Electrical conductivity studies on water-soluble polypyrrole-graphene oxide composites

2011 ◽  
Vol 32 (12) ◽  
pp. 2076-2083 ◽  
Author(s):  
C. Basavaraja ◽  
Won Jung Kim ◽  
P.X. Thinh ◽  
Do Sung Huh
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Water Soluble ◽  
Oxide Composites

Electrical conductivity of silicon carbonitride-reduced graphene oxide composites

2017 ◽  
Vol 100 (11) ◽  
pp. 5113-5119 ◽  
Author(s):  
Yuxi Yu ◽  
Fansen Xia ◽  
Qifan Huang ◽  
Jiyu Fang ◽  
Linan An
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Silicon Carbonitride ◽  
Reduced Graphene ◽  
Oxide Composites

Influence of graphene oxide synthesis methods on the electrical conductivity of cotton/graphene oxide composites

2020 ◽  
pp. 1-11
Author(s):  
Camilo Zapata-Hernandez ◽  
Geraldine Durango-Giraldo ◽  
Karen Cacua ◽  
Robison Buitrago-Sierra
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Synthesis Methods ◽  
Oxide Composites

scholarly journals Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical, Conductive and Gas Barrier Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 858 ◽  
Author(s):  
Benoit Van der Schueren ◽  
Hamza El Marouazi ◽  
Anurag Mohanty ◽  
Patrick Lévêque ◽  
Christophe Sutter ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Transmission Rate ◽  
Composite Films ◽  
Barrier Properties ◽  
Water Soluble ◽  
Gas Barrier ◽  
Layer Graphene ◽  
Few Layer Graphene

Quasi all water soluble composites use graphene oxide (GO) or reduced graphene oxide (rGO) as graphene based additives despite the long and harsh conditions required for their preparation. Herein, polyvinyl alcohol (PVA) films containing few layer graphene (FLG) are prepared by the co-mixing of aqueous colloids and casting, where the FLG colloid is first obtained via an efficient, rapid, simple, and bio-compatible exfoliation method providing access to relatively large FLG flakes. The enhanced mechanical, electrical conductivity, and O2 barrier properties of the films are investigated and discussed together with the structure of the films. In four different series of the composites, the best Young’s modulus is measured for the films containing around 1% of FLG. The most significant enhancement is obtained for the series with the largest FLG sheets contrary to the elongation at break which is well improved for the series with the lowest FLG sheets. Relatively high one-side electrical conductivity and low percolation threshold are achieved when compared to GO/rGO composites (almost 10−3 S/cm for 3% of FLG and transport at 0.5% FLG), while the conductivity is affected by the formation of a macroscopic branched FLG network. The composites demonstrate a reduction of O2 transmission rate up to 60%.

scholarly journals Graphene and Graphene Oxide Composites and Their Electrorheological Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Wen Ling Zhang ◽  
Jingquan Liu ◽  
Hyoung Jin Choi
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Relaxation Time ◽  
Dynamic Properties ◽  
Dispersed Phase ◽  
Dielectric Analysis ◽  
Paper Briefly ◽  
Composite Systems ◽  
Lcr Meter ◽  
Oxide Composites

Graphene oxide (GO) based composite systems have been fabricated and investigated as a novel electroresponsive electrorheological (ER) dispersed phase because of their proper electrical conductivity and polarizability for their ER application, in addition to graphene composites. This paper briefly reviews mechanisms of the fabrication of various graphene and GO based composites and their critical ER characteristics including flow curve, yield stress, and dynamic properties measured using a rotational rheometer. Relaxation time and achievable polarizability from dielectric analysis using a LCR meter are also discussed.

scholarly journals Graphene Oxide: A Smart (Starting) Material for Natural Methylxanthines Adsorption and Detection

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4247 ◽  
Author(s):  
Rita Petrucci ◽  
Isabella Chiarotto ◽  
Leonardo Mattiello ◽  
Daniele Passeri ◽  
Marco Rossi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Nucleic Acids ◽  
Reduced Graphene Oxide ◽  
Electrochemical Sensors ◽  
Enzymatic Digestion ◽  
Biologically Active ◽  
Polar Solvents ◽  
Dna And Rna ◽  
Reduced Graphene

Natural methylxanthines, caffeine, theophylline and theobromine, are widespread biologically active alkaloids in human nutrition, found mainly in beverages (coffee, tea, cocoa, energy drinks, etc.). Their detection is thus of extreme importance, and many studies are devoted to this topic. During the last decade, graphene oxide (GO) and reduced graphene oxide (RGO) gained popularity as constituents of sensors (chemical, electrochemical and biosensors) for methylxanthines. The main advantages of GO and RGO with respect to graphene are the easiness and cheapness of synthesis, the notable higher solubility in polar solvents (water, among others), and the higher reactivity towards these targets (mainly due to – interactions); one of the main disadvantages is the lower electrical conductivity, especially when using them in electrochemical sensors. Nonetheless, their use in sensors is becoming more and more common, with the obtainment of very good results in terms of selectivity and sensitivity (up to 5.4 × 10−10 mol L−1 and 1.8 × 10−9 mol L−1 for caffeine and theophylline, respectively). Moreover, the ability of GO to protect DNA and RNA from enzymatic digestion renders it one of the best candidates for biosensors based on these nucleic acids. This is an up-to-date review of the use of GO and RGO in sensors.

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