Odd–Even Effects in Charge Transport acrossn-Alkanethiolate-Based SAMs,Journal of the American Chemical Society

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Odd–Even Effects in Charge Transport acrossn-Alkanethiolate-Based SAMs
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2014-11-20 , DOI: 10.1021/ja509436k
Mostafa Baghbanzadeh ₁ , Felice C. Simeone ₁ , Carleen M. Bowers ₁ , Kung-Ching Liao ₁ , Martin Thuo ₁ , Mahdi Baghbanzadeh ₂ , Michael S. Miller ₃ , Tricia Breen Carmichael ₃ , George M. Whitesides _{1,

4}

Affiliation

This paper compares rates of charge transport across self-assembled monolayers (SAMs) of n-alkanethiolates having odd and even numbers of carbon atoms (nodd and neven) using junctions with the structure M(TS)/SAM//Ga2O3/EGaIn (M = Au or Ag). Measurements of current density, J(V), across SAMs of n-alkanethiolates on Au(TS) and Ag(TS) demonstrated a statistically significant odd-even effect on Au(TS), but not on Ag(TS), that could be detected using this technique. Statistical analysis showed the values of tunneling current density across SAMs of n-alkanethiolates on Au(TS) with nodd and neven belonging to two separate sets, and while there is a significant difference between the values of injection current density, J0, for these two series (log|J0Au,even| = 4.0 ± 0.3 and log|J0Au,odd| = 4.5 ± 0.3), the values of tunneling decay constant, β, for nodd and neven alkyl chains are indistinguishable (βAu,even = 0.73 ± 0.02 Å(-1), and βAu,odd= 0.74 ± 0.02 Å(-1)). A comparison of electrical characteristics across junctions of n-alkanethiolate SAMs on gold and silver electrodes yields indistinguishable values of β and J0 and indicates that a change that substantially alters the tilt angle of the alkyl chain (and, therefore, the thickness of the SAM) has no influence on the injection current density across SAMs of n-alkanethiolates.

中文翻译：

基于烷硫醇的 SAM 中电荷传输的奇偶效应

本文使用结构为 M(TS)/SAM//Ga2O3/EGaIn (M = 金或银）。对 Au(TS) 和 Ag(TS) 上的正链烷硫醇的 SAM 的电流密度 J(V) 的测量表明对 Au(TS) 有统计上显着的奇偶效应，但对 Ag(TS) 没有，这可以使用该技术进行检测。统计分析表明，nodd 和 neven 在 Au(TS) 上 n-alkanethiolates SAMs 的隧道电流密度值属于两个不同的组，虽然这两者的注入电流密度值 J0 之间存在显着差异系列 (log|J0Au,even| = 4.0 ± 0.3 和 log|J0Au,odd| = 4.5 ± 0.3)，隧道衰减常数 β 的值，对于 nodd 和 neven 烷基链是无法区分的（βAu,even = 0.73 ± 0.02 Å(-1)，和 βAu,odd= 0.74 ± 0.02 Å(-1)）。金和银电极上正链烷硫醇 SAM 连接点的电气特性比较产生无法区分的 β 和 J0 值，并表明这种变化会显着改变烷基链的倾斜角（因此，SAM 的厚度）对正链烷硫醇的 SAM 中的注入电流密度没有影响。

更新日期：2014-11-20

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