论文标题
石墨烯纳米疗和纳米骨的自下而上的生长
Bottom-up Growth of Graphene Nanospears and Nanoribbons
论文作者
论文摘要
石墨烯纳米容器（GNR）被认为是下一代电子产品最有前途的材料之一，但是仍然缺乏可靠且可控制的合成方法。在这里，我们报告了GNR在铜表面上的CVD生长以及相应的生长机制。一维GNR生长是通过液体催化剂颗粒的表面传播引导的蒸气液（VLS）石墨烯生长来实现的。通过调整生长过程中H2的流量来控制沿GNR的宽度方向抑制蒸气 - 固 - 固 - 固烯（VSS）石墨烯的生长，这会导致矛头形石墨烯，我们称其为石墨烯纳米谱（GNSS）。实时视觉和空间解析的观测结果证实，可以完全抑制石墨烯的VSS生长，并导致CU表面的GNR形成。这些发现揭示了对石墨烯的生长机制的关键见解，并为实现合成自由常规GNR的轻松而可扩展的方法打开了一扇门。
Graphene nanoribbons (GNRs) are considered one of the most promising materials for next generation electronics, however a reliable and controllable synthesis method is still lacking. Here, we report the CVD growth of GNRs on a copper surface and the corresponding mechanisms of growth. One-dimensional GNR growth is enabled by a vapor-liquid-solid (VLS) graphene growth guided by on-surface propagation of a liquid catalyst particle. Controlling the suppression of vapor-solid-solid (VSS) graphene growth along the width direction of the GNR by tuning the flow of H2 during growth gives rise to a spear head-shaped graphene that we term graphene nanospears (GNSs). The real-time visual and spatially resolved observations confirm the VSS growth of graphene can be fully suppressed and lead to GNR formation on Cu surface. These findings reveal key insight into the growth mechanism of graphene and open a door for achieving a facile and scalable method of synthesizing free standing GNRs.
