Controlling Formation of Single-Molecule Junctions by Electrochemical Reduction of Diazonium Terminal Groups

被引:73
作者
Hines, Thomas [1 ,2 ]
Diez-Perez, Ismael [3 ,4 ]
Nakamura, Hisao [6 ]
Shimazaki, Tomomi [5 ]
Asai, Yoshihiro [6 ]
Tao, Nongjian [1 ,2 ]
机构
[1] Arizona State Univ, Ctr Biosensors & Bioelect, Biodesign Inst, Tempe, AZ 85287 USA
[2] Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ 85287 USA
[3] Univ Barcelona, Dept Phys Chem, E-08028 Barcelona, Spain
[4] Inst Bioengn Catalonia, Barcelona 08028, Spain
[5] RIKEN, Adv Inst Computat Sci, Chuo Ku, Kobe, Hyogo 6500047, Japan
[6] Natl Inst Adv Ind Sci & Technol, Nanosyst Res Inst RICS, Tsukuba, Ibaraki 3058568, Japan
基金
美国国家科学基金会;
关键词
ELECTRON-TRANSPORT; ANCHORING GROUPS; CARBON SURFACES; CONDUCTANCE; SPECTROSCOPY; GOLD; AU;
D O I
10.1021/ja3106434
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report controlling the formation of single-molecule junctions by means of electrochemically reducing two axialdiazonium terminal groups on a molecule, thereby producing direct Au-C covalent bonds in situ between the molecule and gold electrodes. We report a yield enhancement in molecular junction formation as the electrochemical potential of both junction electrodes approach the reduction potential of the diazonium terminal groups. Step length analysis shows that the molecular junction is significantly more stable, and can be pulled over a longer distance than a comparable junction created with amine anchoring bonds. The stability of the junction is explained by the calculated lower binding energy associated with the direct Au-C bond compared with the Au-N bond.
引用
收藏
页码:3319 / 3322
页数:4
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