Conductance measurement of carboxylic acids binding to palladium nanoclusters by electrochemical jump-to-contact STM break junction

详细信息    查看全文

• 作者：Ya-Hao Wang ; Xiao-Yi Zhou ; Yan-Yan Sun ; Di Han ; Ju-Fang Zheng ; Zhen-Jiang Niu ; Xiao-Shun Zhou ; ^{xszhou@zjnu.edu.cn" class="auth_mail} ; ^{xszhoustm@gmail.com" class="auth_mail}
• 关键词：Single-molecule junctions ; Electrochemical scanning tunneling microscopy break junction ; Pd ; Alkanedicarboxylic acid ; Electron transport
• 刊名：Electrochimica Acta
• 出版年：20 March, 2014
• 年：2014
• 卷：123
• 期：Complete
• 页码：205-210
• 全文大小：1653 K

文摘

We measured the single-molecule conductance of alkanedicarboxylic acid (HOOC 鈭?#xA0;(CH₂)_n 鈭?#xA0;COOH, n = 1 鈭?#xA0;5) with Pd nanoclusters by electrochemical jump-to-contact STM-break junction. They gave out decay constant 尾_N of 0.652 per (鈭扖H₂) unit and contact conductance of 97 nS. The single-molecule conductance of carboxylic acid binding to bulk metal electrode was also studied, and has almost the same value as that binding to Pd nanoclusters. The conductance study on Pd-oxalic acid junctions shows that the electron transfer through the ultrashort molecular junctions is not only contributed by the 鈥渢hrough-bond鈥?(TB) mechanism but also 鈥渢hrough-space鈥?(TS) mechanism. Our work provides a new path to study the single-molecule conductance with Pd contacts.