scholarly journals Reduction of Graphene Oxide by Laser Scribing in Different Atmospheres and Application in Humidity Sensing

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Vittorio Scardaci ◽  
Luca Fichera ◽  
Maria E. Fragalà ◽  
Nunzio Tuccitto ◽  
Giovanni Marletta ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Chemical Composition ◽  
Electrical Properties ◽  
Oxide Materials ◽  
Humidity Sensing ◽  
Controlled Atmospheres ◽  
Laser Scribing ◽  
Cw Laser ◽  
Reduced Graphene ◽  
Order Degree

Laser scribing, by far proposed as a method for efficiently transforming graphene oxide into reduced graphene, has been employed, using a CW laser beam, to study the modifications of graphene oxide scribed under different controlled atmospheres, including air, N2, Ar, and a 95 : 5 (v/v) Ar/H2 mixture. We have found that laser scribing effects, including chemical composition, order degree, and electrical properties, strongly depend upon the atmosphere during the irradiation. The electrical properties of the various materials, obtained in different atmospheres, have been evaluated with respect to the sensing properties towards humidity, the materials produced in pure Argon yielding the highest sensitivity and the fastest response, while related Raman microspectroscopy measurements showed that both Ar and Ar-H2 mixture produce the highest order among the various samples. The results stress the importance and the potentialities of controlling the irradiation atmosphere in order to tune the composition and electrical properties of the laser-scribed graphene oxide materials.

Elastomer based nanocomposites with reduced graphene oxide nanofillers allow for enhanced tensile and electrical properties

2020 ◽  
Vol 27 (5) ◽  
Author(s):  
Sumaira Mazhar ◽  
Bret P. Lawson ◽  
Barry D. Stein ◽  
Maren Pink ◽  
John Carini ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene

scholarly journals Investigation of Graphene Derivatives on Electrical Properties of Alkali Activated Slag Composites

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4374
Author(s):  
Wu-Jian Long ◽  
Xuanhan Zhang ◽  
Biqin Dong ◽  
Yuan Fang ◽  
Tao-Hua Ye ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Mechanical Performance ◽  
Structural Defects ◽  
Alkali Activated Slag ◽  
Mechanical And Electrical Properties ◽  
Reduced Graphene ◽  
Graphene Derivatives ◽  
Activated Slag ◽  
Alkali Activated

Reduced graphene oxide (rGO) has been widely used to modify the mechanical performance of alkali activated slag composites (AASC); however, the mechanism is still unclear and the electrical properties of rGO reinforced AASC are unknown. Here, the rheological, mechanical, and electrical properties of the AASC containing rGO nanosheets (0, 0.1, 0.2, and 0.3 wt.%) are investigated. Results showed that rGO nanosheets addition can significantly improve the yield stress, plastic viscosity, thixotropy, and compressive strength of the AASC. The addition of 0.3 wt.% rGO nanosheets increased the stress, viscosity, thixotropy, and strength by 186.77 times, 3.68 times, 15.15 times, and 21.02%, respectively. As for electrical properties, the impedance of the AASC increased when the rGO content was less than 0.2 wt.% but decreased with the increasing dosage. In contrast, the dielectric constant and electrical conductivity of the AASC containing rGO nanosheets decreased and then increased, which can be attributed to the abundant interlayer water and the increasing structural defects as the storage sites for charge carriers, respectively. In addition, the effect of graphene oxide (GO) on the AASC is also studied and the results indicated that the agglomeration of GO nanosheets largely inhibited the application of it in the AASC, even with a small dosage.

scholarly journals Synthesis of diamine functionalised graphene oxide and its application in the fabrication of electrically conducting reduced graphene oxide/polymer nanocomposite films

2020 ◽  
Vol 2 (10) ◽  
pp. 4702-4712
Author(s):  
Namrata Maslekar ◽  
Rabiatul A. Mat Noor ◽  
Rhiannon P. Kuchel ◽  
Yin Yao ◽  
Per B. Zetterlund ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Reduced Graphene Oxide ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Electrically Conducting ◽  
Free Amine ◽  
Reduced Graphene ◽  
Amine Groups

The study focussed on synthesis of colloidally stable diamine functionalised graphene oxide (GO) with dangling free amine groups, and exhibited physicochemical and electrical properties of these functionalised sheets in a polymer-based nanocomposite.

scholarly journals Manufacture and characterization of conductor-insulator composites based on carbon nanotubes and thermally reduced graphene oxide

2014 ◽  
Vol 86 (5) ◽  
pp. 765-774 ◽  
Author(s):  
Chris R. Bowen ◽  
Sam Buschhorn ◽  
Vana Adamaki
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Reduced Graphene Oxide ◽  
Volume Fraction ◽  
Epoxy Composites ◽  
Frequency Dependent ◽  
Reduced Graphene ◽  
Electrical Conductivities ◽  
Conductive Component

AbstractIn this paper we present characterization data for carbon nanotube (CNT)-epoxy and thermally reduced graphene oxide (TRGO)-epoxy nano-composites. The frequency-dependent ac conductivity and permittivity are examined as a function of volume fraction of carbon-based filler. The measured electrical properties and their frequency dependency are evaluated on the basis that such composites can be considered as a network of resistors and capacitors, whereby the resistors represent the conductive component (CNT or TRGO) and the capacitors are the insulating component (epoxy matrix). Differences observed between the frequency-dependent electrical properties of the CNT-epoxy and TRGO-epoxy composites are explained in terms of the different electrical conductivities of the CNT and TRGO phase.

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