Reduction of metal nanoparticle decorated flexible graphene oxide by laser at various temperatures and under selected atmospheres

Carbon trends(2021)

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摘要
In situ Raman spectroscopy of flexible films of bare graphene oxide (GO) and GO decorated with Pt and Au nanoparticles (NPs) were examined upon exposure to synthetic air and 1% hydrogen in synthetic air. Initially, GO possesses an sp 2 rich-structure at room temperature; however, it suffers from a drastic sp 2 loss at higher temperatures under argon laser exposure leading to structural damage above 65 °C. Conversely, metal nano particle (MNP) decorated GO undergoes a drastic reduction of sp 2 content mainly due to an increased defect density. In MNP composites, the formation rate of reduced graphene oxide (rGO) elevates at higher temperatures leading to an improvement in the sp 2 fraction to some extent under argon laser exposure. In fact, the optical properties of MNP decorated GO drastically change against those of bare GO. Despite Pt NPs demonstrating a large catalytic effect with temperature, Au NPs do not. Similarly, the catalytic effect of Pt-GO gives rise to a slight excess in rGO formation in favor of the sp 2 domain recovery. Here, there is a dominant temperature effect and a minor catalytic effect during laser exposure to GO.
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关键词
Graphene Oxide, Reduced Graphene Oxide (rGO), Hummer's method, Au/Pt NPs, Atomic Hydrogen, In situ Raman Spectroscopy
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