Network for Computational Nanotechnology, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States.
Nano Lett. 2011 Nov 9;11(11):5020-5. doi: 10.1021/nl203041n. Epub 2011 Oct 24.
Traditional transparent conducting materials such as ITO are expensive, brittle, and inflexible. Although alternatives like networks of carbon nanotubes, polycrystalline graphene, and metallic nanowires have been proposed, the transparency-conductivity trade-off of these materials makes them inappropriate for broad range of applications. In this paper, we show that the conductivity of polycrystalline graphene is limited by high resistance grain boundaries. We demonstrate that a composite based on polycrystalline graphene and a subpercolating network of metallic nanowires offers a simple and effective route to reduced resistance while maintaining high transmittance. This new approach of "percolation-doping by nanowires" has the potential to beat the transparency-conductivity constraints of existing materials and may be suitable for broad applications in photovoltaics, flexible electronics, and displays.
传统的透明导电材料，如 ITO，昂贵、易碎且不灵活。尽管已经提出了碳纳米管网络、多晶石墨烯和金属纳米线等替代品，但这些材料的透明度-导电性折衷使得它们不适合广泛的应用。在本文中，我们表明多晶石墨烯的导电性受到高电阻晶界的限制。我们证明，基于多晶石墨烯和亚渗流金属纳米线网络的复合材料提供了一种简单有效的降低电阻的方法，同时保持高透光率。这种“纳米线渗流掺杂”的新方法有可能克服现有材料的透明度-导电性限制，并且可能适用于光伏、柔性电子和显示器等广泛的应用。
