Large Area, Multilayer Graphene Films as a Flexible Electronic Material

Abstract

Chemically reduced graphene oxide possesses unique properties and leads to a secure processing method for many applications. The electrical and optical properties of graphene oxide are strongly dependent on the chemical and atomic structure. In the present work, the reduction of synthesized multilayer graphene oxide sheets by both chemical and thermal methods to use them as a substrate in the field of molecular electronic device fabrication is reported. 1-Dodecanethiol molecules are used to covalently bond on the surface atoms of reduced graphene oxide to constitute molecular electronic devices. The metal–organic molecules–reduced graphene oxide–metal junctions show a significant reduction in current levels and weak diode behavior. The observations confirm the tunneling as the conduction mechanism. The sheets are low cost, highly flexible, and can be used as a substrate to build the molecular electronic junctions.

Avoiding Desiccation Cracks during the Formation of Multilayer Graphene Oxide Films

“…In the present study, GO4 and RGO showed an ambipolar behavior, which is confirmed in Figure b. The band diagram of RGO was discussed in our previous work . A negative shift in the Dirac point (from 0.14 to 0 V) is observed in the present study for GO4 and RGO.…”

“…The curves are symmetric in the forward and reverse bias regions, indicating the ohmic charge transport mechanism. The transport mechanism of RGO is investigated in our previous work with the help of a band diagram . Also, it is observed that RGO exhibits higher conductivity than GO4, which is graphene oxide, and a similar behavior is witnessed in the literature and shown in Figure b.…”

“…The band diagram of RGO was discussed in our previous work. 3 A negative shift in the Dirac point (from 0.14 to 0 V) is observed in the present study for GO4 and RGO. The enlarged curves for the Dirac points are shown in Figure 9c.…”

Large‐Area Transient Conductive Films Obtained through Photonic Sintering of 2D Materials

“…Relevant progress has rarely been reported, not to mention transient devices based on large-area vdW thin films that are suitable for high-density arrays of sensors, transistors, and memristors. Although large-area multilayer graphene films have been fabricated by reduction of graphene oxide films, [32] laser ablation of polyimide (PI), [33] and inkjet printing of graphene inks followed by high-temperature annealing, [34] these methods do not apply to transient electronics due to high processing temperature and introduction of aqueous solutions as well as nondegradable materials.…”

Graphene with Ni-Grid as Semitransparent Electrode for Bulk Heterojunction Solar Cells (BHJ-SCs)

“…), (iii) high temperature processing, (iv) high mechanical brittleness and (v) low transparency in the violet region [6,7]. For these reasons, several materials, such as conductive polymers, carbon nanotubes, silver nanowires, metal grids and graphene, have been investigated as alternative TCO for photovoltaic applications [8][9][10][11][12]. The most promising carbon-based materials is the graphene, a two-dimensional layer of carbon atoms covalently bonded in a hexagonal lattice structure.…”