scholarly journals Graphene Deposition on Glass Fibers by Triboelectrification

2021 ◽  
Vol 11 (7) ◽  
pp. 3123
Author(s):  
Haroon Mahmood ◽  
Laura Simonini ◽  
Andrea Dorigato ◽  
Alessandro Pegoretti
Keyword(s):  
Graphene Oxide ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Deposition Process ◽  
Solution Concentration ◽  
Dip Coating ◽  
Slight Improvement ◽  
Reduced Graphene ◽  
Fiber Matrix ◽  
Positively Charged

In this work, a novel nanomaterial deposition technique involving the triboelectrification (TE) of glass fibers (GF) to create attractive charges on their surface was investigated. Through TE, continuous GF were positively charged thus, attracting negatively charged graphene oxide (GO) nanoparticles dispersed in a solution. The electrical charges on the glass fibers surface increased with the intensity of the TE process. The deposited GO coating was then chemically treated to obtain reduced graphene oxide (rGO) on the surface of GFs. The amount of coating obtained increased with the GO solution concentration used during the deposition process, as revealed by FESEM analysis. However, the same increment could not be noticed as a function of the intensity of the process. Both uncoated and coated GF were used to obtain single fiber microcomposites by using a bicomponent epoxy matrix. The fiber/matrix interfacial shear strength was evaluated through micro debonding tests, which revealed an increment of fiber/matrix adhesion up to 45% for rGO coated GF in comparison to the uncoated ones. A slight improvement in the electrical conductivity of rGO coated fibers through TE compared to conventional dip coating was also observed in terms of volumetric resistivity by a four-point probe setup.

NiO Nanocrystalline/Reduced Graphene Oxide Composite Film with Enhanced Electrochromic Properties

NANO ◽  
2017 ◽  
Vol 12 (05) ◽  
pp. 1750058 ◽  
Author(s):  
Fengpei Lang ◽  
Jingbing Liu ◽  
Hao Wang ◽  
Hui Yan
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Cycling Performance ◽  
Dip Coating ◽  
Switching Speed ◽  
Electrochromic Properties ◽  
Reduced Graphene ◽  
Coating Method ◽  
Dip Coating Method

The NiO nanocrystalline/reduced graphene oxide (rGO) composite film was successfully synthesized using a simple hot-injection and dip coating method. The as-prepared samples were characterized using X-ray diffraction (XRD), Raman, scanning electron microscope (SEM), ultraviolet and visible spectrophotometer (UV). Compared to the NiO film, the NiO nanocrystalline/rGO composite film exhibits enhanced electrochromic properties and large [Formula: see text] (40.7% at 550[Formula: see text]nm), fast switching speed ([Formula: see text].3[Formula: see text]s and [Formula: see text].9[Formula: see text]s), high coloration efficiency (12.85[Formula: see text]cm2 C[Formula: see text] and better cycling performance (1000 cycles). The improvement of the electrochromic properties was attributed to the large specific surface area and good conductivity of the rGO.

scholarly journals The preparation and research of reduced graphene oxide/glass composite fiber

2019 ◽  
Vol 14 ◽  
pp. 155892501988310
Author(s):  
Shun Li ◽  
Zhaofeng Chen ◽  
Zhiyuan Rao ◽  
Fei Wang ◽  
Cao Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glass Fibers ◽  
Composite Fiber ◽  
Oxide Glass ◽  
Oxide Content ◽  
Glass Composite ◽  
Ultrasonic Dispersion ◽  
X Ray ◽  
Reduced Graphene

In this article, reduced graphene oxide/glass composite fiber was prepared from mixing graphene oxide and glass powder by ultrasonic dispersion, planetary grinding, high-temperature sintering, and melting wire drawing. The effects of reduced graphene oxide content on the mechanical and electrical properties of the fiber were investigated. Thermal gravimetric analyzer, differential scanning calorimeter, x-ray diffraction, and energy-dispersive x-ray spectroscopy analysis revealed that the graphene oxide was reduced to reduced graphene oxide in the sintering process and the performances of the composite fiber were improved. The tensile strength of reduced graphene oxide/glass composite fiber was 20% higher than the pristine glass fibers by the addition of 0.5 wt% of reduced graphene oxide. Reduced graphene oxide content was positively correlated with composites conductivity, and according to the percolation theory, the percolation threshold of reduced graphene oxide/glass composite fiber was about 0.5 wt%, and the conductivity of the composite fibers was increased by four orders of magnitude compared to the pristine glass fibers when the content of reduced graphene oxide was 0.5 wt%.

