Planar aromatic anchors control the electrical conductance of gold|molecule|graphene junctions.
Planar aromatic anchors control the electrical conductance of gold|molecule|graphene junctions.
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DOI：
10.1039/d2na00873d
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发表时间：
2023-04-11
影响因子：
4.7
通讯作者：
Lambert, Colin J.
中科院分区：
文献类型：
--
作者：
O'Driscoll, Luke J.;Jay, Michael;Robinson, Benjamin J.;Sadeghi, Hatef;Wang, Xintai;Penhale-Jones, Becky;Bryce, Martin R.;Lambert, Colin J.
报道了具有平面芳香族头部基团的烷基乙氧基化物分子家族的合成，所述烷基乙氧基化物分子被设计成有效地将分子锚到石墨烯电极。通过导电原子力显微镜在金表面上的这些分子的自组装单层的表征表明，当存在芳香族头基时，使用石墨烯涂覆的探针获得的电导Ggraphene高于使用铂（Pt）探针获得的电导GPt。对于Pt探针和石墨烯探针结，具有烷乙氧基分子骨架的苄醚衍生物的隧穿衰减常数分别确定为β = 5.6 nm−1和3.5 nm−1。电导率比Ggraphene/GPt随着芳香族头部单元中存在的环的数目n的增加而增加。然而，随着环的数量增加，电导路径长度增加，因为平面头部组与电极平面成一定角度。这意味着总电导随着n的增加而减小。基于密度泛函理论的电荷输运计算支持这些实验结果。该研究证实了平面芳香族头部基团可以作为石墨烯电极在大面积分子结中的有效锚定单元。然而，结果也表明，这些头部基团的大小和几何形状必须加以考虑，以产生有效的分子设计。合成了具有平面芳香族头部基团的烷硫醇分子，并将其组装在金表面上。使用带有Pt和石墨烯涂层尖端的导电原子力显微镜测量所得单层的电导特性。
The synthesis of a family of alkanethiol molecules with planar aromatic head groups, designed to anchor molecules effectively to graphene electrodes, is reported. Characterisation of self-assembled monolayers of these molecules on a gold surface via conductive atomic force microscopy shows that when an aromatic head group is present, the conductance Ggraphene obtained using a graphene coated probe is higher than the conductance GPt obtained using a platinum (Pt) probe. For Pt probe and graphene probe junctions, the tunnelling decay constant of benzyl ether derivatives with an alkanethiol molecular backbone is determined as β = 5.6 nm−1 and 3.5 nm−1, respectively. The conductance ratio Ggraphene/GPt increases as the number of rings present in the aromatic head unit, n, increases. However, as the number of rings increases, the conductance path length increases because the planar head groups lie at an angle to the plane of the electrodes. This means that overall conductance decreases as n increases. Density functional theory-based charge transport calculations support these experimental findings. This study confirms that planar aromatic head groups can function as effective anchoring units for graphene electrodes in large area molecular junctions. However, the results also indicate that the size and geometry of these head groups must be considered in order to produce effective molecular designs. Alkanethiol molecules with planar aromatic head groups were synthesised and assembled on gold surfaces. The conductance properties of the resulting monolayers were measured using conductive atomic force microscopy with Pt and graphene coated tips.
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影响因子：
17.1
作者：
Gehring P;Sowa JK;Cremers J;Wu Q;Sadeghi H;Sheng Y;Warner JH;Lambert CJ;Briggs GAD;Mol JA
通讯作者：
Mol JA
影响因子：
15
作者：
Engelkes, VB;Beebe, JM;Frisbie, CD
通讯作者：
Frisbie, CD
影响因子：
16.6
作者：
Arroyo, Carlos R.;Tarkuc, Simge;van der Zant, Herre S. J.
通讯作者：
van der Zant, Herre S. J.
影响因子：
6.7
作者：
Grace, Iain M.;Olsen, Gunnar;Lambert, Colin J.
通讯作者：
Lambert, Colin J.
影响因子：
4.4
作者：
Bailey, Steven;Visontai, David;Chappell, David
通讯作者：
Chappell, David