An effective non-covalent grafting approach to functionalize individually dispersed reduced graphene oxide sheets with high grafting density, solubility and electrical conductivity

Nanoscale ◽  
2015 ◽  
Vol 7 (8) ◽  
pp. 3548-3557 ◽  
Author(s):  
Hao Wang ◽  
Shu-Guang Bi ◽  
Yun-Sheng Ye ◽  
Yang Xue ◽  
Xiao-Lin Xie ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphene Sheets ◽  
Grafting Density ◽  
Reduced Graphene ◽  
Covalent Grafting ◽  
Potential Applications ◽  
Graphene Oxide Sheets

Polymer-functionalized reduced graphene oxide (polymer-FG), produced as individually dispersed graphene sheets, offers new possibilities for the production of nanomaterials that are useful for a broad range of potential applications.

scholarly journals Improvement in conductivity and thermal stability of polystyrene with two-step reduced graphene oxide based nanocomposite Graphene /polystyrene

2014 ◽  
Vol 17 (2) ◽  
pp. 90-99
Author(s):  
Vy Tuong Nguyen ◽  
An Nang Vu ◽  
Huy Thuc Ha
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Microemulsion Synthesis ◽  
Thermal Stability Of ◽  
Graphene Oxide Sheets

In insitu microemulsion synthesis, we have synthesized successfully nanocomposite based on polystyrene (PS) and two-step reduced graphene oxide sheets with heat and NaBH4 agent after they had been treated by monoglyceride. Resulted Nanocomposite has been better in electrical conductivity (approximately 2,01 × 10-2S / cm), thermal stability (increased about 120 oC) and physical properties (glass transition temperatureincreasesof over 6.40 oC, elastic modulus increases by 45 %) than the pure PS properties.

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.

scholarly journals Lerf–Klinowski-type models of graphene oxide and reduced graphene oxide are robust in analyzing non-covalent functionalization with porphyrins

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexandra Siklitskaya ◽  
Ewelina Gacka ◽  
Daria Larowska ◽  
Marta Mazurkiewicz-Pawlicka ◽  
Artur Malolepszy ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Excited States ◽  
Reduced Graphene ◽  
Simulation Protocol ◽  
Potential Applications ◽  
H 26 ◽  
High Level ◽  
Experimental And Theoretical Studies ◽  
Low Solubility

AbstractGraphene-based nanohybrids are good candidates for various applications. However, graphene exhibits some unwanted features such as low solubility in an aqueous solution or tendency to aggregate, limiting its potential applications. On the contrary, its derivatives, such as graphene oxide (GO) and reduced graphene oxide (RGO), have excellent properties and can be easily produced in large quantities. GO/RGO nanohybrids with porphyrins were shown to possess great potential in the field of photocatalytic hydrogen production, pollutant photodegradation, optical sensing, or drug delivery. Despite the rapid progress in experimental research on the porphyrin-graphene hybrids some fundamental questions about the structures and the interaction between components in these systems still remain open. In this work, we combine detailed experimental and theoretical studies to investigate the nature of the interaction between the GO/RGO and two metal-free porphyrins 5,10,15,20-tetrakis(4-aminophenyl) porphyrin (TAPP) and 5,10,15,20-tetrakis(4-hydroxyphenyl) porphyrin (TPPH)]. The two porphyrins form stable nanohybrids with GO/RGO support, although both porphyrins exhibited a slightly higher affinity to RGO. We validated finite, Lerf–Klinowski-type (Lerf et al. in J Phys Chem B 102:4477, 1998) structural models of GO ($$\hbox {C}_{59}\hbox {O}_{26}\hbox {H}_{26}$$ C 59 O 26 H 26 ) and RGO ($$\hbox {C}_{59}\hbox {O}_{17}\hbox {H}_{26}$$ C 59 O 17 H 26 ) and successfully used them in ab initio absorption spectra simulations to track back the origin of experimentally observed spectral features. We also investigated the nature of low-lying excited states with high-level wavefunction-based methods and shown that states’ density becomes denser upon nanohybrid formation. The studied nanohybrids are non-emissive, and our study suggests that this is due to excited states that gain significant charge-transfer character. The presented efficient simulation protocol may ease the properties screening of new GO/RGO-nanohybrids.

Chemically reduced graphene oxide-coated knitted fabric imparted conductivity and outstanding hydrophobicity

2021 ◽  
pp. 004051752199547
Author(s):  
Min Hou ◽  
Xinghua Hong ◽  
Yanjun Tang ◽  
Zimin Jin ◽  
Chengyan Zhu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Reduction ◽  
Knitted Fabric ◽  
Mesh Structure ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide ◽  
Modified Hummers Method

Functionalized knitted fabric, as a kind of flexible, wearable, and waterproof material capable of conductivity, sensitivity and outstanding hydrophobicity, is valuable for multi-field applications. Herein, the reduced graphene oxide (RGO)-coated knitted fabric (polyester/spandex blended) is prepared, which involves the use of graphite oxide (GO) by modified Hummers method and in-situ chemical reduction with hydrazine hydrate. The treated fabric exhibits a high electrical conductivity (202.09 S/cm) and an outstanding hydrophobicity (140°). The outstanding hydrophobicity is associated with the morphology of the fabric and fiber with reference to pseudo-infiltration. These properties can withstand repeated bending and washing without serious deterioration, maintaining good electrical conductivity (35.70 S/cm) and contact angle (119.39°) after eight standard washing cycles. The material, which has RGO architecture and continuous loop mesh structure, can find wide use in smart garment applications.

Investigation of Raman and photoluminescence studies of reduced graphene oxide sheets

2011 ◽  
Vol 106 (3) ◽  
pp. 501-506 ◽  
Author(s):  
Karthikeyan Krishnamoorthy ◽  
Murugan Veerapandian ◽  
Rajneesh Mohan ◽  
Sang-Jae Kim
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Photoluminescence Studies ◽  
Graphene Oxide Sheets

scholarly journals Surface plasmon enhanced photoluminescence of ZnO nanorods by capping reduced graphene oxide sheets

2014 ◽  
Vol 22 (10) ◽  
pp. 11436 ◽  
Author(s):  
Feng Han ◽  
Shuming Yang ◽  
Weixuan Jing ◽  
Kyle Jiang ◽  
Zhuangde Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Plasmon ◽  
Zno Nanorods ◽  
Enhanced Photoluminescence ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets

Study of Electrical Conductivity of Pyrrole-Reduced Graphene Oxide Pellet

2021 ◽  
Author(s):  
Sara Maira Mohd Hizam ◽  
Nurul Izza Soaid ◽  
Mohamed Shuaib Mohamed Saheed ◽  
Norani Muti Mohamed ◽  
Chong Fai Kait
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene

Tethering mesoporous Pd nanoparticles to reduced graphene oxide sheets forms highly efficient electrooxidation catalysts

2017 ◽  
Vol 5 (40) ◽  
pp. 21249-21256 ◽  
Author(s):  
Muhammad Iqbal ◽  
Cuiling Li ◽  
Bo Jiang ◽  
Md. Shahriar A. Hossain ◽  
Md. Tofazzal Islam ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Pd Nanoparticles ◽  
Solution Phase ◽  
Phase Synthesis ◽  
Highly Efficient ◽  
Reduced Graphene ◽  
Solution Phase Synthesis ◽  
Graphene Oxide Sheets

Uniformly sized mesoporous palladium (Pd) nanoparticles supported on reduced graphene oxide (rGO) surfaces can be prepared by solution phase synthesis.

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