Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Majumdar, Dipanwita; Baskey, Moni; Saha, Shyamal Kumar

doi:10.1002/marc.201100292

Cited by 29 publications

(26 citation statements)

References 35 publications

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“…[10][11][12] It has been reported that both nanotubes and graphene accelerate polymer crystallization when they have strong interactions with polymers. [13][14][15][16][17] The resulting interfacial crystals possess different microstructures and morphologies as compared to those in the bulk in terms of polymer chain orientation and crystal polymorphism. Importantly, the ordered interfacial microstructures significantly improve the interfacial adhesion and load transfer.…”

Section: Introductionmentioning

confidence: 99%

Interfacial crystallization of isotactic polypropylene surrounding macroscopic carbon nanotube and graphene fibers

Abdou

Reynolds

Pfau

et al. 2016

Polymer

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A comparative study on interfacial crystallization of isotactic polypropylene (iPP) surrounding macroscopic carbon nanotube and graphene fibers has been carried out in single fiber polymer composites by means of in situ polarized optical microscope, scanning electron microscope and X-ray diffraction. Ordered interfacial microstructures of iPP nucleate on both nanocarbon fibers in the form of a transcrystalline interphase. Nanotube fibers tend to promote negative birefringence transcrystals whereas graphene fibers induce positive birefringence transcrystals. The microstructures of transcrystals are strongly dependent on the thermal history and the double-layered transcrystals consisting of a negative inner layer and a positive outer layer occur under certain conditions. Transcrystallization kinetics has been studied and the Lauritzen-Hoffman theory of heterogeneous nucleation used to analyze the dynamic crystallization process. While the fold surface energy of iPP transcrystals surrounding both nanocarbon fibers shows little difference, the nanotube fiber promotes shorter induction time than the graphene fiber. Thermal resistance test demonstrates that the ordered interfacial microstructures possess higher melting temperature in the nanotube fiber composites than those in the graphene fiber composites. Under appropriate conditions, the-form transcrystals of iPP are observed. The amount of the-form iPP surrounding the nanotube fiber is much higher than that surrounding the graphene fiber. A theoretical model is proposed to interpret the difference between the nanotube and graphene fiber composites and the mechanisms behind its influence on interfacial crystallization.

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Section: Introductionmentioning

confidence: 99%

Interfacial crystallization of isotactic polypropylene surrounding macroscopic carbon nanotube and graphene fibers

Abdou

Reynolds

Pfau

et al. 2016

Polymer

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“…The crystalline PANI peaks in EBP‐PANI are induced, since the epoxide groups in EBP may be involved in PANI formation as oxidants. In this regard, according to the paper published by Majumdar et al ., anilinium ions can be arranged along the epoxide group arrays, in a head‐to‐tail fashion, with their benzene rings perpendicular to the surface of the graphene oxide. Then, the portion of epoxide rings can be strained and uniformly disassembled.…”

Section: Resultsmentioning

confidence: 99%

“…Unlike previous reported method to attach epoxide functional groups via a zwitterionic method, the carbon nanotubes were functionalized by acid treatment (meta‐chloroperoxybenzoic acid [m‐CPBA]) to directly introduce epoxide functional groups on their surfaces. The electrochemical performances of the hybrid supercapacitor prepared in this article were analyzed, based on the three following hypotheses: (1) epoxide groups on functionalized carbon nanotubes will act as oxidants when aniline is polymerized, resulting in crystalline PANI exhibiting high conductivity; (2) hydrogen bonds can be formed between epoxide groups on the functionalized carbon nanotubes and amine in PANI, leading to improved binding forces in the composite; and (3) chemical interactions arise between AgNPs and nitrogen atoms in PANI, which provide high conductivity and improve the specific capacitance . All these factors can lead to a device with improved electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

AgNP/crystalline PANI/EBP‐composite‐based supercapacitor electrode with internal chemical interactions

Kim

Manivannan

Balakumar

et al. 2019

J of Applied Polymer Sci

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In this article, polyaniline (PANI) was conformally coated on epoxide‐functionalized buckypaper (EBP). Because of the presence of epoxide functional groups, chemical interactions occurred between oxygen in the epoxide groups and NH in the PANI. These chemical interactions were identified by peak shifts and intensity changes in Raman spectra. Additionally, crystalline peaks were clearly observed through X‐ray diffraction. However, Raman peak changes or crystalline peaks were not observed in nonfunctionalized buckypaper (purified pristine buckypaper [PPBP])‐based composites. Both hydrogen bonding and crystalline nature of EBP‐PANI enhanced its electrical conductivity, producing a specific capacitance better than that of PPBP‐PANI. Finally, Ag nanoparticles (AgNPs) were applied to EBP‐PANI to further enhance its electrical conductivity. Owing to the presence of AgNPs and their interactions with the N in PANI, the specific capacitance of EBP‐PANI‐AgNP reached 915.62 F/g. These results emphasize the positive effect of chemical interactions and crystalline nature of EBP‐based composites on their electrochemical performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48164.

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“…4. The diffractogram of PANI exhibits a semi-crystalline peak at 26° which is the major distinctive peak of PANI [22]. The broad peak of PANI is superimposed by the diffraction peak of Gr and a highly pronounced peak of PANI doped Gr is observed at 27° in the 15 wt% composite diffractogram whose height increases proportionally to the weight percentage of Gr in the polymer matrix.…”

Section: Xrd Analysismentioning

confidence: 97%

Synthesis, characterization and Hall-effect studies of highly conductive polyaniline/graphene nanocomposites

Rajyalakshmi

Pasha²,

Khasim

et al. 2020

SN Appl. Sci.

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The objective of this research is to prepare a series of conducting polyaniline/graphene composites by in situ chemical oxidative method through polymerization of aniline in the existence of graphene of various weight percentages. The prepared composites were examined through Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy respectively. The conductivity and dielectric attributes exhibited composition dependent percolation behavior with enhanced properties for 15 wt% of graphene in polyaniline matrix. The Hall-effect studies were performed in the prepared composites and the investigations confirm that the composites behave as n-type semiconductors. From the data obtained one can envisage remarkable improvement in the charge transport and dielectric properties of the composite at the percolation threshold due to the presence of nano-size additive in the composite. The temperature dependent conductivity in doped composites was increased by five fold in compare to pure PANI. The doping of graphene in PANI matrix, the improved dielectric parameters were achieved. The Hall effect studies were carried out in the prepared composites, the results shows that composites behaves like a n-type semiconductor. Further, the mechanical properties such as tensile stress and tensile strain were carried out in the prepared composites.

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Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Cited by 29 publications

References 35 publications

Interfacial crystallization of isotactic polypropylene surrounding macroscopic carbon nanotube and graphene fibers

Interfacial crystallization of isotactic polypropylene surrounding macroscopic carbon nanotube and graphene fibers

AgNP/crystalline PANI/EBP‐composite‐based supercapacitor electrode with internal chemical interactions

Synthesis, characterization and Hall-effect studies of highly conductive polyaniline/graphene nanocomposites

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