Abstract Although the formation of nanographenes such as graphene nanoribbons (GNRs) has been widely investigated, the formation methods are still severely limited by the lack of a suitable method for applying them. To address this, we investigated the use of soft X-rays to form GNRs. Precursor films were prepared by hot mesh deposition (HMD) using pentacene molecules and H2 gas. Various nanocarbon films, namely pentacene, 6,13-dihydropentacene, and a mixture of pentacene, 6,13-dihydropentacene, and pentacene oligomers were prepared by HMD then irradiated using soft X-rays generated in the NewSUBARU synchrotron radiation facility. The properties of the nanocarbon films synthesized from pentacene, 6,13-dihydropentacene, and pentacene oligomers by soft X-ray irradiation differed. The hydrogen desorption and catalytic effect of the Ni film on the quartz substrate during soft X-ray irradiation enhanced the polymerization of pentacene. The pentacene oligomers acted as nuclei for graphene formation. Although GNRs were not synthesized by soft X-ray irradiation, graphene was obtained with a high yield at a low temperature of 760 °C.

中文翻译：

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通过软X射线辐射从并五苯合成石墨烯

摘要 尽管石墨烯纳米带（GNRs）等纳米石墨烯的形成已得到广泛研究，但由于缺乏合适的应用方法，其形成方法仍然受到严重限制。为了解决这个问题，我们研究了使用软 X 射线来形成 GNR。前体薄膜是通过热网沉积 (HMD) 使用并五苯分子和 H2 气体制备的。各种纳米碳薄膜，即并五苯、6,13-​​二氢并五苯以及并五苯、6,13-​​二氢并五苯和并五苯低聚物的混合物通过 HMD 制备，然后使用 NewSUBARU 同步加速器辐射设施中产生的软 X 射线进行照射。通过软 X 射线照射由并五苯、6,13-​​二氢并五苯和并五苯低聚物合成的纳米碳薄膜的性质不同。在软 X 射线照射下，Ni 膜在石英衬底上的氢解吸和催化作用增强了并五苯的聚合。并五苯低聚物充当石墨烯形成的核。尽管 GNRs 不是通过软 X 射线照射合成的，但在 760°C 的低温下以高产率获得了石墨烯。