• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Solid State Communications >Optical and transport studies of single molecule tunnel junctions based on self-assembled monolayers
【24h】

Optical and transport studies of single molecule tunnel junctions based on self-assembled monolayers

机译：基于自组装单分子层的单分子隧道结的光学和输运研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have fabricated a variety of novel Molecular tunnel junctions based on self-assembled-monolayers (SAM) of two-component solid-state mixtures of molecular wires (1,4-methane benzene-dithiol; Me-BDT with two thiol anchoring groups), and molecular insulator spacers (1-pentanethiol; PT with one thiol anchoring group) at different concentration ratios, r of wires/spacers, which were sandwiched between two metallic electrodes such as gold and cobalt. FTIR spectroscopy and surface titration were used, respectively, to verify the formation of covalent bonds with the electrodes, and obtain the number of active molecular wires in the device. The electrical transport properties of the SAM devices were studied as a function of (i) r-value, (ii) temperatures, and (iii) different electrodes, via the conductance and differential conductance spectra. The measurements were used to analyze the Me-BDT density of states near the electrode Fermi level, and the properties of the interface barriers. We measured the Me-BDT single molecule resistance at low bias and gold electrodes to be 6 x 10(9) Omega. We also determine the energy difference, (Delta) between the Me-BDT HOMO level and the gold Fermi level to be about 1.8 eV. In addition we also found that the temperature dependence of the SAM devices with r < 10(-4) is much weaker than that of the pure PT device (or r = 0), showing a small interface barrier. (C) 2005 Elsevier Ltd. All rights reserved.
机译：我们基于分子线的两组分固态混合物的自组装单分子层（SAM）制备了各种新型分子隧道结（1,4-甲烷苯-二硫醇;具有两个硫醇锚定基团的Me-BDT） ，以及分子绝缘子间隔物（1-戊硫醇；具有一个硫醇锚定基团的PT）以不同的浓度比，金属丝/间隔物r夹在两个金属电极（例如金和钴）之间。分别使用FTIR光谱和表面滴定法来验证与电极的共价键的形成，并获得设备中活性分子线的数量。通过电导和微分电导谱，研究了SAM器件的电传输特性与（i）r值，（ii）温度和（iii）不同电极的关系。这些测量值用于分析电极费米能级附近的状态的Me-BDT密度以及界面势垒的性质。我们在低偏压和金电极下测得的Me-BDT单分子电阻为6 x 10（9）Ω。我们还确定Me-BDT HOMO能级和金费米能级之间的能量差（Δ）约为1.8 eV。此外，我们还发现，r <10（-4）的SAM设备的温度依赖性比纯PT设备（或r = 0）的温度依赖性弱得多，显示出较小的界面势垒。 （C）2005 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号