Single step synthesis of chitin/chitosan-based graphene oxide–ZnO hybrid composites for better electrical conductivity and optical properties

2013 ◽  
Vol 90 ◽  
pp. 194-202 ◽  
Author(s):  
S. Anandhavelu ◽  
S. Thambidurai
Keyword(s):  
Electrical Conductivity ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Hybrid Composites ◽  
Single Step

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.

Oscillation in the electrical conductivity of a thick graphene oxide membrane

2021 ◽  
Vol 129 (23) ◽  
pp. 235105
Author(s):  
L. Jamilpanah ◽  
M. Alihosseini ◽  
S. Ghasemi ◽  
N. Hassani ◽  
F. Peymanirad ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Oxide Membrane

Electrical conductivity and hydrophobicity of graphene oxide-modified carbon nanofibers

2021 ◽  
pp. 138551
Author(s):  
He-Dong Huang ◽  
Zeyu Guo ◽  
Peng-yan Yang ◽  
Peng Chen ◽  
Jie Wu
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Carbon Nanofibers

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.

Optical properties of hybrid composites based on highly luminescent CdS nanocrystals in polymer

2004 ◽  
Vol 15 (4) ◽  
pp. S240-S244 ◽  
Author(s):  
M Tamborra ◽  
M Striccoli ◽  
R Comparelli ◽  
M L Curri ◽  
A Petrella ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hybrid Composites ◽  
Cds Nanocrystals

Electrical conductivity and optical properties of a new quaternized polysulfone

2011 ◽  
Vol 68 (6) ◽  
pp. 1641-1661 ◽  
Author(s):  
Luminita-Ioana Buruiana ◽  
Ecaterina Avram ◽  
Adriana Popa ◽  
Valentina Elena Musteata ◽  
Silvia Ioan
Keyword(s):  
Electrical Conductivity ◽  
Optical Properties

pH-Mediated fine-tuning of optical properties of graphene oxide membranes

Carbon ◽  
2012 ◽  
Vol 50 (9) ◽  
pp. 3233-3239 ◽  
Author(s):  
Wei Lv ◽  
Cong-Hui You ◽  
Sida Wu ◽  
Baohua Li ◽  
Zhen-Ping Zhu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Fine Tuning ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes
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