Flexible graphene films were prepared by the filtration of water-soluble noncovalently functionalized sheets with pyrenebutyrate. The work presented here will not only open a new way for preparing dispersions but also provide general route fabricating conducting based on graphene.

The gas sensors fabricated by using conducting polymers such as polyaniline (PAni), polypyrrole (PPy) and poly (3,4-ethylenedioxythiophene) (PEDOT) the active layers have been reviewed. This review discusses sensing mechanism configurations of sensors. factors that affect performances are also addressed. disadvantages a brief prospect in this research field discussed at end review.

Graphene and its functionalized derivatives are unique versatile building blocks for self-assembly to fabricate graphene-based functional materials with hierarchical microstructures. Here we report a strategy three-dimensional of graphene oxide sheets DNA form multifunctional hydrogels. The hydrogels possess high mechanical strength, environmental stability, dye-loading capacity, exhibit self-healing property. This study provides new insight the assembly other blocks, especially...

Graphene oxide/poly(vinyl alcohol) (GO/PVA) composite hydrogel was prepared and utilized for selective drug release at physiological pH.

Graphene oxide (GO) has been recognized as a unique two-dimensional building block for various graphene-based supramolecular architectures. In this article, we systematically studied the three-dimensional self-assembly of GO sheets in aqueous media to form hydrogels. The gelation can be promoted by different interactions, including hydrogen bonding, π-stacking, electrostatic interaction, and coordination. Furthermore, lateral dimensions also have strong influences on gelation. resulting...

Water pollution is one of the most pervasive problems afflicting people throughout world, while adsorption widely used method to remove contaminants from water. Here, in this paper, we report an eco-friendly graphene oxide–chitosan (GO–CS) hydrogel as a new type adsorbent for water purification. The GO–CS hydrogels were prepared via self-assembly GO sheets and CS chains. A three-dimensional network composed crosslinked by was found hydrogels. composite showed high capacity towards different...

Graphene sheets were stably dispersed in water by functionalization with sulfonated polyaniline (SPANI), and the composite film of SPANI-functionalized graphene showed improved electrochemical stability enhanced electrocatalytic activity.

Open vacancies: A facile one-pot synthesis of oxygen-vacancy-rich ultrathin W18O49 nanowires up to several micrometers long is described. In addition unique optical properties, such as NIR absorption and blue-light emission, the show an unexpected ability photochemically reduce carbon dioxide methane (see picture) a result its defect structure caused by large quantities oxygen vacancies.

Complexation of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) and negatively charged chemically converted graphene (CCG) sheets was performed by simply mixing the diluted aqueous solutions both components. During this process, a large bathochromic shift porphyrin Soret band from 421 to 458 nm observed, which is attributed flattening TMPyP molecules induced CCG through electrostatic π−π stacking cooperative interactions. Furthermore, coordination reaction between Cd2+...

Positively charged gold nanoparticles (GNPs) with diameters of 2−6 nm were self-assembled onto the surfaces 1-pyrene butyric acid functionalized graphene (PFG) sheets simply by mixing their aqueous dispersions. The amount GNPs assembled on PFG can be easily modulated controlling feeding weight ratio both components. Furthermore, it was found that had a high loading capability GNPs, and maximum value determined to about 300 times PFG’s own weight. Glassy carbon (GC) electrodes modified...

Metal/semiconductor hybrid materials of various sizes and morphologies have many applications in areas such as catalysis sensing. Various organic agents are necessary to stabilize metal nanoparticles during synthesis, which leads a layer compounds present at the interfaces between particles semiconductor supports. Generally, high-temperature oxidative treatment is used remove organics, can extensively change size morphology particles, turn altering their activity. Here we report facile...

Graphene oxide (GO) sheets prepared by Hummers' method have been separated into two portions with large (f1) or small (f2) lateral dimensions from their aqueous dispersion. This is based on the selective precipitation of GO mostly (>90%) larger than 40 μm2 at a pH value 4.0 because hydrophobic planes and fewer hydrophilic oxygenated groups. The hydrazine reduced Langmuir−Blodgett (LB) films f1 showed much higher conductivities those f2. Furthermore, thin film filtration exhibited smaller...

Graphitic carbon nitride, a polymeric catalyst, was immobilized on the surfaces of chemically converted graphene sheets to form layered composite, which exhibited greatly improved conductivity and electrocatalytic performance oxygen reduction reaction.

Graphene oxide/conducting polymer (GO/CP) composite hydrogels were prepared by in situ chemical polymerization of corresponding aromatic monomers aqueous dispersions GO sheets. GO/polypyrrole (PPy), GO/poly(3,4-ethylenedioxythiophene) (PEDOT) and GO/polyaniline (PANi) obtained this technique, the mechanism gelation was discussed. Among them, GO/PPy tested to have low critical hydrogel concentrations (<1%, weight), high storage moduli (>10 kPa) electrical conductivity, strong electrochemical...

The mechanism of self-discharge (SDC) in active electrolyte enhanced supercapacitors was investigated, and two strategies were devised to suppress the SDC process.

Abstract Compared with noble metals, semiconductors surface plasmon resonance effect are another type of SERS substrate materials. The main obstacles so far that the semiconducting materials often unstable and easy to be further oxidized or decomposed by laser irradiating contacting corrosive substances. Here, we report metallic MoO 2 can used as a detect trace amounts highly risk chemicals including bisphenol A (BPA), dichloropheno (DCP), pentachlorophenol (PCP) on. minimum detectable...

It is critically important to develop actuator systems for diverse needs ranging from robots and sensors memory chips. The advancement of mechanical actuators depends on the development new materials rational structure design. In this study, we have developed a novel graphene electrochemical based rationally designed monolithic film with asymmetrically modified surfaces. Hexane O2 plasma treatment were applied opposite sides induce asymmetrical surface properties hence responses, responsible...

Two-step self-assembly between polyaniline and graphene oxide leads to a porous composite with high uniformity excellent rate performance.

A general method for the fabrication of three-dimensional (3D) porous graphene-based composite materials is reported. This involves two consecutive electrochemical steps. Firstly, 3D graphene (ERGO) material prepared electrochemically by reducing a concentrated oxide dispersion. Subsequently, second component deposited onto this ERGO matrix, yielding material. The have conductive network as which homogeneously coated. Conducting polymers, noble metal nanoparticles and were successfully...

A graphene oxide/hemoglobin (GO/Hb) composite hydrogel was prepared for catalyzing a peroxidatic reaction in organic solvents with high yields, exceptional activity and stability.