Carbazole-Based Tetrapodal Anchor Groups for Gold Surfaces: Synthesis and Conductance Properties
Carbazole-Based Tetrapodal Anchor Groups for Gold Surfaces: Synthesis and Conductance Properties
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DOI：
10.1002/anie.201911652
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发表时间：
2019-11-27
影响因子：
16.6
通讯作者：
Bryce, Martin R.
中科院分区：
文献类型：
--
作者：
O'Driscoll, Luke J.;Wang, Xintai;Bryce, Martin R.
随着分子尺度电子学领域的成熟和包含分子线的器件的前景变得更加可行，有必要从基本电导研究中使用的简单锚基发展到考虑到器件稳定性的更精细的锚基设计。这项研究提出了一系列的低聚(苯乙炔)丝与一个四足锚和一个苯基或吡啶头基。新的锚被设计成在不破坏导线的导电路径的情况下与金表面牢固地结合。用导电探针原子力显微镜(CAFM)测量了Au-SAM-铂和Au-SAM-石墨烯结中金属丝自组装单分子层(SAM)的电导，并由此计算出每个分子的电导。对于甲烷型导线，测量了高达10(-4.37)G(0)(铂)和10(-3.78)G(0)(石墨烯)的每个分子的平均电导，尽管与金电极的电子耦合有限，证明了这种方法的潜力。表面结合几何和输运性质的计算研究合理并支持了实验结果。
As the field of molecular-scale electronics matures and the prospect of devices incorporating molecular wires becomes more feasible, it is necessary to progress from the simple anchor groups used in fundamental conductance studies to more elaborate anchors designed with device stability in mind. This study presents a series of oligo(phenylene-ethynylene) wires with one tetrapodal anchor and a phenyl or pyridyl head group. The new anchors are designed to bind strongly to gold surfaces without disrupting the conductance pathway of the wires. Conductive probe atomic force microscopy (cAFM) was used to determine the conductance of self-assembled monolayers (SAMs) of the wires in Au-SAM-Pt and Au-SAM-graphene junctions, from which the conductance per molecule was derived. For tolane-type wires, mean conductances per molecule of up to 10(-4.37) G(0) (Pt) and 10(-3.78) G(0) (graphene) were measured, despite limited electronic coupling to the Au electrode, demonstrating the potential of this approach. Computational studies of the surface binding geometry and transport properties rationalise and support the experimental results.