Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
Nano Lett. 2011 Jun 8;11(6):2342-7. doi: 10.1021/nl2006438. Epub 2011 May 17.
Graphene is a novel two-dimensional nanomaterial that holds great potential in electronic and sensor applications. By etching the edges to form nanoribbons or introducing defects on the basal plane, it has been demonstrated that the physical and chemical properties of graphene can be drastically altered. However, the lithographic or chemical techniques required to reliably produce such nanoribbons remain challenging. Here, we report the fabrication of nanosensors based on holey reduced graphene oxide (hRGO), which can be visualized as interconnected graphene nanoribbons. In our method, enzymatic oxidation generated holes within the basal plane of graphene oxide, and after reduction with hydrazine, hRGO was formed. When decorated with Pt nanoparticles, hRGO exhibited a large and selective electronic response toward hydrogen gas. By combining experimental results and theoretical modeling, we propose that the increased edge-to-plane ratio, oxygen moieties, and Pt nanoparticle decoration were responsible for the observed gas sensing with hRGO nanostructures.
石墨烯是一种新型二维纳米材料，在电子和传感器应用方面具有巨大潜力。通过对边缘进行刻蚀形成纳米带，或在基面引入缺陷，可以显著改变石墨烯的物理和化学性质。然而，要可靠地生产这种纳米带，所需的光刻或化学技术仍然具有挑战性。在这里，我们报告了基于具有孔的还原氧化石墨烯（hRGO）的纳米传感器的制造，它可以被视为相互连接的石墨烯纳米带。在我们的方法中，酶氧化在氧化石墨烯的基面内产生孔，然后用联氨还原，形成 hRGO。当用铂纳米颗粒进行修饰时，hRGO 对氢气表现出大的和选择性的电子响应。通过结合实验结果和理论建模，我们提出增加的边缘到平面的比例、氧部分和 Pt 纳米颗粒的修饰是导致 hRGO 纳米结构观察到的气体传感的原因。
