Measurement of single-molecular conductivity

单分子电导率的测量

• 批准号: 13450023
• 负责人: MATSUMOTO Takuya
• 金额: $ 8.96万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450023/
• 关键词: Conductivity of single molecule; Non-contact atomic force microscopy; Scanning tunneling microscopy; Point-contact current-imaging atomic force microscopy; Charge transfer microscopy; Carbon nano-tube; Porphyrin array; DNA; 電荷移動; レベルシフト; スタック角度

Molecular electronics has attracted much attention in the last quarter-century. Investigations on the electronic properties and functions of molecular systems have made remarkable advances since the invention of scanning tunneling microscopy (STM). However, STM measurement is inadequate for the device structure consisting of conductive and insulating parts due to the requirement of conductivity for all over the scanning area. In this study, novel methods of scanning probe microscopy based on atomic force microscopy (AFM). These methods enable us to evaluate electronic properties of molecular nanostructures located on insulating substrates and/or connected with metal electrodes.1.Non-contact atomic force microscopy (NC-AFM) has been employed to observe double-stranded DNA. The simultaneous measurements of frequency-shift and tunneling current indicate that DNA molecules show tunneling conductivity with the. attenuation factor β=1.1Å^<-1>.2.Point-contact current-imaging atomic force micr … More oscopy (PCI-AFM) enables us to obtain topographic images and current-voltage characteristics simultaneously in nanoscale. PCI-AFM is a combined method with two different measurement techniques : tapping-mode scan and point-contact measurement. This new technique will be a good approach to obtain the relationship between topography and electrical properties of individual nanoscale structures.3.Charge transfer force microscopy/ spectroscopy (CTFM/S) detects the energy dissipation of cantilever oscillation with constant tip-sample distance under bias voltage. It enables us to obtain a map of density of states (DOS) and DOS spectra in manometer-scale resolution for the surface consisting of insulating and conductive parts. CTFM images and CTFS spectra are obtained by probing frequency shift of cantilever oscillation. Figure 1 shows CTFS spectra as a function of bias voltage for 5, 10, 15, 20-tetraphenyl-21H, 23H-porphine tetrasulfonic acid (TPPS). HOMO-LUMO gap (1.7eV) is observed clearly on an insulating substrate. Less

分子电子在上四分之一世纪引起了很多关注。自扫描隧道显微镜（STM）发明以来，对分子系统电子性质和功能的研究已取得了显着的进步。然而，由于需要在整个扫描区域对电导率的电导率，该设备结构的STM测量不足。在这项研究中，基于原子力显微镜（AFM）的扫描探针显微镜的新方法。这些方法使我们能够评估位于绝缘底物上的分子纳米结构和与金属电子连接的分子纳米结构的电子性能。1。non-contact原子力显微镜（NC-AFM）已被用来观察到双链DNA。频移和隧穿电流的同时测量表明DNA分子显示了与该分子的隧道电导率。衰减因子β=1.1Å^<-1> .2。点接触电流成像原子力微型…更多的示波器（PCI-AFM）使我们能够仅在纳米级中获得地形图像和电流 - 电压特性。 PCI-AFM是一种具有两种不同测量技术的组合方法：敲击模式扫描和点接触测量。这项新技术将是获得单个纳米级结构的地形和电气性能之间关系的好方法。3.Charge转移力显微镜/光谱（CTFM/ S）检测到悬臂振荡的能量耗散，并在偏置电压下恒定尖端样本距离。它使我们能够在压力计尺度分辨率中获得状态密度（DOS）和DOS光谱的图，该表面由绝缘和导电部件组成。 CTFM图像和CTFS光谱是通过探测悬臂振荡的频移获得的。图1显示了5、10、15、20-四苯基-21H，23H-卟啉四磺酸（TPPS）的CTFS光谱作为偏置电压的函数。在绝缘底物上清楚地观察到了同性lumo间隙（1.7EV）。较少的

项目成果

Katsunori Tagami, Takuya Matsumoto, Tomoji Kawai, Tasaru Tsukada: "Theoretical prescriptions for improving conductance of short DNA segments sandwiched between metal electrode"Jpn.J.Appl.Phys.. 42. 5887 (2003)

Katsunori Tagami、Takuy​​a Matsumoto、Tomoji Kawai、Tasaru Tsukada：“改善夹在金属电极之间的短 DNA 片段电导的理论处方”Jpn.J.Appl.Phys.. 42. 5887 (2003)

T.Matsumoto, T.Yokoyama, T.Kawai: "Chemistry of Nanomolecular systems-towards the realization of nanomolecular devices"Springer-Verlag. 107-121 (2002)

T.Matsumoto、T.Yokoyama、T.Kawai：“纳米分子系统的化学——迈向纳米分子器件的实现”施普林格出版社。

Yasushi Maeda, Hidehiro Nishijima, Seiji Akita, Takuya Matsumoto, Yoshikazu Nakayama, Tomoji Kawai: "Reduction of Long-range Interaction using Carbon Nanotube Probes in Biological Systems."Jpn.J.Appl.Phys.. 40. 1425-1428 (2001)

Yasushi Maeda、Hidehiro Nishijima、Seiji Akita、Takuy​​a Matsumoto、Yoshikazu Nakayama、Tomoji Kawai：“在生物系统中使用碳纳米管探针减少长程相互作用。”Jpn.J.Appl.Phys.. 40. 1425-1428 (2001)

Katsunori Tagami, Masaru Tsukada, Takuya Matsumoto, Tomoji Kawai: "Electronic transport properties of free-base tape-porphyrin molecular wires studied by self-consistent tight-binding calculations."Phys.Rev.B. 67. 245324(1)-245324(7) (2003)

Katsunori Tagami、Masaru Tsukada、Takuy​​a Matsumoto、Tomoji Kawai：“通过自洽紧束缚计算研究游离碱带-卟啉分子线的电子输运特性。”Phys.Rev.B。

Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai: "A Nano tester : A new technique for nanoscale electrical characterization by point-contact current-imaging atomic force microscopy"Jpn.J.Appl.Phys.(2002). 41. L742-L744 (2002)

Yoichi Otsuka、Yasuhisa Naitoh、Takuy​​a Matsumoto、Tomoji Kawai：“纳米测试仪：通过点接触电流成像原子力显微镜进行纳米级电气表征的新技术”Jpn.J.Appl.Phys.(2002)。