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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金表面咔唑基四足锚定基团：合成和电导性能
DOI：
10.1002/ange.201911652
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发表时间：
2019
影响因子：
--
通讯作者：
O'Driscoll L
中科院分区：
文献类型：
--
作者：
O'Driscoll L
随着分子尺度电子学领域的成熟和包含分子导线的器件的前景变得更加可行，有必要从基础电导研究中使用的简单锚基团发展到考虑到器件稳定性而设计的更复杂的锚。本研究提出了一系列低聚（亚苯基-乙炔基）线与一个四足锚和一个苯基或吡啶基头基团。新的锚被设计成牢固地结合到金表面，而不会破坏导线的传导路径。使用导电探针原子力显微镜（cAFM）来确定Au-SAM-Pt和Au-SAM-石墨烯结中的线的自组装单层（SAM）的电导，由此导出每个分子的电导。对于二苯乙炔型导线，尽管与Au电极的电子耦合有限，但测量到的每分子平均电导高达10− 4.37 G 0（Pt）和10− 3.78 G 0（石墨烯），证明了这种方法的潜力。计算研究的表面结合的几何形状和运输性能合理化，并支持实验结果。
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 10−4.37G0(Pt) and 10−3.78G0(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.