A Direct and Polymer-Free Method for Transferring Graphene Grown by Chemical Vapor Deposition to Any Substrate

Abstract

We demonstrate a polymer-free method that can routinely transfer relatively large-area graphene to any substrate with advanced electrical properties and superior atomic and chemical structures as compared to the graphene sheets transferred with conventional polymer-assisted methods. The graphene films that are transferred with polymer-free method show high electrical conductance and excellent optical transmittance. Raman spectroscopy and X-ray/ultraviolet photoelectron spectroscopy also confirm the presence of high quality graphene sheets with little contamination after transfer. Atom-resolved images can be obtained using scanning tunneling microscope on as-transferred graphene sheets without additional cleaning process. The mobility of the polymer-free graphene monolayer is as high as 63,000 cm(2) V(-1) s(-1), which is 50% higher than the similar sample transferred with the conventional method. More importantly, this method allows us to place graphene directly on top of devices made of soft materials, such as organic and polymeric thin films, which widens the applications of graphene in soft electronics.

Wet-transfer of CVD-grown graphene onto sulfur-protected W(110)

“…The C-1 s core level was de-convoluted with a graphene component at 284.1 eV and a much smaller component at 285.1 eV, which is attributed to carbon contamination and/or PMMA residue [33]. The C-1 s binding energy of the graphene component is compared to binding energies also measured in our apparatus for CVD-grown graphene on copper foil and for HOPG.…”

Single-step deposition of high-mobility graphene at reduced temperatures

“…The electrical mobility (m) of PECVDgraphene was determined by studying back-gated field-effecttransistor devices 28,29 . Graphene samples were first transferred to hexagonal boron nitride (BN) thin films on 300 nm SiO 2 /Si substrates using a polymer-free method 23 , and then lithographically processed into a geometry shown in Fig. 5a,b.…”

Progress and Challenges in Transfer of Large‐Area Graphene Films

“…Lin et al transferred the graphene to the target substrates in a “polymer‐free” way by using a graphite holder ( Figure 4 ). 54 They used a thin graphite holder as a confinement area for the monolayer graphene. After the Cu substrate was etched, the etchant was pumped at a rate of 0.3 mL min −1 and the mixed water/IPA solution was simultaneously injected at the same rate.…”