Electron transport in self-assembled polymer molecular junctions
Electron transport in self-assembled polymer molecular junctions
复制标题
自组装聚合物分子结中的电子传输
DOI：
10.1103/physrevlett.96.027801
复制
发表时间：
2006-01-20
影响因子：
8.6
通讯作者：
Torimitsu, K
中科院分区：
文献类型：
--
作者：
Hu, WP;Jiang, J;Torimitsu, K
利用自组装技术制备了一种末端含硫代乙酸酯基的聚对苯撑乙炔衍生物（TA-PPE）分子结。利用电镀技术制备的纳米间隙电极对TA-PPE分子的巯基进行偶联。室温下的分子结的电流-电压特性表现出高度的周期性，可重复性，和相同的阶梯功能。第一性原理计算表明，等距台阶的一种可能性是由于不同导电通道的打开，该通道对应于结中聚合物的未占据分子轨道。有趣的是，18 nm长的聚合物具有量子化的电子结构，并且表现得像量子输运器件。
A molecular junction of a poly(p-phenyleneethynylene)s derivative with thioacetate end groups (TA-PPE) was fabricated by self-assembling. Nanogap electrodes made by electroplating technique was used to couple thiol end groups of TA-PPE molecules. Room temperature current-voltage characteristics of the molecular junction exhibited highly periodic, repeatable, and identical stepwise features. First-principles calculations suggest that one possibility for the equidistant step is due to the opening of different conducting channels that corresponds to the unoccupied molecular orbitals of the polymer in the junction. It is interesting to see that an 18 nm long polymer is of quantized electronic structures and behaves like a quantum transport device.