Large area orientation films based on graphene oxide self-assembly and low-temperature thermal reduction

Abstract

Graphene oxide (GO) and reduced graphene oxide (RGO) have many outstanding physical and mechanical properties. Uniform and thickness controllable RGO films with large area were prepared by evaporation-induced self-assembly at a liquid/air interface on glass substrates in combination with low temperature thermal reduction at 200 °C. This process has the advantage of good compatibility with flexible and non-flexible substrates. The films are of centimeter scale and their thickness can be controlled. The structural evolution was characterized. The obtained thermal RGO films exhibit excellent optical properties, a high elastic modulus of 76.18 GPa, and a hardness of 6.89 GPa.

A New Electrochemical Approach for the Synthesis of Copper-Graphene Nanocomposite Foils with High Hardness

“…It is also plausible that GO in the Cu matrix could partially reduce to Gr during the electrodeposition because of application of large cathodic pulses during the deposition process. It has been reported that Gr and GO exhibit hardness and modulus in the same range, where GO shows a slightly lower hardness32. Figure 1 (a–e) represents the schematic of the electrodeposition process employed in the current investigation.…”

Recent advances in electrochemical biosensing schemes using graphene and graphene-based nanocomposites

“…Self-assembly of GO with well-defined hierarchical structures is another emerging topic with considerable interest [62][63][64][65][66][67][68][69]. However, a post reduction step by thermal or chemical treatment is required to enhance the film's electrical conductivity [66,69], a prerequisite for applications in various biosensing platforms.…”

“…However, a post reduction step by thermal or chemical treatment is required to enhance the film's electrical conductivity [66,69], a prerequisite for applications in various biosensing platforms. This step often adversely affects the film integrity and cannot be used for the preparation of graphene and a biomolecule of interest layer-by-layer.…”

Imaging Orientation of a Single Molecular Hierarchical Self-Assembled Sheet: The Combined Power of a Vibrational Sum Frequency Generation Microscopy and Neural Network

“…Comparable to the well-studied system of self-assembled monolayer on metal substrates, we believed the driving force of the tilting could be the interplay of intermolecular interactions (such as hydrogen bonds) among subunits and binding behaviors between subunits and substrate. 22,27,78,79 It had been widely studied that the tilt of molecules within monolayers commonly existed in selfassembled materials and potentially adjusted the conduction 80,81 , wetting 82,83 , or mechanical properties 80,84,85 . With SDS@2β-CD as an important biomimetic motif, the tilt angle resolved in our neural network approach sheds light on how the subunits pack within the self-assembly and provids a protocol to study other MSA systems structure-properties correlations.…”