Although graphene-enhanced Raman spectroscopy has been investigated for several years, there have been no studies that have applied it to real-time observations of chemical catalytic reactions. Here, we report that UV/ozone-treated oxidized graphene was used to both control and monitor the photoreduction of an adsorbed nitroaromatic dye compound. Graphene-enhanced Raman spectroscopy studies show that more oxidized graphene surface leads to faster photoreduction. This is due to the lowering of the Fermi level in the oxidized graphene, which is in agreement with the highest occupied molecular orbital level of the adsorbed dye molecule, leading to a rapid electron transfer from graphene to the dye. Our findings will be useful in understanding and exploiting the photocatalytic properties of oxidized graphene on adsorbed molecular species.

中文翻译：

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石墨烯增强拉曼光谱揭示了氧化石墨烯表面上硝基芳族化合物的受控光还原

尽管已经研究了石墨烯增强拉曼光谱，但是还没有研究将其应用于化学催化反应的实时观察。在这里，我们报告紫外线/臭氧处理的氧化石墨烯被用来控制和监视吸附的硝基芳族染料化合物的光还原。石墨烯增强的拉曼光谱研究表明，氧化程度更高的石墨烯表面可导致更快的光还原。这是由于降低了氧化石墨烯中的费米能级，这与吸附的染料分子的最高占据分子轨道能级一致，从而导致电子从石墨烯快速转移至染料。我们的发现将有助于理解和利用氧化石墨烯对吸附的分子种类的光催化性能。