Abstract
In this work, we report the transfer of graphene onto eight commercial microfiltration substrates having different pore sizes and surface characteristics. Monolayer graphene grown on copper by the chemical vapor deposition (CVD) process was transferred by the pressing method over the target substrates, followed by wet etching of copper to obtain monolayer graphene/polymer membranes. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle (CA) measurements were carried out to explore the graphene layer transferability. Three factors, namely, the substrate roughness, its pore size, and its surface wetting (degree of hydrophobicity) are found to affect the conformality and coverage of the transferred graphene monolayer on the substrate surface. A good quality graphene transfer is achieved on the substrate with the following characteristics; being hydrophobic (CA > 90°), having small pore size, and low surface roughness, with a CA to RMS (root mean square) ratio higher than 2.7°/nm.
Highlights
Graphene as a carbon-based nanomaterial is attractive from the standpoint of science and technology due to its exceptional properties
We examine the effect of substrate surface characteristics in terms of pore size, wettability, and surface roughness on the graphene transferability experimentally
Field Emission Scanning Electron Microscope (FESEM), and water wettability the as received membranes and the atomic force microscopy (AFM), graphene/polymer membranes characterizations were carried out tofor understand the rolepolymer of the substrate and the graphene/polymer were carried outastowell understand the role the substrate surface surface characteristics onmembranes the graphene transferability as its coverage andof quality
Summary
Graphene as a carbon-based nanomaterial is attractive from the standpoint of science and technology due to its exceptional properties. With the aforementioned unusual properties, graphene opens doors for many applications across disciplines It is used in electronic applications as transistors [12], chemical and biosensors [13], transparent conducting electrodes [14,15], optoelectronics [16,17,18], and in medical applications such as tissue engineering [19] and drug delivery [20]. Environmental applications mainly involve water purification [26]
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