1] State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
Nat Commun. 2013;4:2920. doi: 10.1038/ncomms3920.
Graphene, exhibiting superior mechanical, thermal, optical and electronic properties, has attracted great interest. Considering it being one-atom-thick, and the reduced mechanical strength at grain boundaries, the fabrication of large-area suspended chemical vapour deposition graphene remains a challenge. Here we report the fabrication of an ultra-thin free-standing carbon nanotube/graphene hybrid film, inspired by the vein-membrane structure found in nature. Such a square-centimetre-sized hybrid film can realize the overlaying of large-area single-layer chemical vapour deposition graphene on to a porous vein-like carbon nanotube network. The vein-membrane-like hybrid film, with graphene suspended on the carbon nanotube meshes, possesses excellent mechanical performance, optical transparency and good electrical conductivity. The ultra-thin hybrid film features an electron transparency close to 90%, which makes it an ideal gate electrode in vacuum electronics and a high-performance sample support in transmission electron microscopy.
石墨烯具有优异的机械、热、光和电子性能，引起了极大的兴趣。考虑到它只有一个原子厚，而且在晶界处的机械强度降低，因此制造大面积悬空的化学气相沉积石墨烯仍然是一个挑战。在这里，我们受自然界中叶脉-薄膜结构的启发，报告了一种超薄的独立式碳纳米管/石墨烯杂化薄膜的制造方法。这种大小为一平方厘米的杂化薄膜可以实现大面积单层化学气相沉积石墨烯在多孔叶脉状碳纳米管网络上的覆盖。这种叶脉-薄膜状的杂化薄膜，将石墨烯悬空在碳纳米管网格上，具有优异的机械性能、光学透明度和良好的导电性。这种超薄的杂化薄膜具有接近 90%的电子透明度，使其成为真空电子学中理想的栅极电极，以及透射电子显微镜中高性能的样品支撑。