scholarly journals Enhancing the Linearity and Stability of a Fabric-Based Strain Sensor with Microfolded Graphene Structures

2020 ◽  
Vol 10 (18) ◽  
pp. 6230
Author(s):  
Rongqing Xu ◽  
Xin Zheng ◽  
Miao Chen ◽  
Lijun Sun ◽  
Jiangwei Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Multiwall Carbon Nanotubes ◽  
Strain Sensor ◽  
Dip Coating ◽  
Physiological Signals ◽  
Large Strains ◽  
Practical Applications ◽  
Good Linearity ◽  
Reduced Graphene

Fabric-based strain sensors can be seamlessly integrated into wearable systems for monitoring various physiological signals. Although many different approaches have been proposed to increase the sensitivity of the fabric-based strain sensor, the linearity and stability in large strains are still challenging. In this paper, a fabric-based strain sensor with good linearity and stability was fabricated via a three-step dip-coating method. Specifically, the combination of multiwall carbon nanotubes and reduced graphene oxide was used as the conductive material to enhance the stability. Meanwhile, microfolded structures between two reduced graphene oxide layers were created via pre-stretching to achieve good linearity. Through mechanical experiments, the performance of the fabric-based strain sensor was characterized. In addition, the practical applications of the strain sensor were demonstrated by monitoring different physiological signals.

scholarly journals Temperature Dependent Strain/Damage Monitoring of Glass/Epoxy Composites with Graphene as a Piezoresistive Interphase

Fibers ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 17 ◽  
Author(s):  
Haroon Mahmood ◽  
Andrea Dorigato ◽  
Alessandro Pegoretti
Keyword(s):  
Graphene Oxide ◽  
Composite Laminates ◽  
Mechanical Performance ◽  
Loss Modulus ◽  
Glass Fibers ◽  
Negative Temperature ◽  
Deposition Process ◽  
Fiber Reinforced Polymer Composites ◽  
Damage Monitoring ◽  
Interlaminar Shear

Graphene as an interphase not only improves the mechanical performance of fiber reinforced polymer composites but also induces functional properties like electrical conductivity, thus providing the possibility of strain monitoring in real time. At this aim, graphene oxide (GO) was electrophoretically deposited at different applied potentials on glass fibers to create a uniform coating and was subsequently chemically reduced to obtain a conductive layer of reduced graphene oxide (rGO). After the optimization of the deposition process, composite laminates were prepared by hand lay-up with an epoxy resin, followed by curing in vacuum bag. The deposited rGO interphase improved the dynamic moduli (storage and loss modulus), the flexural strength (+23%), and interlaminar shear strength (ILSS) (+29%) of the composites. Moreover, laminates reinforced with rGO-coated glass fibers showed an electrical resistivity in the order of ~101 Ω·m, with a negative temperature coefficient. The piezoresistivity of the composites was monitored under flexural loading under isothermal conditions, and strain/damage monitoring was evaluated at different temperatures through the change of the electrical resistance with the applied strain.

scholarly journals Polymeric Coatings for AR-Glass Fibers in Cement-Based Matrices: Effect of Nanoclay on the Fiber-Matrix Interaction

2021 ◽  
Vol 11 (12) ◽  
pp. 5484
Author(s):  
Francesca Bompadre ◽  
Christina Scheffler ◽  
Toni Utech ◽  
Jacopo Donnini
Keyword(s):  
Contact Zone ◽  
Glass Fibers ◽  
Stress Transfer ◽  
Dip Coating ◽  
Organic Coating ◽  
Polymeric Coatings ◽  
X Ray ◽  
Pull Out ◽  
Fiber Matrix ◽  
Coating Formulation

