Realization of Large-Area Wrinkle-Free Monolayer Graphene Films Transferred to Functional Substrates

Abstract

Structural inhomogeneities, such as the wrinkles and ripples within a graphene film after transferring the free-standing graphene layer to a functional substrate, degrade the physical and electrical properties of the corresponding electronic devices. Here, we introduced titanium as a superior adhesion layer for fabricating wrinkle-free graphene films that is highly applicable to flexible and transparent electronic devices. The Ti layer does not influence the electronic performance of the functional substrates. Experimental and theoretical investigations confirm that the strong chemical interactions between Ti and any oxygen atoms unintentionally introduced on/within the graphene are responsible for forming the clean, defect-free graphene layer. Our results accelerate the practical application of graphene-related electronic devices with enhanced functionality. The large-area monolayer graphenes were prepared by a simple attachment of the Ti layer with the multi-layer wrinkle-free graphene films. For the first time, the graphene films were addressed for applications of superior bottom electrode for flexible capacitors instead of the novel metals.

Study on Nitrogen-Doped Graphene Ink and Its Effects on the Heat Dissipation for the LED Lamps

“…The roughness R q can be an index of wrinkles and defects for the graphene film. The roughness R q of the NDG sample in this study was 0.9 nm, the same as that of graphene on glass with a Ti coating thickness of about 4 nm in [22]. 3.…”

“…Different roughness measurements were calculated as shown in Table 2, and include the vertical distance roughness, central line average roughness R a , ten points average roughness R z , maximum height roughness R max , and root-mean-squared (rms) roughness R q . As stated in [22], R q with an inspection area of 5 × 5 um 2 was used as an index for a large-area graphene to be wrinkle-free and defect-free, or not. According to the results in the study, R q was about 3.5-4.0 nm for graphene on glass without a titanium (Ti) coating.…”

“…According to the results in the study, R q was about 3.5-4.0 nm for graphene on glass without a titanium (Ti) coating. With the glass coated with Ti in [22], the value of R q would decrease significantly for the graphene film, which had less wrinkles or defects. It is estimated for the results from [22] that the value of R q in this study was 0.9 nm, the same as that of graphene on glass with a coating thickness of Ti of about 4 nm.…”

Ångström-Scale, Atomically Thin 2D Materials for Corrosion Mitigation and Passivation

“…Researchers have taken contrasting stances on the existence of post-transfer wrinkle formation in 2D materials [156][157][158][159]. Nonetheless, studies have uncovered a strong dependence of corrosion on wrinkles, folded wrinkles, and ripples.…”

Growth Mechanism for Low Temperature PVD Graphene Synthesis on Copper Using Amorphous Carbon

“…Non-transferable Graphene synthesis is important especially for ULSI Interconnects which are used in BEOL (back-end-of-line) process and transfer of Graphene is quite infeasible. Moreover, the transfer of Graphene introduces many structural inhomogeneities which causes degradation of properties of graphene such as the mobility, electrical and thermal conductivity etc 18 19 20 . However, such Graphene synthesis method was reported to be not possible with Copper due to the very low solubility of Carbon in Copper 16 17 .…”