Fabrication of Large-Area and Large-Bandgap Semiconducting Graphene Materials

该项目的首要目标是学习如何通过自上而下的纳米图案化和纳米制造方法在石墨烯中开辟技术相关的带隙，这些方法可以扩展到大面积。 我们的具体目标是：（1）定制和减少纳米图案的大小和形状，以实现更大的带隙0.5 eV;（2）学习如何缩放到~ 5x 5 cm 2或更大？威化饼？半导体石墨烯;（3）控制石墨烯边缘的原子功能化，其随着特征尺寸的减小而变得越来越重要;以及（4）展示半导体石墨烯电子器件的晶片宽阵列的原理证明。 我们以可扩展的方式纳米制造大带隙石墨烯的方法将采用自导向光刻模板。 模板将基于嵌段共聚物和小分子，这些分子将被定制为在石墨烯上以前所未有的图案化分辨率自组装，并将与受控的自上而下的图案化结合使用，以控制石墨烯的电子行为。更广泛的意义和重要性：石墨烯由于其特殊的电子，光学，机械和热性能最近受到了极大的关注。 虽然未图案化的石墨烯不是半导体，但纳米图案化的石墨烯表现得像半导体，这意味着它的导电性可以切换？开着？然后呢？关闭？ 这激发了半导体石墨烯在电子学，红外光电子学和光子学，生物传感和太阳能收集方面的兴奋，希望利用石墨烯？为这些应用程序的特殊属性。 拟议中的研究将达到高潮，在新的纳米制造工艺，这将使大面积的制造？威化饼？技术上相关的半导体石墨烯。 半导体石墨烯？威化饼？将成为变革性的强大材料平台，用于推出基于碳纳米技术的广泛的下一代应用。 主要研究人员还将指导本科生和代表性不足的学生进行研究，并参加威斯康星大学麦迪逊分校的一门课程，该课程旨在让板凳科学家和科学传播者开发和使用有效的策略，与公众沟通科学和技术，特别是关于纳米技术。

The overarching goal of this project is to learn how to open up a technologically relevant bandgap in graphene via top-down nanopatterning and nanomanufacturing approaches that can be scaled to large-areas. Our specific objectives are to: (1) tailor and reduce nanopattern- size and shape to achieve larger bandgaps 0.5 eV; (2) learn how to scale to ~5x5 cm2 or larger ?wafers? of semiconducting graphene; (3) control the atomic functionalization of graphene edges which become increasingly important as feature-size is reduced; and (4) demonstrate proof-of-principal wafer-wide arrays of semiconducting graphene electronic devices. Our approach for nanomanufacturing large bandgap graphene in a scalable fashion will be to employ self-directed lithographic templates. The templates will be based on block copolymers and small molecules that will be tailored to self-assemble on graphene with unprecedented patterning resolution and will be used in conjunction with controlled top-down patterning to control the electronic behaviors of graphene. Broader significant and importance: Graphene has received substantial attention recently because of its exceptional electronic, optical, mechanical, and thermal properties. While unpatterned graphene is not a semiconductor, nanopatterned graphene acts like one, meaning that its electrical conductivity can be switched ?ON? and ?OFF?. This has spurred excitement for semiconducting graphene in electronics, infrared optoelectronics and photonics, biosensing, and solar energy harvesting in hopes of exploiting graphene?s exceptional properties for these applications. The proposed research will culminate in novel nanomanufacturing processes that will enable the fabrication of large-area ?wafers? of technologically relevant semiconducting graphene. The semiconducting graphene ?wafers? will be transformative and powerful materials platforms for launching a wide range of next-generation applications based on carbon nanotechnology. The principal investigators will also mentor undergraduate and under-represented students in research and participate in a course at UW-Madison designed to allow bench scientists and science communicators to develop and use effective strategies for communicating with the general public about science and technology, particularly about nanotechnology.