Ionic liquid based approach for single-molecule electronics with cobalt contacts.
Ionic liquid based approach for single-molecule electronics with cobalt contacts.
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DOI：
10.1021/la503077c
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Samantha R Catarelli;S. Higgins;W. Schwarzacher;B. Mao;Jiawei Yan;R. Nichols
中科院分区：
文献类型：
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作者：
Samantha R Catarelli;S. Higgins;W. Schwarzacher;B. Mao;Jiawei Yan;R. Nichols
提出了一种制备用于单分子电输运测量的钴薄膜的电化学方法。这些膜在水性电解质中电镀，但是在电化学控制下电化学还原以去除表面氧化物和吸附烷（二）硫醇目标分子以形成保护无氧化物的钴表面的自组装单层的关键阶段在离子液体中进行。这种方法产生的单分子膜上的钴是可比的质量上形成的Au通过标准的自组装协议，通过电化学方法和表面红外光谱法进行评估。使用一个适应的扫描隧道显微镜（STM）的方法，我们已经确定了单分子电导的钴/1，8-辛二硫醇/钴结采用单层钴和钴STM尖端在离子液体环境中，并与使用金电极作为对照的实验结果进行了比较。因此，这些钴衬底可以在有机自旋电子器件，如磁性隧道结的未来应用。
An electrochemical method is presented for fabricating cobalt thin films for single-molecule electrical transport measurements. These films are electroplated in an aqueous electrolyte, but the crucial stages of electrochemical reduction to remove surface oxide and adsorption of alkane(di)thiol target molecules under electrochemical control to form self-assembled monolayers which protect the oxide-free cobalt surface are carried out in an ionic liquid. This approach yields monolayers on Co that are of comparable quality to those formed on Au by standard self-assembly protocols, as assessed by electrochemical methods and surface infrared spectroscopy. Using an adapted scanning tunneling microscopy (STM) method, we have determined the single-molecule conductance of cobalt/1,8-octanedithiol/cobalt junctions by employing a monolayer on cobalt and a cobalt STM tip in an ionic liquid environment and have compared the results with those of experiments using gold electrodes as a control. These cobalt substrates could therefore have future application in organic spintronic devices such as magnetic tunnel junctions.