Ionic Liquid Based Approach for Single-Molecule Electronics with Cobalt Contacts

被引:17
作者
Catarelli, Samantha R. [1 ]
Higgins, Simon J. [1 ]
Schwarzacher, Walther [2 ]
Mao, Bing-Wei [3 ,4 ]
Yan, Jia-Wei [3 ,4 ]
Nichols, Richard J. [1 ]
机构
[1] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England
[2] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[3] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Fujian, Peoples R China
[4] Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Fujian, Peoples R China
基金
中国国家自然科学基金; 英国工程与自然科学研究理事会;
关键词
SELF-ASSEMBLED MONOLAYERS; ELECTRICAL CONDUCTANCE; N-DODECANETHIOL; JUNCTIONS; TRANSPORT; DEPENDENCE; SURFACES; IMPACT; CHAIN; STM;
D O I
10.1021/la503077c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:14329 / 14336
页数:8
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