Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA.
Department of Mechanical & Aerospace Engineering, University of California, San Diego, La Jolla, CA, 92093, USA.
Small. 2015 Jul;11(26):3143-52. doi: 10.1002/smll.201402784. Epub 2015 Mar 31.
Graphene has received appreciable attention for its potential applications in flexible conducting film due to its exceptional optical, mechanical, and electrical properties. However increasing transmittance of graphene without sacrificing the electrical conductivity has been difficult. The fabrication of optically highly transparent (≈98%) graphene layer with a reasonable electrical conductivity is demonstrated here by nanopatterning and doping. Anodized aluminium oxide nanomask prepared by facile and simple self-assembly technique is utilized to produce an essentially hexagonally nanopatterned graphene. The electrical resistance of the graphene increases significantly by a factor of ≈15 by removal of substantial graphene regions via nanopatterning into hexagonal array pores. However, the use of chemical doping on the nanopatterned graphene almost completely recovers the lost electrical conductivity, thus leading to a desirably much more optically transparent conductor having ≈6.9 times reduced light blockage by graphene material without much loss of electrical conductivity. It is likely that the availability of large number of edges created in the nanopatterned graphene provides ideal sites for chemical dopant attachment, leading to a significant reduction of the sheet resistance. The results indicate that the nanopatterned graphene approach can be a promising route for simultaneously tuning the optical and electrical properties of graphene to make it more light-transmissible and suitable as a flexible transparent conductor.
由于其出色的光学、机械和电学性能，石墨烯在柔性导电薄膜中的潜在应用引起了相当大的关注。然而，在不牺牲电导率的情况下提高石墨烯的透光率一直很困难。本文通过纳米图案化和掺杂，展示了具有合理电导率的高透光率（≈98%）石墨烯层的制造。通过简便的自组装技术制备的阳极氧化铝纳米掩模，用于生产基本上呈六边形纳米图案化的石墨烯。通过将大量石墨烯区域通过纳米图案化为六边形阵列孔去除，石墨烯的电阻显著增加了约 15 倍。然而，在纳米图案化的石墨烯上进行化学掺杂几乎完全恢复了失去的电导率，从而得到了一种理想的、更透明的导体，其光阻挡率降低了约 6.9 倍，而电导率损失很小。在纳米图案化的石墨烯中，可能存在大量边缘，这些边缘为化学掺杂剂的附着提供了理想的位置，从而显著降低了薄片电阻。结果表明，纳米图案化石墨烯方法可能是同时调整石墨烯的光学和电学性能的一种有前途的途径，使其更透光并适合作为柔性透明导体。
