Thermal stability and dielectric relaxation behavior of in situ prepared poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composites

Wadhwa, Heena; Kandhol, Geeta; Deshpande, Uday; Mahendia, Suman; Kumar, S.

doi:10.1007/s00396-020-04718-0

Cited by 29 publications

(10 citation statements)

References 77 publications

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“…Thus, one proposed explanation for the reduced relaxation time was that due to the enhancement of carrier mobility contributed by π−π interaction, the increase in carrier mobility could reduce the transition resistance of electrons, reducing the τ. 43,44 However, as the results in Table 3 show, we calculated that the τ of rGO@PANI was smaller than the matrix, and the relaxation phenomenon should be reduced as the loading content increased, which is inconsistent with our study. Thus, the idea that the improved carrier mobility could reduce the relaxation time is true, and there should be another mechanism that cooperated with the improved carrier mobility to achieve this effect.…”

Section: Resultscontrasting

confidence: 99%

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Liu

Wang

Peng

et al. 2022

ACS Appl. Nano Mater.

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To meet the demand of emerging devices for highfrequency dielectric performances, we proposed semiconductor polyaniline in situ modified rGO nanosheets to keep the dielectric constant stable at high frequencies. The π−π interface interaction between rGO and semiconductor polyaniline was found to block the migration of electrons, redistributing the delocalized electrons of rGO and leading to a reduction in relaxation time and a delay in the dielectric relaxation at higher frequencies. This mechanism gave the dielectric materials a stable dielectric constant at high frequencies. The dielectric relaxation time was reduced from 2.75 × 10 −8 to 5.68 × 10 −10 at a filler load of 10 wt %. The dielectric constant only decreased by 19% from 100 to 1 × 10 8 Hz. For the same range, unmodified rGO showed an 85% decrease. This mechanism could also further increase the dielectric constant and decrease the dielectric loss. This has a great potential for emerging high-frequency devices (DC/DC converter, sensors, energy harvesters, etc.).

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Section: Resultscontrasting

confidence: 99%

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Liu

Wang

Peng

et al. 2022

ACS Appl. Nano Mater.

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“…Defining the GO structure, the ratio of ID/IG = 1.03 indicates the high reduction degree of GO. Reduced graphene oxide (rGO) differs due to its higher conductivity and sp 2 cluster organization, which is important to consider for the electrospinning process [ 36 , 37 ]. The ratios of ID/IG = 1.07 for PVA-GO and ID/IG = 1.14 for core–shell fibers were compared with ID/IG = 1.03 for pristine GO, where the higher level of interaction formed in the electrospun fibers caused a gradual increase in ID/IG [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogel-Inducing Graphene-Oxide-Derived Core–Shell Fiber Composite for Antibacterial Wound Dressing

Kan

Bondareva

Statnik

et al. 2023

IJMS

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The study reveals the polymer–crosslinker interactions and functionality of hydrophilic nanofibers for antibacterial wound coatings. Coaxial electrospinning leverages a drug encapsulation protocol for a core–shell fiber composite with a core derived from polyvinyl alcohol and polyethylene glycol with amorphous silica (PVA-PEG-SiO2), and a shell originating from polyvinyl alcohol and graphene oxide (PVA-GO). Crosslinking with GO and SiO2 initiates the hydrogel transition for the fiber composite upon contact with moisture, which aims to optimize the drug release. The effect of hydrogel-inducing additives on the drug kinetics is evaluated in the case of chlorhexidine digluconate (CHX) encapsulation in the core of core–shell fiber composite PVA-PEG-SiO2-1x-CHX@PVA-GO. The release rate is assessed with the zero, first-order, Higuchi, and Korsmeyer–Peppas kinetic models, where the inclusion of crosslinking silica provides a longer degradation and release rate. CHX medicated core–shell composite provides sustainable antibacterial activity against Staphylococcus aureus.

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“…Whereas, the increase in oscillating frequency will eliminate contributed ionic and space charge as well as cause a systematic drop in the dielectric response [13]. Thus, the GO filling inside the PVA polymer matrix achieved high dielectric SC caused by Maxwell-Wagner-Sillar theory [11]. The phase angle in Figure 2(b) is an indication of the leakage current through GO/PVA spacers.…”

Section: The Mega Dielectric Value Of Doublementioning

confidence: 99%

“…Thus, nano-composites doped inside a polymer matrix is a promising candidate for promoting dielectric characteristics for wearable and flexible electronics [5]. Among enormous compositions types, RGO and GO are blinded in polymer to expand the dielectric response via two different technique, the first is by forming multiple micro-capacitors inside the spacer while the other is using the oxide function group strong polarization [11]. The present section is revealing the potential of using graphene-based polymer composite potential as a super dielectric spacer for RF SC applications [12].…”

Section: Dielectric Supercapacitor Of Pseudo 2d Gomentioning

confidence: 99%

Graphene Functionalization towards Developing Superior Supercapacitors Performance

Elhamid¹,

Shawkey²,

Khalil³

et al. 2022

Supercapacitors for the Next Generation

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Graphene is known as the miracle material of the 21st century for the wide band of participating applications and epic properties. Unlike the CVD monolayer graphene, Reduced graphene oxide (RGO) is a commercial form with mass production accessibility via numerous numbers of methods in preparation and reduction terms. Such RGO form showed exceptional combability in supercapacitors (SCs) where RGO is participated to promote flexibility, lifetime and performance. The chapter will illustrate 4 critical milestones of using graphene derivatives for achieving SC’s superior performance. The first is using oxidized graphene (GO) blind with polymer for super dielectric spacer. The other three types are dealing with electrolytic SCs based on RGO. Polyaniline (PANI) was grown on GO for exceptionally stable SCs of 100% retention. Silver decoration of RGO was used for all-solid-state printable device. The solid-state gel electrolyte was developed by adding GO to promote current rating. Finally, laser reduced graphene is presented as a one-step and versatile technique for micropatterning processing. The RGO reduction was demonstrated from a laser GO interaction perspective according to two selected key parameters; wavelength and pulse duration.

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Thermal stability and dielectric relaxation behavior of in situ prepared poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composites

Cited by 29 publications

References 77 publications

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Hydrogel-Inducing Graphene-Oxide-Derived Core–Shell Fiber Composite for Antibacterial Wound Dressing

Graphene Functionalization towards Developing Superior Supercapacitors Performance

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