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首页> 外文期刊>RSC Advances >Self-assembled monolayers of terminal acetylenes as replacements for thiols in bottom-up tunneling junctions
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Self-assembled monolayers of terminal acetylenes as replacements for thiols in bottom-up tunneling junctions

机译：末端乙炔的自组装单分子层可替代自下而上的隧道结中的硫醇

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摘要

Why use thiols in Molecular Electronics? They stink, oxidize readily, poison catalysts, and often require nontrivial protection/deprotection chemistry. In this communication we demonstrate the fabrication of tunneling junctions formed by contact of self-assembled monolayers (SAMs) of terminal alkynes onto silver and gold substrates. The SAMs form spontaneously upon exposure of the substrates to ethanolic solutions of the alkynes. Characterization by vibrational spectroscopy, XPS, and contact angles shows that the packing of the SAMs is nearly identical to those formed from equivalent thiols. Electrical characterization of the junctions revealed virtually no differences between SAMs on gold and silver, yielding beta(Au) = 1.17 +/- 0.04n(C)(-1), J(0) = (2.836 +/- 0.001) x 10(3) A cm(-2) for Au, and beta(Ag) - 1.23 +/- 0.09n(C)(-1), J(0) = (4.722 +/- 0.002) x 10(3) A cm(-2) for Ag. These values are in excellent agreement with junctions formed from alkanethiols of the same lengths as the alkynes, suggesting that there is no functional difference between thiols and alkynes as anchoring groups for SAMs. Yet alkynes are synthetically versatile, do not poison catalysts, are not odorous, and do not spontaneously oxidize, which are all attractive features for use in Molecular Electronics.
机译：为什么在分子电子学中使用硫醇？它们会发臭，容易氧化，使催化剂中毒，并且经常需要不重要的保护/脱保护化学作用。在此通讯中，我们演示了通过末端炔烃的自组装单层（SAM）与银和金基底接触而形成的隧道结的制造方法。当底物暴露于炔烃的乙醇溶液时，SAM会自发形成。通过振动光谱法，XPS和接触角进行的表征表明，SAM的堆积与等价硫醇形成的堆积几乎相同。结的电特性表明，金和银上的SAM之间几乎没有差异，产生的beta（Au）= 1.17 +/- 0.04n（C）（-1），J（0）=（2.836 +/- 0.001）x 10 （3）Au和beta（Ag）的cm（-2）-1.23 +/- 0.09n（C）（-1），J（0）=（4.722 +/- 0.002）x 10（3）A Ag的cm（-2）。这些值与由与炔烃相同长度的烷硫醇形成的连接极吻合，表明在硫醇和炔烃作为SAM的锚定基团之间没有功能差异。然而，炔烃在合成上具有多种用途，不会毒化催化剂，不会产生异味，并且不会自发氧化，这些都是在分子电子学中使用的诱人特征。

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