金表面自组装单层膜的自上而下重组(111)。

IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Steven Kolaczkowski, Gregory S Girolami, Joseph W Lyding
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引用次数: 0

摘要

控制石墨烯带隙最有前途的策略之一是由芳基卤化物前体自下而上合成石墨烯纳米带。这种合成方法形成了具有明确宽度和原子精确边缘的纳米带,这是确保带隙均匀性所必需的。然而,无论是基于表面的还是基于溶液的石墨烯纳米带合成技术,都没有充分解决位置控制问题,而位置控制对石墨烯纳米带晶体管的制造至关重要。为了更好地理解这一问题,我们研究了7A-GNR单体前体10,10'-二溴-9,9'-双蒽(DBBA)的表面有序性。扫描隧道显微镜成像显示DBBA分子自发地在Au(111)上组装成非共价的二维岛屿。通过改变沉积期间和沉积后的样品温度,我们观察到三种不同的吸附质排列。这些二维填料结构对局部激励表现出不同的响应。填料结构的差异及其各自对机电干扰的响应可以让我们深入了解如何优化局部控制和大规模热GNR聚合物生长的最佳条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Top-down reorganization of self-assembled monolayers on Au(111).

Bottom-up synthesis of graphene nanoribbons (GNRs) from aryl halide precursors is often performed thermally or in-solution, without detailing the local molecular assembly or the precursor's response to electromechanics perturbation. This synthetic approach forms nanoribbons with well-defined widths and atomically precise edges, which are necessary for ensuring bandgap uniformity. However, neither on-surface nor solution-based GNR synthesis techniques adequately address the problem of positional control, which is crucial to the fabrication of GNR transistors. To better understand this issue, we investigate the on-surface ordering of 10, 10'-dibromo-9, 9'-bianthracene (DBBA), the 7A-GNR monomer precursor. Scanning tunneling microscopy imaging shows that DBBA molecules spontaneously assemble on Au(111) into non-covalent two-dimensional islands. By varying sample temperature during and after deposition, we observe three different adsorbate arrangements. These two-dimensional packing structures demonstrate differing responses to localized excitations. The difference in packing structures and their respective responses to electro-mechanical perturbations can give us insight into how to best optimize conditions for locally controlled and large-scale thermal GNR polymer growth.

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来源期刊
Nanotechnology
Nanotechnology 工程技术-材料科学:综合
CiteScore
7.10
自引率
5.70%
发文量
820
审稿时长
2.5 months
期刊介绍: The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.
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