Abstract
2D β-Ga2O3 flakes on a continuous 2D graphene film were prepared by a one-step chemical vapor deposition on liquid gallium surface. The composite was characterized by optical microscopy, scanning electron microscopy, Raman spectroscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy (XPS). The experimental results indicate that Ga2O3 flakes grew on the surface of graphene film during the cooling process. In particular, tenfold enhancement of graphene Raman scattering signal was detected on Ga2O3 flakes, and XPS indicates the C-O bonding between graphene and Ga2O3. The mechanism of Raman enhancement was discussed. The 2D Ga2O3-2D graphene structure may possess potential applications.
Highlights
The assembly of graphene with other nanostructures can broaden the graphene applications
The assembly of functional materials on continuous graphene films synthesized by chemical vapor deposition (CVD) has been attracting attention gradually, owing to the high quality of graphene films
Liquid Ga is very effective for graphene formation, and it can remain liquid under room temperature
Summary
The assembly of graphene with other nanostructures can broaden the graphene applications. Considerable investigation has been carried out on the assembly of graphene powder with functional materials, such as reduced graphene oxide-TiO2 composites to enhance photocatalytic degradation activity [1,2,3], graphene-MoS2 for high effective hydrogen evolution reaction [4,5], and grapheneCo3O4/Fe3O4 as anode material for lithium ion battery [6,7,8,9]. The other approach is the mixing of reduced graphene oxide with the other materials followed by post-thermal reduction [6,8,9]. The assembly of functional materials on continuous graphene films synthesized by chemical vapor deposition (CVD) has been attracting attention gradually, owing to the high quality of graphene films. A thin amorphous aluminum oxide layer was deposited on a graphene film through atomic layer deposition to selectively
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