Polymeric coatings are widely used to enhance the load bearing capacity and chemical durability of alkali-resistant glass (AR-glass) textile in cement-based composites. The contact zone between coated yarns and concrete matrix plays a major role to enable the stress transfer and has still to be improved for the full exploitation of the mechanical behavior of the composite. As a new approach, this paper studies how the addition of nanoclay particles in the polymer coating formulation can increase the chemical bond between organic coating and inorganic matrix. This includes the description of the water-based coating preparation by dispersing sodium montmorillonites, whereby the resulting coating nanostructure is characterized by X-ray diffraction and energy dispersive X-ray spectroscopy. Single glass fibers were treated by dip-coating. Atomic force microscopy was used to determine the surface roughness, and the effect on the fiber tensile properties was studied. Moreover, the morphological and chemical characteristics of the coatings were compared with the results obtained from single fiber pull-out (SFPO) tests. It was shown that the incorporation of nanoclays leads to increased interfacial shear strength arising from the ability of nanoclay particles to nucleate hydration products in the fiber-matrix contact zone.

scholarly journals Application of AgNPs/rGO Modified Nylon Fabric in Strain Sensing

2021 ◽  
Vol 2109 (1) ◽  
pp. 012017
Author(s):  
Yongqiang Yang ◽  
Yongsong Tan ◽  
Qun Wang ◽  
Yihu Shu ◽  
Qinsheng Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Screen Printing ◽  
Strain Sensor ◽  
Solution Concentration ◽  
Ammonia Solution ◽  
Strain Sensing ◽  
Nylon Fabric ◽  
Reduced Graphene ◽  
Different Strains

Abstract The graphene oxide slurry was printed on the pre-stretched and non-pre-stretched nylon fabric by screen printing, and immersed in silver ammonia solution of different concentrations, and then reduced to obtain silver nanoparticles/reduced graphene oxide (AgNPs/rGO) modified nylon fabric with excellent conductivity. The surface morphology of the fabric was observed, and the performances of the fabric sensor that was scraped with graphene oxide slurry between the pre-stretched and non-pre-stretched states were explored. The resistance responses of the nylon fabric finished with different concentrations of silver ammonia solution under different strains (1%, 2%, 3%, 4%, 5%, 10%, 15%, 20%) were investigated. The results showed that the nylon strain sensor was more sensitive and stable when the graphene oxide slurry was scraped in the pre-stretched state, and while the silver ammonia solution concentration was 10 mg/mL, the nylon fabric had maximum sensitivity and lowest hysteresis performance.

Green Reduction of Graphene Oxide Coated Polyamide Fabric Using Carob Extract

2020 ◽  
Vol 7 (6) ◽  
pp. 33-40
Author(s):  
Nergis Gültekin ◽  
İsmail Usta ◽  
Bahattin Yalçin
Keyword(s):  
Graphene Oxide ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Reduced Graphene ◽  
Structure Morphology ◽  
Coating Method ◽  
Polyamide Fabric ◽  
Dip Coating Method

A green reduction processes for graphene oxide using carob extract is reported in this work. In this study, graphene oxide (GO) nanosheets were synthesized using the improved Hummer's method and applied to polyamide fabric thorough the simple dip coating method. Then, the graphene oxide was reduced with a chemical reduction process using carob extract as a green reducing agent to give the reduced graphene oxide (RGO) material. The reduction time was studied. The structure, morphology, and thermal behavior of the material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), respectively. The electrical resistivity results clearly revealed that the GO coated polyamide fabric was successfully converted to the RGO coated polyamide fabric with the effective elimination of oxygen containing functional groups.

scholarly journals Highly stretchable, mechanically stable, and weavable reduced graphene oxide yarn with high NO2 sensitivity for wearable gas sensors

RSC Advances ◽  
2018 ◽  
Vol 8 (14) ◽  
pp. 7615-7621 ◽  
Author(s):  
Yong Ju Yun ◽  
Do Yeob Kim ◽  
Won G. Hong ◽  
Dong Han Ha ◽  
Yongseok Jun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensors ◽  
Dip Coating ◽  
Reduced Graphene ◽  
Highly Stretchable

Highly stretchable, mechanically stable and weavable RGO elastic electronic yarns were developed using dip-coating with pre-straining. We demonstrate wearable gas sensors that can be worn on the wrist.

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