Enhanced Field Emission from Reduced Graphene Oxide Polymer Composites

Viskadouros, George; Stylianakis, Minas M.; Kymakis, Emmanuel; Stratakis, Emmanuel

doi:10.1021/am4044618

Cited by 47 publications

(30 citation statements)

References 50 publications

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“…In addition, the experimental results suggested a dependence of electric potential on the density of the PVDF-GO fibers. The obtained results are in accordance with the data declared in some recent works of other authors [31,32].…”

Section: Discussionsupporting

confidence: 93%

Preparation, Stability and Local Piezoelectrical Properties of P(VDF-TrFE)/Graphene Oxide Composite Fibers

Silibin

Karpinsky

Bystrov

et al. 2019

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The unprecedented attributes such as biocompatibility and flexibility of macromolecular piezoelectric polymer has triggered an immense interested in scientific society for their potential exploitation in implantable electronic devices. In the present article, a theoretical and experimental investigation is done to explore the polarization behavior of composite fibers based on copolymer poly-trifluoroethylene P(VDF-TrFE) and graphene oxide (GO) with varying composition of the components is explored for its possible application in bioelectronic devices. Electromechanical properties of the PVDF/GO nanofibers were investigated using piezoresponse force microscopy (PFM) method. The switching behavior, charge states, and piezoelectric response of the fibers were found to depend on the concentration of GO up to 20%. Theoretical models of PVDF chains, interacting with Graphene/GO layers has been used to explore the evolution of piezoresponse in the composite fibers. In order to compute piezoelectric coefficients, the behavior of composite in electrical fields has been modeled using software HyperChem. The experimental results are qualitatively correlated with a computed theoretical model.

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Section: Discussionsupporting

confidence: 93%

Preparation, Stability and Local Piezoelectrical Properties of P(VDF-TrFE)/Graphene Oxide Composite Fibers

Silibin

Karpinsky

Bystrov

et al. 2019

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“…Details are given in a previous work of our group [19]. For the preparation of stable aqueous suspensions highly enriched in monolayer GO sheets, a certain quantity of GO was exfoliated by bath sonication for a period of one hour.…”

Section: Preparation Of the Starting Go Solutionmentioning

confidence: 99%

Effect of the reduction process on the field emission performance of reduced graphene oxide cathodes

et al. 2015

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The electron field emission (FE) properties of reduced graphene oxide (rGO) cathodes produced by three different reduction methods were assessed and compared. In particular, chemical reduction techniques, using either NaOH or KOH as reducing agent, were compared with thermal reduction (TR) methods. X-ray photoelectron spectroscopy (XPS) measurements revealed that different reduction techniques led to different GO lattice parameters. Furthermore, the work function measured with ultraviolet photoelectron spectroscopy (UPS) varied among the 2 samples giving rise to different electron emission characteristics. In particular, the cathodes prepared by the TR method presented the best FE performance, showing a turn-on field of as low as ~1.8 V/µm and a field enhancement factor of ~1300, which was very close however to that shown by the NaOH-reduced sheets. The worst FE properties was exhibited by the KOH-reduced nanosheets. In view of the above results, the role of the different reduction techniques as well as the final rGO lattice characteristics with regards to the emission performance are evaluated and discussed.

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“…[20][21][22] Within the graphene-based materials (GBMs) family, reduced graphene oxide (RGO) stands out for its good electronic properties, processability, low-costs, possibility to use green-chemistry methods for its production, and suitability for largescale applications. [23][24][25][26][27] Composites of pristine RGO with regioregular poly(3-hexylthiophene) (P3HT), the benchmark solution-processable polythiophene species, have been employed to enhance performance in a polymermetal oxide hybrid solar cell, [28] to produce FETs with good hole mobility, [11] to boost efficiency and stability in perovskite solar cells (PSCs), [29,30] and as active materials in field emission cathodes [31] and gas sensors. [32] In principle, RGO and P3HT have the potential to establish π-π stacking interactions between their individual delocalized π electrons clouds, [33] which can make their composites highly stable and not subjected to phase separation.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Morphology Addresses Performance of Perovskite Solar Cells Based on Composite Hole Transporting Materials of Functionalized Reduced Graphene Oxide and P3HT

et al. 2018

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The development of novel hole transporting materials (HTMs) for perovskite solar cells (PSCs) that can enhance device's reproducibility is a largely pursued goal, even to the detriment of a very high efficiency, since it paves the way to an effective industrialization of this technology. In this work, we study the covalent functionalization of reduced graphene oxide (RGO) flakes with different organic functional groups with the aim of increasing the stability and homogeneity of their dispersion within a poly(3‐hexylthiophene) (P3HT) HTM. The selected functional groups are indeed those recalling the two characteristic moieties present in P3HT, i.e., the thienyl and alkyl residues. After preparation and characterization of a number of functionalized RGO@P3HT blends, we test the two containing the highest percentage of dispersed RGO as HTMs in PSCs and compare their performance with that of pristine P3HT and of the standard Spiro‐OMeTAD HTM. Results reveal the big influence of the morphology adopted by the single RGO flakes contained in the composite HTM in driving the final device performance and allow to distinguish one of these blends as a promising material for the fabrication of highly reproducible PSCs.

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Enhanced Field Emission from Reduced Graphene Oxide Polymer Composites

Cited by 47 publications

References 50 publications

Preparation, Stability and Local Piezoelectrical Properties of P(VDF-TrFE)/Graphene Oxide Composite Fibers

Preparation, Stability and Local Piezoelectrical Properties of P(VDF-TrFE)/Graphene Oxide Composite Fibers

Effect of the reduction process on the field emission performance of reduced graphene oxide cathodes

Interfacial Morphology Addresses Performance of Perovskite Solar Cells Based on Composite Hole Transporting Materials of Functionalized Reduced Graphene Oxide and P3HT

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