Self-supported bacterial cellulose polyaniline conducting membrane as electromagnetic interference shielding material: effect of the oxidizing agent

Marins, Jéssica Alves; Soares, Bluma G.; Fraga, Mayra; Müller, Daliana; Barra, Guilherme Mariz de Oliveira

doi:10.1007/s10570-014-0191-9

Cited by 60 publications

(38 citation statements)

References 35 publications

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“…Bacterial cellulose (BC) is a bioproduct prepared by fermentation of bacterial, consisting of an ultrafine 3D fibrous network structure composed of nanofibrils with 10–100 nm diameters. The structure offers many attractive properties, such as low cost, renewability, and porous nature; it represents a desirable material for use in energy conversion and storage. Yu and co‐workers fabricated various composites using BC as template material .…”

Section: Introductionmentioning

confidence: 99%

Superior Sodium Storage in 3D Interconnected Nitrogen and Oxygen Dual‐Doped Carbon Network

Wang

Yang

et al. 2016

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Carbonaceous materials have attracted immense interest as anode materials for Na-ion batteries (NIBs) because of their good chemical, thermal stabilities, as well as high Na-storage capacity. However, the carbonaceous materials as anodes for NIBs still suffer from the lower rate capability and poor cycle life. An N,O-dual doped carbon (denoted as NOC) network is designed and synthesized, which is greatly favorable for sodium storage. It exhibits high specific capacity and ultralong cycling stability, delivering a capacity of 545 mAh g(-1) at 100 mA g(-1) after 100 cycles and retaining a capacity of 240 mAh g(-1) at 2 A g(-1) after 2000 cycles. The NOC composite with 3D well-defined porosity and N,O-dual doped induces active sites, contributing to the enhanced sodium storage. In addition, the NOC is synthesized through a facile solution process, which can be easily extended to the preparation of many other N,O-dual doped carbonaceous materials for wide applications in catalysis, energy storage, and solar cells.

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Section: Introductionmentioning

confidence: 99%

Superior Sodium Storage in 3D Interconnected Nitrogen and Oxygen Dual‐Doped Carbon Network

Wang

Yang

et al. 2016

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158

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“…Figure shows the EMI SE of the pure PU, PU/PPF–PPy composites as a function of conductive filler content in the frequency range from 8 to 12.4 GHz. The EMI SE of PU/PPF–PPy composites increase with increasing the PPF–PPy content, due to the formation of a conducting pathways into PU matrix . Composites containing 25 wt% of PPF–PPy displays an electromagnetic attenuation of −12.0 dB over all frequency ranges studied which corresponds to 93.2% of attenuation.…”

Section: Resultsmentioning

confidence: 96%

“…The absorption power ( A ) is then determined by:

A = 1 - R - T

where R is the reflection power obtaining from the S 11 ( S 22 ) scattering parameter, and T is the transmission power obtaining from the S 21 ( S 12 ) scattering parameter .…”

Section: Resultsmentioning

confidence: 99%

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Electrically conductive composites of polyurethane derived from castor oil with polypyrrole‐coated peach palm fibers

et al. 2015

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Electrically conducting fibers were prepared through in situ oxidative polymerization of pyrrole (Py) in the presence of peach palm fibers (PPF) using iron (III) chloride hexahydrate (FeCl 3. 6H 2 O) as oxidant. The polypyrrole (PPy) coated PPF displayed a PPy layer on the fibers surface, which was responsible for an electrical conductivity of (2.2 6 0.3) 3 10 21 S cm 21 , similar to the neat PPy. Electrically conductive composites were prepared by dispersing various amounts of PPy-coated PPF in a polyurethane matrix derived from castor oil. The polyurethane/PPy-coated PPF composites (PU/ PPF-PPy) exhibited an electrical conductivity higher than PU/PPy blends with similar filler content. This behavior is attributed to the higher aspect ratio of PPF-PPy when compared with PPy particles, inducing a denser conductive network formation in the PU matrix. Electromagnetic interference shielding effectiveness (EMI SE) value in the X-band (8.2-12.4 GHz) found for PU/PPF-PPy composites containing 25 wt% of PPF-PPy were in the range 212 dB, which corresponds to 93.2% of attenuation, indicating that these composites are promising candidates for EMI shielding applications. POLYM. COMPOS., 00:000-000, 2015.

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“…It is possible to observe a semicircular region at high frequencies, which is related to an interfacial charge transfer process and a linear region at low frequencies, corresponding to diffusion processes. 51,[53][54][55] Marins et al 56 fabricated bacterial cellulose films and PANI doped with dodecylbenzene sulfonic acid and found only a semicircle in the Nyquist plots, which, according to the authors, is an expected feature for materials with only one phase. This fact corroborates with the morphological analysis, indicating a good dispersion of PANI throughout the film.…”

Section: Eismentioning

confidence: 94%

Cellulose Nanofibrils Modification With Polyaniline Aiming at Enhancing Electrical Properties for Application in Flexible Electronics

Silva¹,

Claro²,

Sanfelice³

et al. 2019

Cellulose Chem. Technol.

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This work aims to produce, characterize and compare the properties of composite films of cellulose nanofibrils (CNF) and polyaniline (PANI) doped with two distinct acids. CNF were produced by mechanical fibrillation and combined with PANI via in situ polymerization. The results revealed that PANI presented successful polymerization and homogenous dispersion throughout the films with no distinctive separation from cellulose. The films containing PANI doped with HCl 1M and 2M presented significantly higher values in comparison with the films produced with only CNF. The charge transfer resistance evaluated by impedance spectroscopy for the films with PANI was lower than for the CNF films, indicating an improvement in electrical conduction, which in turn helped increasing charge storage. Even though the films of PANI doped with citric acid showed lower values compared to those of the films doped with HCl, citric acid is a suitable and greener dopant and therefore, it is worth being further investigated for conducting thin films containing cellulose for application in green electronics.

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Self-supported bacterial cellulose polyaniline conducting membrane as electromagnetic interference shielding material: effect of the oxidizing agent

Cited by 60 publications

References 35 publications

Superior Sodium Storage in 3D Interconnected Nitrogen and Oxygen Dual‐Doped Carbon Network

Superior Sodium Storage in 3D Interconnected Nitrogen and Oxygen Dual‐Doped Carbon Network

Electrically conductive composites of polyurethane derived from castor oil with polypyrrole‐coated peach palm fibers

Cellulose Nanofibrils Modification With Polyaniline Aiming at Enhancing Electrical Properties for Application in Flexible Electronics

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