Physical and Electrical Characterization of Synthesized Millimeter Size Single Crystal Graphene, Using Controlled Bubbling Transfer

Abstract

In this work, we have investigated the influence of the transfer process on the monocrystalline graphene in terms of quality, morphology and electrical properties by analyzing the data obtained from optical microscopy, scanning electron microscopy, Raman spectroscopy and electrical characterizations. The influence of Cu oxidation on graphene prior to the transfer is also discussed. Our results show that the controlled bubbling electrochemical delamination transfer is an easy and fast transfer technique suitable for transferring large single crystals graphene without degrading the graphene quality. Moreover, Raman spectroscopy investigation reveals that the Cu surface oxidation modifies the strain of the graphene film. We have observed that graphene laying on unoxidized Cu is subject to a biaxial strain in compression, while graphene on Cu oxide is subject to a biaxial strain in tension. However, after graphene was transferred to a host substrate, these strain effects were strongly reduced, leaving a homogeneous graphene on the substrate. The transferred single crystal graphene on silicon oxide substrate was used to fabricate transmission line method (TLM) devices. Electrical measurements show low contact resistance ~150 Ω·µm, which confirms the homogeneity and high quality of transferred graphene.

The cascade matrix electron flow amplifier based on an electron multiplier concentrator

“…As was already noted, the use of graphene films is a sound solution to the screening problem, but these films need to be uniform. No well-proven techniques for fabrication of films with an area in excess of 1 mm 2 are available at present, although graphene single crystals with an area of ∼ 10 mm 2 were produced in a laboratory environment [11]. In fact, an entire matrix of 12 000 graphene single crystals, which was transferred onto a silicon plate, was produced experimentally [12].…”

State-of-the-Art 2D and Carbon Nanomaterials in France

“…Additionally, this issue includes research on the transfer process of monocrystalline graphene and its influence on the quality, morphology, and electrical properties of the transferred graphene [7]. The controlled bubbling electrochemical delamination transfer technique was identified as a suitable method for transferring large single-crystal graphene without degrading its quality, offering valuable insights for its practical applications and paving the way for the development of reliable high-performance graphene-based devices.…”