc. Shevchenko Sci. Soc. Chem. Sci.

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e-mail: yuliia.stetsiv@lnu.edu.ua Polyaniline (PAn) films, doped with citric acid, were synthesized on a polyethylene substrate by chemical oxidative polymerization using ammonium peroxydisulfate as an oxidant. The influence of monomer concentration on the optical properties of PAn films was investigated. Optical band gap, absorption coefficient, extinction coefficient, refractive index were calculated as a function of wavelength. Different methods for determining the energy of the energy gap (Tauc method and absorption spectrum fitting) were considered. It was found that the optical band gap for all thin PAn films is due to the direct allowed optical transitions. It was found that the band gap of PAn films decreases with increasing thickness of deposited PAn films. It is established that the optical energies of the band gap of PAn films of different thickness, estimated by the results of optical absorption measurements using Tauc methods and absorption spectrum fitting, are practically commensurate and are in the range of 3.13–2.36 eV for film thicknesses equal to 18.7–137.4 nm, respectively. Based on the correlations between the optical energy of the band gap and the refractive index of semiconductors using Moss, Ravindra, Ravindra-Gupta, Reddy-Ahammed, Gerve-Vandamme, Kumar-Singh, Annani and Duffy-Reddy ratios, the value of the refractive index of PAn films was calculated and these results were compared with the values obtained from the experimental results. From the obtained results it is seen that the refractive index of PAn films increases with increasing polyaniline film thickness on a polyethylene substrate. The values obtained from the Ravindra and Ravindra-Gupta relations are the closest to the experimental ones. Therefore, the synthesized PE/PAn films can be an available material for the production of optoelectronic devices, for example, for organic field transistors and LEDs.

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“…The nonlinear fitting curve results from a threshold fluence for the used PANI materials of ϕ th = 0.18 ± 0.01 J cm –2 , being in good agreement with the threshold value obtained with the D 2 method (0.17 J ± 0.01 J cm –2 ) . In addition, eq allows obtaining an estimation of 1/ε = 3.85 ± 0.50 μm (at λ = 1030 nm), which is comparable to previous studies of the optical properties of PANI colloidal dispersion (2 μm < 1/ε < 5 μm). , This implies that the estimations for structures height and fluence threshold are both consistent and reliable as similar parameter values were approximated for ϕ th and 1/ε when adjusting eq . However, the slight mismatches obtained in other experimental studies for the calculated 1/ε could have various reasons.…”

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confidence: 99%

Customizable-Width Conducting Polymer Micro/Nanoarrays by Subpicosecond Laser Interference Patterning

Mulko

Heffner

Abel

et al. 2022

ACS Appl. Polym. Mater.

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Direct laser interference patterning (DLIP) employing sub-picosecond IR irradiation allows for the ultrafast processing of polyaniline surfaces polymerized onto a poly(methyl methacrylate) substrate (PANI@PMMA) achieving excellent quality features. The patterning shows high levels of precision regarding control of width and height in micro/nanoarrays, giving customization to the surfaces. The electroactive property evaluation suggests the conductivity presents anisotropic characteristics following the patterning of the polymeric surfaces (R SL = 54 ± 5 kΩ sq −1 and R ST = 1.7 ± 3 MΩ sq −1 , longitudinal and transversal resistance modes respectively). The evidence is supported by electrostatic force microscopy measurements. These results indicate potential applicability in the biomedical field of nerve and myocardial tissue regeneration.

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The Study of Optical Energy Gap, Refractive Index, and Dielectric Constant of Pure and Doped Polyaniline with HCl and H2SO4 Acids

Cited by 16 publications

References 35 publications

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant

Energy Band Gap and the Refractive Index for Polyaniline Thin Films of Polyaniline in Thin Films on Polyethylene Surface

Customizable-Width Conducting Polymer Micro/Nanoarrays by Subpicosecond Laser Interference Patterning

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