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.

Self-assembly of two-dimensional graphene sheets is an important strategy for producing macroscopic architectures practical applications, such as thin films and layered paperlike materials. However, construction self-assembled macrostructures with three-dimensional networks has never been realized. In this paper, we prepared a hydrogel (SGH) via convenient one-step hydrothermal method. The SGH electrically conductive, mechanically strong, thermally stable exhibits high specific capacitance....

Composite films of chemically converted graphene (CCG) and polyaniline nanofibers (PANI-NFs) were prepared by vacuum filtration the mixed dispersions both components. The composite film has a layered structure, PANI-NFs are sandwiched between CCG layers. Furthermore, it is mechanically stable high flexibility; thus, can be bent into large angles or shaped various desired structures. conductivity containing 44% (5.5 × 102 S m−1) about 10 times that PANI-NF film. Supercapacitor devices based...

Flexible solid-state supercapacitors are of considerable interest as mobile power supply for future flexible electronics. Graphene or carbon nanotubes based thin films have been used to fabricate with high gravimetric specific capacitances (80-200 F/g), but usually a rather low overall areal capacitance (3-50 mF/cm(2)) due the ultrasmall electrode thickness (typically few micrometers) and ultralow mass loading, which is not desirable practical applications. Here we report exploration...

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 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.

Functionalized graphene hydrogels are prepared by a one-step low-temperature reduction process and exhibit ultrahigh specific capacitances excellent cycling stability in the aqueous electrolyte. Flexible solid-state supercapacitors based on functionalized demonstrated with superior capacitive performances extraordinary mechanical flexibility. Electrochemical energy storage is key enabling technology for clean sustainable mobile supply.1-3 In this regard, electrochemical have recently...

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+...

Graphene and its derivatives are versatile building blocks for bottom-up assembly of advanced functional materials. In particular, with exceptionally large specific surface area, excellent electrical conductivity, superior chemical/electrochemical stability, graphene represents the ideal material various electrochemical energy storage devices including supercapacitors. However, due to strong π-π interaction between sheets, flakes tend restack form graphite-like powders when they processed...

Scalable preparation of solution processable graphene and its bulk materials with high specific surface areas designed porosities is essential for many practical applications. Herein, we report a scalable approach to produce aqueous dispersions holey oxide abundant in-plane nanopores via convenient mild defect-etching reaction demonstrate that the can function as versatile building block assembly macrostructures including hydrogels three-dimensional hierarchical porosity papers compact but...

Integrating nanoscale porous metal oxides into three-dimensional graphene (3DG) with encapsulated structure is a promising route but remains challenging to develop high-performance electrodes for lithium-ion battery. Herein, we design 3DG/metal organic framework composite by an excessive metal-ion-induced combination and spatially confined Ostwald ripening strategy, which can be transformed 3DG/Fe2O3 aerogel Fe2O3 nanoframeworks well within graphene. The hierarchical offers highly...

Abstract 2D transition metal carbides and/or nitrides (MXenes), by virtue of high electrical conductivity, abundant surface functional groups and excellent dispersion in various solvents, are attracting increasing attention showing competitive performance energy storage conversion applications. However, like other materials, MXene nanosheets incline to stack together via van der Waals interactions, which lead limited number active sites, sluggish ionic kinetics, finally ordinary...

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...

Integration of graphene with polymers to construct three-dimensional porous graphene/polymer composites (3DGPCs) has attracted considerable attention in the past few years for both fundamental studies and diverse technological applications. With broad diversity molecular structures via rich chemical routes, a number 3DGPCs have been developed unique structural, electrical, mechanical properties, tenability, attractive functions, which greatly expands research horizon graphene-based...

Pseudocapacitors or redox capacitors that synergize the merits of batteries and double-layer are among most promising candidates for high-energy high-power energy storage applications. 2D transition metal carbides (MXenes), an emerging family pseudocapacitive materials with ultrahigh rate capability volumetric capacitance, have attracted much interest in recent years. However, MXenes only been used as negative electrodes they easily oxidized at positive (anodic) potential. To construct a...

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.

Interfacial layers (ILs) are prerequisites to form the selective charge transport for high-performance organic photovoltaics (OPVs) but mostly result in considerable parasitic absorption loss. Trimming ILs down a mono-molecular level via self-assembled monolayer is an effective strategy mitigate However, such suffers from inferior electrical contact with low surface coverage on rough surfaces and poor producibility. To address these issues, here, interlayer (SAI) developed, which involves...

Chemically modified graphenes (CMGs) are unique building blocks for "bottom up" nanotechnology because of their single-atom thickness, two-dimensional conjugated structure, and exceptional physical chemical properties. Various hierarchical structures functional nanocomposites based on CMGs have been prepared by self-assembly. Here, we review the recent advances in assembly solution or at interfaces, demonstrate wide application resulting materials.

A facile strategy to Pt3Ni nanocrystals with highly porous features is developed. The integration of a high surface area and rich step/edge atoms endows the an impressive oxygen reduction reaction (ORR) specific activity mass activity. These are more stable in ORR show small change after 6000 potential sweeps. This promising material for practical electrocatalytic applications.

The efficient synthesis of 2D polymers (2DPs) with tailorable structures and properties is highly desired but remains a considerable challenge. Here, the first solution millimeter-size crystalline covalent triazine frameworks (CTFs) clear lamellar structure, which can be exfoliated into micrometer-size few-layer 2DP sheets via both micromechanical cleavage liquid sonication, reported. obtained CTFs or 2DPs show unique staggered AB stacking dominant pore size ≈0.6 nm, different from common...