机械可控纳米劈裂法实现单分子电导值的测量  

Utilization of Mechanically Controllable Break Junction for Single Molecule Conductance Measurement

作　　者：王青玲[1] 袁杰[2] 何开华[3] 陈绮丽[3] 龙光芝[3] 向东[3] 

机构地区：[1]中国地质大学机械与电子信息学院,武汉430074 [2]中国地质大学环境学院,武汉430074 [3]中国地质大学数学与物理学院,武汉430074

出　　处：《纳米技术与精密工程》2013年第4期285-291,共7页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(51102218);中央高校基础研究资助项目(CUGL120220);霍姆赫兹-国家留学基金委联合项目(留金出(2007)3021号)为期3年的经费支持

摘　　要：为了获得电子在单分子结中传输的特性,研制了具有高稳定性的机械可控纳米劈裂装置芯片.利用此芯片及相应机械装置,获得了能在皮米级精度上操纵间距的纳米电极对;并实现了稳定的单个金属离子所桥接的分子结(电极-分子-金属离子-分子-电极).在保持配合物不变的前提下,置换不同金属离子,测量了其所桥接的单分子结的电导值,发现Ca2+络合物的电导值>>Zn2+络合物的电导值>Ni2+络合物的电导值.结合密度泛函理论的计算,验证了所得实验装置的可靠性及实验结果的正确性.In order to investigate the electrical properties of electron transport through the single mole- cule, a chip for the mechanically controllable break junction （MCBJ） was fabricated. With such a chip and corresponding mechanical setup, a pair of nanoelectrodes can be obtained and the distance between the electrodes can be adjusted with pieometer accuracy. The molecular junctions bridged by metal ion （ electrode-molecule-metal ion-molecule-electrode junctions） were established using the technology of me- chanically controllable break junction. The corresponding current-voltage characterization was studied. Furthermore, the influence of different metal ions on complexes conductivity was investigated, while leav- ing the ligands mainly unchanged. The conductance of the junctions depends strongly on the kind of bridged metal ion, and the order is Ca2＋ junction 〉〉 Zn2＋ junction 〉 Ni2＋ junction. Supported by the density functional theory calculation, the reliability of our device and the accuracy of the data were veri- fied.

关 键 词：分子电子 纳米电极 单分子电导 金属离子络合物 机械可控纳米劈裂 

分 类 号：O561[理学—原子与分子物理]