最近，Nature在同一期上出现了两篇关于制备石墨烯带（Graphene Nanoribbons）的文章，并作为了封面文章，在News And Views进行了评述：

第一篇文章（The FIrst Article）：

    Graphene, or single-layered graphite, with its high crystallinity and interesting semimetal electronic properties, has emerged as an exciting two-dimensional material showing great promise for the fabrication of nanoscale devices^{1, 2, 3}. Thin, elongated strips of graphene that possess straight edges, termed graphene ribbons, gradually transform from semiconductors to semimetals as their width increases^{4, 5, 6, 7}, and represent a particularly versatile variety of graphene. Several lithographic^{7, 8}, chemical^{9, 10, 11} and synthetic¹² procedures are known to produce microscopic samples of graphene nanoribbons, and one chemical vapour deposition process¹³ has successfully produced macroscopic quantities of nanoribbons at 950 °C. Here we describe a simple solution-based oxidative process for producing a nearly 100% yield of nanoribbon structures by lengthwise cutting and unravelling of multiwalled carbon nanotube (MWCNT) side walls. Although oxidative shortening of MWCNTs has previously been achieved¹⁴, lengthwise cutting is hitherto unreported. Ribbon structures with high water solubility are obtained. Subsequent chemical reduction of the nanoribbons from MWCNTs results in restoration of electrical conductivity. These early results affording nanoribbons could eventually lead to applications in fields of electronics and composite materials where bulk quantities of nanoribbons are required^{15, 16, 17}.

第二篇文章（The Second Article）：

    http://www.nature.com/nature/journal/v458/n7240/abs/nature07919.html
    Graphene nanoribbons (GNRs) are materials with properties distinct from those of other carbon allotropes^{1, 2, 3, 4, 5}. The all-semiconducting nature of sub-10-nm GNRs could bypass the problem of the extreme chirality dependence of the metal or semiconductor nature of carbon nanotubes (CNTs) in future electronics^{1, 2}. Currently, making GNRs using lithographic^{3, 4, 6}, chemical^{7, 8, 9} or sonochemical¹ methods is challenging. It is difficult to obtain GNRs with smooth edges and controllable widths at high yields. Here we show an approach to making GNRs by unzipping multiwalled carbon nanotubes by plasma etching of nanotubes partly embedded in a polymer film. The GNRs have smooth edges and a narrow width distribution (10–20 nm). Raman spectroscopy and electrical transport measurements reveal the high quality of the GNRs. Unzipping CNTs with well-defined structures in an array will allow the production of GNRs with controlled widths, edge structures, placement and alignment in a scalable fashion for device integration.


转载本文请联系原作者获取授权，同时请注明本文来自刘洪涛科学网博客。
链接地址：https://m.sciencenet.cn/blog-41603-226981.html

上一篇：选择了这条路，就风雨兼程！
下一篇：Idea 来自哪里？