Diehl Michael R, Steuerman David W, Tseng Hsian-Rong, Vignon Scott A, Star Alexander, Celestre Paul C, Stoddart J Fraser, Heath James R
Division of Chemistry and Chemical Engineering, California Institute of Technology, M/C 127-72, 1200 East California, Boulevard, Pasadena, CA 91125, USA.
Chemphyschem. 2003 Dec 15;4(12):1335-9. doi: 10.1002/cphc.200300871.
This article describes two-terminal molecular switch tunnel junctions (MSTJs) which incorporate a semiconducting, single-walled carbon nanotube (SWNT) as the bottom electrode. The nanotube interacts noncovalently with a monolayer of bistable, nondegenerate [2]catenane tetracations, self-organized by their supporting amphiphilic dimyristoylphosphatidyl anions which shield the mechanically switchable tetracations from a two-micrometer wide metallic top electrode. The resulting 0.002 micron 2 area tunnel junction addresses a nanometer wide row of approximately 2000 molecules. Active and remnant current-voltage measurements demonstrated that these devices can be reconfigurably switched and repeatedly cycled between high and low current states under ambient conditions. Control compounds, including a degenerate [2]catenane, were explored in support of the mechanical origin of the switching signature. These SWNT-based MSTJs operate like previously reported silicon-based MSTJs, but differently from similar devices incorporating bottom metal electrodes. The relevance of these results with respect to the choice of electrode materials for molecular electronics devices is discussed.
本文描述了双端分子开关隧道结（MSTJs），其将半导体单壁碳纳米管（SWNT）用作底部电极。该纳米管与双稳态、非简并的[2]连环烷四价阳离子单层非共价相互作用，这些阳离子由其支撑的两亲性二肉豆蔻酰磷脂阴离子自组装而成，这些阴离子将可机械切换的四价阳离子与两微米宽的金属顶部电极隔离开来。由此产生的面积为0.002平方微米的隧道结可处理一排约2000个分子的纳米宽区域。有源和剩余电流-电压测量表明，这些器件在环境条件下可在高电流状态和低电流状态之间进行可重新配置的切换和反复循环。研究了包括简并[2]连环烷在内的对照化合物，以支持开关特征的机械起源。这些基于SWNT的MSTJs的工作方式与先前报道的基于硅的MSTJs类似，但与包含底部金属电极的类似器件不同。讨论了这些结果与分子电子器件电极材料选择的相关性。
